1611 lines
56 KiB
Python
1611 lines
56 KiB
Python
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# Python test set -- part 5, built-in exceptions
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import copy
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import gc
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import os
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import sys
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import unittest
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import pickle
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import weakref
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import errno
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from test.support import (TESTFN, captured_stderr, check_impl_detail,
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check_warnings, cpython_only, gc_collect,
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no_tracing, unlink, import_module, script_helper,
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SuppressCrashReport)
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from test import support
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class NaiveException(Exception):
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def __init__(self, x):
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self.x = x
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class SlottedNaiveException(Exception):
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__slots__ = ('x',)
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def __init__(self, x):
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self.x = x
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class BrokenStrException(Exception):
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def __str__(self):
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raise Exception("str() is broken")
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# XXX This is not really enough, each *operation* should be tested!
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class ExceptionTests(unittest.TestCase):
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def raise_catch(self, exc, excname):
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with self.subTest(exc=exc, excname=excname):
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try:
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raise exc("spam")
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except exc as err:
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buf1 = str(err)
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try:
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raise exc("spam")
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except exc as err:
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buf2 = str(err)
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self.assertEqual(buf1, buf2)
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self.assertEqual(exc.__name__, excname)
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def testRaising(self):
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self.raise_catch(AttributeError, "AttributeError")
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self.assertRaises(AttributeError, getattr, sys, "undefined_attribute")
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self.raise_catch(EOFError, "EOFError")
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fp = open(TESTFN, 'w')
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fp.close()
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fp = open(TESTFN, 'r')
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savestdin = sys.stdin
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try:
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try:
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import marshal
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marshal.loads(b'')
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except EOFError:
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pass
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finally:
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sys.stdin = savestdin
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fp.close()
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unlink(TESTFN)
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self.raise_catch(OSError, "OSError")
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self.assertRaises(OSError, open, 'this file does not exist', 'r')
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self.raise_catch(ImportError, "ImportError")
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self.assertRaises(ImportError, __import__, "undefined_module")
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self.raise_catch(IndexError, "IndexError")
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x = []
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self.assertRaises(IndexError, x.__getitem__, 10)
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self.raise_catch(KeyError, "KeyError")
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x = {}
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self.assertRaises(KeyError, x.__getitem__, 'key')
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self.raise_catch(KeyboardInterrupt, "KeyboardInterrupt")
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self.raise_catch(MemoryError, "MemoryError")
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self.raise_catch(NameError, "NameError")
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try: x = undefined_variable
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except NameError: pass
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self.raise_catch(OverflowError, "OverflowError")
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x = 1
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for dummy in range(128):
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x += x # this simply shouldn't blow up
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self.raise_catch(RuntimeError, "RuntimeError")
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self.raise_catch(RecursionError, "RecursionError")
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self.raise_catch(SyntaxError, "SyntaxError")
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try: exec('/\n')
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except SyntaxError: pass
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self.raise_catch(IndentationError, "IndentationError")
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self.raise_catch(TabError, "TabError")
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try: compile("try:\n\t1/0\n \t1/0\nfinally:\n pass\n",
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'<string>', 'exec')
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except TabError: pass
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else: self.fail("TabError not raised")
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self.raise_catch(SystemError, "SystemError")
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self.raise_catch(SystemExit, "SystemExit")
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self.assertRaises(SystemExit, sys.exit, 0)
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self.raise_catch(TypeError, "TypeError")
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try: [] + ()
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except TypeError: pass
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self.raise_catch(ValueError, "ValueError")
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self.assertRaises(ValueError, chr, 17<<16)
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self.raise_catch(ZeroDivisionError, "ZeroDivisionError")
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try: x = 1/0
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except ZeroDivisionError: pass
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self.raise_catch(Exception, "Exception")
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try: x = 1/0
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except Exception as e: pass
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self.raise_catch(StopAsyncIteration, "StopAsyncIteration")
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def testSyntaxErrorMessage(self):
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# make sure the right exception message is raised for each of
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# these code fragments
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def ckmsg(src, msg):
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with self.subTest(src=src, msg=msg):
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try:
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compile(src, '<fragment>', 'exec')
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except SyntaxError as e:
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if e.msg != msg:
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self.fail("expected %s, got %s" % (msg, e.msg))
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else:
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self.fail("failed to get expected SyntaxError")
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s = '''if 1:
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try:
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continue
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except:
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pass'''
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ckmsg(s, "'continue' not properly in loop")
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ckmsg("continue\n", "'continue' not properly in loop")
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def testSyntaxErrorMissingParens(self):
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def ckmsg(src, msg, exception=SyntaxError):
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try:
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compile(src, '<fragment>', 'exec')
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except exception as e:
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if e.msg != msg:
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self.fail("expected %s, got %s" % (msg, e.msg))
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else:
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self.fail("failed to get expected SyntaxError")
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s = '''print "old style"'''
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ckmsg(s, "Missing parentheses in call to 'print'. "
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"Did you mean print(\"old style\")?")
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s = '''print "old style",'''
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ckmsg(s, "Missing parentheses in call to 'print'. "
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"Did you mean print(\"old style\", end=\" \")?")
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s = '''exec "old style"'''
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ckmsg(s, "Missing parentheses in call to 'exec'")
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# should not apply to subclasses, see issue #31161
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s = '''if True:\nprint "No indent"'''
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ckmsg(s, "expected an indented block", IndentationError)
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s = '''if True:\n print()\n\texec "mixed tabs and spaces"'''
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ckmsg(s, "inconsistent use of tabs and spaces in indentation", TabError)
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def check(self, src, lineno, offset, encoding='utf-8'):
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with self.subTest(source=src, lineno=lineno, offset=offset):
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with self.assertRaises(SyntaxError) as cm:
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compile(src, '<fragment>', 'exec')
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self.assertEqual(cm.exception.lineno, lineno)
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self.assertEqual(cm.exception.offset, offset)
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if cm.exception.text is not None:
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if not isinstance(src, str):
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src = src.decode(encoding, 'replace')
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line = src.split('\n')[lineno-1]
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self.assertIn(line, cm.exception.text)
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def testSyntaxErrorOffset(self):
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check = self.check
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check('def fact(x):\n\treturn x!\n', 2, 10)
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check('1 +\n', 1, 4)
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check('def spam():\n print(1)\n print(2)', 3, 10)
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check('Python = "Python" +', 1, 20)
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check('Python = "\u1e54\xfd\u0163\u0125\xf2\xf1" +', 1, 20)
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check(b'# -*- coding: cp1251 -*-\nPython = "\xcf\xb3\xf2\xee\xed" +',
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2, 19, encoding='cp1251')
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check(b'Python = "\xcf\xb3\xf2\xee\xed" +', 1, 18)
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check('x = "a', 1, 7)
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check('lambda x: x = 2', 1, 1)
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check('f{a + b + c}', 1, 2)
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# Errors thrown by compile.c
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check('class foo:return 1', 1, 11)
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check('def f():\n continue', 2, 3)
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check('def f():\n break', 2, 3)
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check('try:\n pass\nexcept:\n pass\nexcept ValueError:\n pass', 2, 3)
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# Errors thrown by tokenizer.c
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check('(0x+1)', 1, 3)
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check('x = 0xI', 1, 6)
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check('0010 + 2', 1, 4)
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check('x = 32e-+4', 1, 8)
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check('x = 0o9', 1, 6)
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check('\u03b1 = 0xI', 1, 6)
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check(b'\xce\xb1 = 0xI', 1, 6)
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check(b'# -*- coding: iso8859-7 -*-\n\xe1 = 0xI', 2, 6,
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encoding='iso8859-7')
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check(b"""if 1:
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def foo():
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'''
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def bar():
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pass
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def baz():
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'''quux'''
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""", 9, 20)
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check("pass\npass\npass\n(1+)\npass\npass\npass", 4, 4)
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check("(1+)", 1, 4)
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check(b"\xef\xbb\xbf#coding: utf8\nprint('\xe6\x88\x91')\n", 0,
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0 if support.use_old_parser() else -1)
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# Errors thrown by symtable.c
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check('x = [(yield i) for i in range(3)]', 1, 5)
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check('def f():\n from _ import *', 1, 1)
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check('def f(x, x):\n pass', 1, 1)
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check('def f(x):\n nonlocal x', 2, 3)
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check('def f(x):\n x = 1\n global x', 3, 3)
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check('nonlocal x', 1, 1)
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check('def f():\n global x\n nonlocal x', 2, 3)
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# Errors thrown by future.c
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check('from __future__ import doesnt_exist', 1, 1)
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check('from __future__ import braces', 1, 1)
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check('x=1\nfrom __future__ import division', 2, 1)
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check('foo(1=2)', 1, 5)
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check('def f():\n x, y: int', 2, 3)
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check('[*x for x in xs]', 1, 2)
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check('foo(x for x in range(10), 100)', 1, 5)
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check('(yield i) = 2', 1, 1 if support.use_old_parser() else 2)
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check('def f(*):\n pass', 1, 7 if support.use_old_parser() else 8)
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check('for 1 in []: pass', 1, 5)
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@cpython_only
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def testSettingException(self):
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# test that setting an exception at the C level works even if the
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# exception object can't be constructed.
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class BadException(Exception):
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def __init__(self_):
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raise RuntimeError("can't instantiate BadException")
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class InvalidException:
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pass
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def test_capi1():
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import _testcapi
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try:
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_testcapi.raise_exception(BadException, 1)
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except TypeError as err:
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exc, err, tb = sys.exc_info()
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co = tb.tb_frame.f_code
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self.assertEqual(co.co_name, "test_capi1")
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self.assertTrue(co.co_filename.endswith('test_exceptions.py'))
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else:
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self.fail("Expected exception")
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def test_capi2():
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import _testcapi
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try:
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_testcapi.raise_exception(BadException, 0)
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except RuntimeError as err:
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exc, err, tb = sys.exc_info()
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co = tb.tb_frame.f_code
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self.assertEqual(co.co_name, "__init__")
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self.assertTrue(co.co_filename.endswith('test_exceptions.py'))
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co2 = tb.tb_frame.f_back.f_code
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self.assertEqual(co2.co_name, "test_capi2")
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else:
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self.fail("Expected exception")
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def test_capi3():
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import _testcapi
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self.assertRaises(SystemError, _testcapi.raise_exception,
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InvalidException, 1)
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if not sys.platform.startswith('java'):
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test_capi1()
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test_capi2()
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test_capi3()
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def test_WindowsError(self):
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try:
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WindowsError
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except NameError:
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pass
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else:
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self.assertIs(WindowsError, OSError)
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self.assertEqual(str(OSError(1001)), "1001")
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self.assertEqual(str(OSError(1001, "message")),
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"[Errno 1001] message")
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# POSIX errno (9 aka EBADF) is untranslated
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w = OSError(9, 'foo', 'bar')
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self.assertEqual(w.errno, 9)
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self.assertEqual(w.winerror, None)
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self.assertEqual(str(w), "[Errno 9] foo: 'bar'")
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# ERROR_PATH_NOT_FOUND (win error 3) becomes ENOENT (2)
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w = OSError(0, 'foo', 'bar', 3)
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self.assertEqual(w.errno, 2)
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self.assertEqual(w.winerror, 3)
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self.assertEqual(w.strerror, 'foo')
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self.assertEqual(w.filename, 'bar')
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self.assertEqual(w.filename2, None)
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self.assertEqual(str(w), "[WinError 3] foo: 'bar'")
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# Unknown win error becomes EINVAL (22)
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w = OSError(0, 'foo', None, 1001)
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self.assertEqual(w.errno, 22)
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self.assertEqual(w.winerror, 1001)
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self.assertEqual(w.strerror, 'foo')
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self.assertEqual(w.filename, None)
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self.assertEqual(w.filename2, None)
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self.assertEqual(str(w), "[WinError 1001] foo")
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# Non-numeric "errno"
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w = OSError('bar', 'foo')
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self.assertEqual(w.errno, 'bar')
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self.assertEqual(w.winerror, None)
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self.assertEqual(w.strerror, 'foo')
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self.assertEqual(w.filename, None)
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self.assertEqual(w.filename2, None)
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|
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@unittest.skipUnless(sys.platform == 'win32',
|
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|
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'test specific to Windows')
|
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|
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def test_windows_message(self):
|
||
|
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"""Should fill in unknown error code in Windows error message"""
|
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|
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ctypes = import_module('ctypes')
|
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|
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# this error code has no message, Python formats it as hexadecimal
|
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|
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code = 3765269347
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|
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with self.assertRaisesRegex(OSError, 'Windows Error 0x%x' % code):
|
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|
|
ctypes.pythonapi.PyErr_SetFromWindowsErr(code)
|
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|
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|
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def testAttributes(self):
|
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|
|
# test that exception attributes are happy
|
||
|
|
|
||
|
|
exceptionList = [
|
||
|
|
(BaseException, (), {'args' : ()}),
|
||
|
|
(BaseException, (1, ), {'args' : (1,)}),
|
||
|
|
(BaseException, ('foo',),
|
||
|
|
{'args' : ('foo',)}),
|
||
|
|
(BaseException, ('foo', 1),
|
||
|
|
{'args' : ('foo', 1)}),
|
||
|
|
(SystemExit, ('foo',),
|
||
|
|
{'args' : ('foo',), 'code' : 'foo'}),
|
||
|
|
(OSError, ('foo',),
|
||
|
|
{'args' : ('foo',), 'filename' : None, 'filename2' : None,
|
||
|
|
'errno' : None, 'strerror' : None}),
|
||
|
|
(OSError, ('foo', 'bar'),
|
||
|
|
{'args' : ('foo', 'bar'),
|
||
|
|
'filename' : None, 'filename2' : None,
|
||
|
|
'errno' : 'foo', 'strerror' : 'bar'}),
|
||
|
|
(OSError, ('foo', 'bar', 'baz'),
|
||
|
|
{'args' : ('foo', 'bar'),
|
||
|
|
'filename' : 'baz', 'filename2' : None,
|
||
|
|
'errno' : 'foo', 'strerror' : 'bar'}),
|
||
|
|
(OSError, ('foo', 'bar', 'baz', None, 'quux'),
|
||
|
|
{'args' : ('foo', 'bar'), 'filename' : 'baz', 'filename2': 'quux'}),
|
||
|
|
(OSError, ('errnoStr', 'strErrorStr', 'filenameStr'),
|
||
|
|
{'args' : ('errnoStr', 'strErrorStr'),
|
||
|
|
'strerror' : 'strErrorStr', 'errno' : 'errnoStr',
|
||
|
|
'filename' : 'filenameStr'}),
|
||
|
|
(OSError, (1, 'strErrorStr', 'filenameStr'),
|
||
|
|
{'args' : (1, 'strErrorStr'), 'errno' : 1,
|
||
|
|
'strerror' : 'strErrorStr',
|
||
|
|
'filename' : 'filenameStr', 'filename2' : None}),
|
||
|
|
(SyntaxError, (), {'msg' : None, 'text' : None,
|
||
|
|
'filename' : None, 'lineno' : None, 'offset' : None,
|
||
|
|
'print_file_and_line' : None}),
|
||
|
|
(SyntaxError, ('msgStr',),
|
||
|
|
{'args' : ('msgStr',), 'text' : None,
|
||
|
|
'print_file_and_line' : None, 'msg' : 'msgStr',
|
||
|
|
'filename' : None, 'lineno' : None, 'offset' : None}),
|
||
|
|
(SyntaxError, ('msgStr', ('filenameStr', 'linenoStr', 'offsetStr',
|
||
|
|
'textStr')),
|
||
|
|
{'offset' : 'offsetStr', 'text' : 'textStr',
|
||
|
|
'args' : ('msgStr', ('filenameStr', 'linenoStr',
|
||
|
|
'offsetStr', 'textStr')),
|
||
|
|
'print_file_and_line' : None, 'msg' : 'msgStr',
|
||
|
|
'filename' : 'filenameStr', 'lineno' : 'linenoStr'}),
|
||
|
|
(SyntaxError, ('msgStr', 'filenameStr', 'linenoStr', 'offsetStr',
|
||
|
|
'textStr', 'print_file_and_lineStr'),
|
||
|
|
{'text' : None,
|
||
|
|
'args' : ('msgStr', 'filenameStr', 'linenoStr', 'offsetStr',
|
||
|
|
'textStr', 'print_file_and_lineStr'),
|
||
|
|
'print_file_and_line' : None, 'msg' : 'msgStr',
|
||
|
|
'filename' : None, 'lineno' : None, 'offset' : None}),
|
||
|
|
(UnicodeError, (), {'args' : (),}),
|
||
|
|
(UnicodeEncodeError, ('ascii', 'a', 0, 1,
|
||
|
|
'ordinal not in range'),
|
||
|
|
{'args' : ('ascii', 'a', 0, 1,
|
||
|
|
'ordinal not in range'),
|
||
|
|
'encoding' : 'ascii', 'object' : 'a',
|
||
|
|
'start' : 0, 'reason' : 'ordinal not in range'}),
|
||
|
|
(UnicodeDecodeError, ('ascii', bytearray(b'\xff'), 0, 1,
|
||
|
|
'ordinal not in range'),
|
||
|
|
{'args' : ('ascii', bytearray(b'\xff'), 0, 1,
|
||
|
|
'ordinal not in range'),
|
||
|
|
'encoding' : 'ascii', 'object' : b'\xff',
|
||
|
|
'start' : 0, 'reason' : 'ordinal not in range'}),
|
||
|
|
(UnicodeDecodeError, ('ascii', b'\xff', 0, 1,
|
||
|
|
'ordinal not in range'),
|
||
|
|
{'args' : ('ascii', b'\xff', 0, 1,
|
||
|
|
'ordinal not in range'),
|
||
|
|
'encoding' : 'ascii', 'object' : b'\xff',
|
||
|
|
'start' : 0, 'reason' : 'ordinal not in range'}),
|
||
|
|
(UnicodeTranslateError, ("\u3042", 0, 1, "ouch"),
|
||
|
|
{'args' : ('\u3042', 0, 1, 'ouch'),
|
||
|
|
'object' : '\u3042', 'reason' : 'ouch',
|
||
|
|
'start' : 0, 'end' : 1}),
|
||
|
|
(NaiveException, ('foo',),
|
||
|
|
{'args': ('foo',), 'x': 'foo'}),
|
||
|
|
(SlottedNaiveException, ('foo',),
|
||
|
|
{'args': ('foo',), 'x': 'foo'}),
|
||
|
|
]
|
||
|
|
try:
|
||
|
|
# More tests are in test_WindowsError
|
||
|
|
exceptionList.append(
|
||
|
|
(WindowsError, (1, 'strErrorStr', 'filenameStr'),
|
||
|
|
{'args' : (1, 'strErrorStr'),
|
||
|
|
'strerror' : 'strErrorStr', 'winerror' : None,
|
||
|
|
'errno' : 1,
|
||
|
|
'filename' : 'filenameStr', 'filename2' : None})
|
||
|
|
)
|
||
|
|
except NameError:
|
||
|
|
pass
|
||
|
|
|
||
|
|
for exc, args, expected in exceptionList:
|
||
|
|
try:
|
||
|
|
e = exc(*args)
|
||
|
|
except:
|
||
|
|
print("\nexc=%r, args=%r" % (exc, args), file=sys.stderr)
|
||
|
|
raise
|
||
|
|
else:
|
||
|
|
# Verify module name
|
||
|
|
if not type(e).__name__.endswith('NaiveException'):
|
||
|
|
self.assertEqual(type(e).__module__, 'builtins')
|
||
|
|
# Verify no ref leaks in Exc_str()
|
||
|
|
s = str(e)
|
||
|
|
for checkArgName in expected:
|
||
|
|
value = getattr(e, checkArgName)
|
||
|
|
self.assertEqual(repr(value),
|
||
|
|
repr(expected[checkArgName]),
|
||
|
|
'%r.%s == %r, expected %r' % (
|
||
|
|
e, checkArgName,
|
||
|
|
value, expected[checkArgName]))
|
||
|
|
|
||
|
|
# test for pickling support
|
||
|
|
for p in [pickle]:
|
||
|
|
for protocol in range(p.HIGHEST_PROTOCOL + 1):
|
||
|
|
s = p.dumps(e, protocol)
|
||
|
|
new = p.loads(s)
|
||
|
|
for checkArgName in expected:
|
||
|
|
got = repr(getattr(new, checkArgName))
|
||
|
|
want = repr(expected[checkArgName])
|
||
|
|
self.assertEqual(got, want,
|
||
|
|
'pickled "%r", attribute "%s' %
|
||
|
|
(e, checkArgName))
|
||
|
|
|
||
|
|
def testWithTraceback(self):
|
||
|
|
try:
|
||
|
|
raise IndexError(4)
|
||
|
|
except:
|
||
|
|
tb = sys.exc_info()[2]
|
||
|
|
|
||
|
|
e = BaseException().with_traceback(tb)
|
||
|
|
self.assertIsInstance(e, BaseException)
|
||
|
|
self.assertEqual(e.__traceback__, tb)
|
||
|
|
|
||
|
|
e = IndexError(5).with_traceback(tb)
|
||
|
|
self.assertIsInstance(e, IndexError)
|
||
|
|
self.assertEqual(e.__traceback__, tb)
|
||
|
|
|
||
|
|
class MyException(Exception):
|
||
|
|
pass
|
||
|
|
|
||
|
|
e = MyException().with_traceback(tb)
|
||
|
|
self.assertIsInstance(e, MyException)
|
||
|
|
self.assertEqual(e.__traceback__, tb)
|
||
|
|
|
||
|
|
def testInvalidTraceback(self):
|
||
|
|
try:
|
||
|
|
Exception().__traceback__ = 5
|
||
|
|
except TypeError as e:
|
||
|
|
self.assertIn("__traceback__ must be a traceback", str(e))
|
||
|
|
else:
|
||
|
|
self.fail("No exception raised")
|
||
|
|
|
||
|
|
def testInvalidAttrs(self):
|
||
|
|
self.assertRaises(TypeError, setattr, Exception(), '__cause__', 1)
|
||
|
|
self.assertRaises(TypeError, delattr, Exception(), '__cause__')
|
||
|
|
self.assertRaises(TypeError, setattr, Exception(), '__context__', 1)
|
||
|
|
self.assertRaises(TypeError, delattr, Exception(), '__context__')
|
||
|
|
|
||
|
|
def testNoneClearsTracebackAttr(self):
|
||
|
|
try:
|
||
|
|
raise IndexError(4)
|
||
|
|
except:
|
||
|
|
tb = sys.exc_info()[2]
|
||
|
|
|
||
|
|
e = Exception()
|
||
|
|
e.__traceback__ = tb
|
||
|
|
e.__traceback__ = None
|
||
|
|
self.assertEqual(e.__traceback__, None)
|
||
|
|
|
||
|
|
def testChainingAttrs(self):
|
||
|
|
e = Exception()
|
||
|
|
self.assertIsNone(e.__context__)
|
||
|
|
self.assertIsNone(e.__cause__)
|
||
|
|
|
||
|
|
e = TypeError()
|
||
|
|
self.assertIsNone(e.__context__)
|
||
|
|
self.assertIsNone(e.__cause__)
|
||
|
|
|
||
|
|
class MyException(OSError):
|
||
|
|
pass
|
||
|
|
|
||
|
|
e = MyException()
|
||
|
|
self.assertIsNone(e.__context__)
|
||
|
|
self.assertIsNone(e.__cause__)
|
||
|
|
|
||
|
|
def testChainingDescriptors(self):
|
||
|
|
try:
|
||
|
|
raise Exception()
|
||
|
|
except Exception as exc:
|
||
|
|
e = exc
|
||
|
|
|
||
|
|
self.assertIsNone(e.__context__)
|
||
|
|
self.assertIsNone(e.__cause__)
|
||
|
|
self.assertFalse(e.__suppress_context__)
|
||
|
|
|
||
|
|
e.__context__ = NameError()
|
||
|
|
e.__cause__ = None
|
||
|
|
self.assertIsInstance(e.__context__, NameError)
|
||
|
|
self.assertIsNone(e.__cause__)
|
||
|
|
self.assertTrue(e.__suppress_context__)
|
||
|
|
e.__suppress_context__ = False
|
||
|
|
self.assertFalse(e.__suppress_context__)
|
||
|
|
|
||
|
|
def testKeywordArgs(self):
|
||
|
|
# test that builtin exception don't take keyword args,
|
||
|
|
# but user-defined subclasses can if they want
|
||
|
|
self.assertRaises(TypeError, BaseException, a=1)
|
||
|
|
|
||
|
|
class DerivedException(BaseException):
|
||
|
|
def __init__(self, fancy_arg):
|
||
|
|
BaseException.__init__(self)
|
||
|
|
self.fancy_arg = fancy_arg
|
||
|
|
|
||
|
|
x = DerivedException(fancy_arg=42)
|
||
|
|
self.assertEqual(x.fancy_arg, 42)
|
||
|
|
|
||
|
|
@no_tracing
|
||
|
|
def testInfiniteRecursion(self):
|
||
|
|
def f():
|
||
|
|
return f()
|
||
|
|
self.assertRaises(RecursionError, f)
|
||
|
|
|
||
|
|
def g():
|
||
|
|
try:
|
||
|
|
return g()
|
||
|
|
except ValueError:
|
||
|
|
return -1
|
||
|
|
self.assertRaises(RecursionError, g)
|
||
|
|
|
||
|
|
def test_str(self):
|
||
|
|
# Make sure both instances and classes have a str representation.
|
||
|
|
self.assertTrue(str(Exception))
|
||
|
|
self.assertTrue(str(Exception('a')))
|
||
|
|
self.assertTrue(str(Exception('a', 'b')))
|
||
|
|
|
||
|
|
def testExceptionCleanupNames(self):
|
||
|
|
# Make sure the local variable bound to the exception instance by
|
||
|
|
# an "except" statement is only visible inside the except block.
|
||
|
|
try:
|
||
|
|
raise Exception()
|
||
|
|
except Exception as e:
|
||
|
|
self.assertTrue(e)
|
||
|
|
del e
|
||
|
|
self.assertNotIn('e', locals())
|
||
|
|
|
||
|
|
def testExceptionCleanupState(self):
|
||
|
|
# Make sure exception state is cleaned up as soon as the except
|
||
|
|
# block is left. See #2507
|
||
|
|
|
||
|
|
class MyException(Exception):
|
||
|
|
def __init__(self, obj):
|
||
|
|
self.obj = obj
|
||
|
|
class MyObj:
|
||
|
|
pass
|
||
|
|
|
||
|
|
def inner_raising_func():
|
||
|
|
# Create some references in exception value and traceback
|
||
|
|
local_ref = obj
|
||
|
|
raise MyException(obj)
|
||
|
|
|
||
|
|
# Qualified "except" with "as"
|
||
|
|
obj = MyObj()
|
||
|
|
wr = weakref.ref(obj)
|
||
|
|
try:
|
||
|
|
inner_raising_func()
|
||
|
|
except MyException as e:
|
||
|
|
pass
|
||
|
|
obj = None
|
||
|
|
gc_collect() # For PyPy or other GCs.
|
||
|
|
obj = wr()
|
||
|
|
self.assertIsNone(obj)
|
||
|
|
|
||
|
|
# Qualified "except" without "as"
|
||
|
|
obj = MyObj()
|
||
|
|
wr = weakref.ref(obj)
|
||
|
|
try:
|
||
|
|
inner_raising_func()
|
||
|
|
except MyException:
|
||
|
|
pass
|
||
|
|
obj = None
|
||
|
|
gc_collect() # For PyPy or other GCs.
|
||
|
|
obj = wr()
|
||
|
|
self.assertIsNone(obj)
|
||
|
|
|
||
|
|
# Bare "except"
|
||
|
|
obj = MyObj()
|
||
|
|
wr = weakref.ref(obj)
|
||
|
|
try:
|
||
|
|
inner_raising_func()
|
||
|
|
except:
|
||
|
|
pass
|
||
|
|
obj = None
|
||
|
|
gc_collect() # For PyPy or other GCs.
|
||
|
|
obj = wr()
|
||
|
|
self.assertIsNone(obj)
|
||
|
|
|
||
|
|
# "except" with premature block leave
|
||
|
|
obj = MyObj()
|
||
|
|
wr = weakref.ref(obj)
|
||
|
|
for i in [0]:
|
||
|
|
try:
|
||
|
|
inner_raising_func()
|
||
|
|
except:
|
||
|
|
break
|
||
|
|
obj = None
|
||
|
|
gc_collect() # For PyPy or other GCs.
|
||
|
|
obj = wr()
|
||
|
|
self.assertIsNone(obj)
|
||
|
|
|
||
|
|
# "except" block raising another exception
|
||
|
|
obj = MyObj()
|
||
|
|
wr = weakref.ref(obj)
|
||
|
|
try:
|
||
|
|
try:
|
||
|
|
inner_raising_func()
|
||
|
|
except:
|
||
|
|
raise KeyError
|
||
|
|
except KeyError as e:
|
||
|
|
# We want to test that the except block above got rid of
|
||
|
|
# the exception raised in inner_raising_func(), but it
|
||
|
|
# also ends up in the __context__ of the KeyError, so we
|
||
|
|
# must clear the latter manually for our test to succeed.
|
||
|
|
e.__context__ = None
|
||
|
|
obj = None
|
||
|
|
gc_collect() # For PyPy or other GCs.
|
||
|
|
obj = wr()
|
||
|
|
# guarantee no ref cycles on CPython (don't gc_collect)
|
||
|
|
if check_impl_detail(cpython=False):
|
||
|
|
gc_collect()
|
||
|
|
self.assertIsNone(obj)
|
||
|
|
|
||
|
|
# Some complicated construct
|
||
|
|
obj = MyObj()
|
||
|
|
wr = weakref.ref(obj)
|
||
|
|
try:
|
||
|
|
inner_raising_func()
|
||
|
|
except MyException:
|
||
|
|
try:
|
||
|
|
try:
|
||
|
|
raise
|
||
|
|
finally:
|
||
|
|
raise
|
||
|
|
except MyException:
|
||
|
|
pass
|
||
|
|
obj = None
|
||
|
|
if check_impl_detail(cpython=False):
|
||
|
|
gc_collect()
|
||
|
|
obj = wr()
|
||
|
|
self.assertIsNone(obj)
|
||
|
|
|
||
|
|
# Inside an exception-silencing "with" block
|
||
|
|
class Context:
|
||
|
|
def __enter__(self):
|
||
|
|
return self
|
||
|
|
def __exit__ (self, exc_type, exc_value, exc_tb):
|
||
|
|
return True
|
||
|
|
obj = MyObj()
|
||
|
|
wr = weakref.ref(obj)
|
||
|
|
with Context():
|
||
|
|
inner_raising_func()
|
||
|
|
obj = None
|
||
|
|
if check_impl_detail(cpython=False):
|
||
|
|
gc_collect()
|
||
|
|
obj = wr()
|
||
|
|
self.assertIsNone(obj)
|
||
|
|
|
||
|
|
def test_exception_target_in_nested_scope(self):
|
||
|
|
# issue 4617: This used to raise a SyntaxError
|
||
|
|
# "can not delete variable 'e' referenced in nested scope"
|
||
|
|
def print_error():
|
||
|
|
e
|
||
|
|
try:
|
||
|
|
something
|
||
|
|
except Exception as e:
|
||
|
|
print_error()
|
||
|
|
# implicit "del e" here
|
||
|
|
|
||
|
|
def test_generator_leaking(self):
|
||
|
|
# Test that generator exception state doesn't leak into the calling
|
||
|
|
# frame
|
||
|
|
def yield_raise():
|
||
|
|
try:
|
||
|
|
raise KeyError("caught")
|
||
|
|
except KeyError:
|
||
|
|
yield sys.exc_info()[0]
|
||
|
|
yield sys.exc_info()[0]
|
||
|
|
yield sys.exc_info()[0]
|
||
|
|
g = yield_raise()
|
||
|
|
self.assertEqual(next(g), KeyError)
|
||
|
|
self.assertEqual(sys.exc_info()[0], None)
|
||
|
|
self.assertEqual(next(g), KeyError)
|
||
|
|
self.assertEqual(sys.exc_info()[0], None)
|
||
|
|
self.assertEqual(next(g), None)
|
||
|
|
|
||
|
|
# Same test, but inside an exception handler
|
||
|
|
try:
|
||
|
|
raise TypeError("foo")
|
||
|
|
except TypeError:
|
||
|
|
g = yield_raise()
|
||
|
|
self.assertEqual(next(g), KeyError)
|
||
|
|
self.assertEqual(sys.exc_info()[0], TypeError)
|
||
|
|
self.assertEqual(next(g), KeyError)
|
||
|
|
self.assertEqual(sys.exc_info()[0], TypeError)
|
||
|
|
self.assertEqual(next(g), TypeError)
|
||
|
|
del g
|
||
|
|
self.assertEqual(sys.exc_info()[0], TypeError)
|
||
|
|
|
||
|
|
def test_generator_leaking2(self):
|
||
|
|
# See issue 12475.
|
||
|
|
def g():
|
||
|
|
yield
|
||
|
|
try:
|
||
|
|
raise RuntimeError
|
||
|
|
except RuntimeError:
|
||
|
|
it = g()
|
||
|
|
next(it)
|
||
|
|
try:
|
||
|
|
next(it)
|
||
|
|
except StopIteration:
|
||
|
|
pass
|
||
|
|
self.assertEqual(sys.exc_info(), (None, None, None))
|
||
|
|
|
||
|
|
def test_generator_leaking3(self):
|
||
|
|
# See issue #23353. When gen.throw() is called, the caller's
|
||
|
|
# exception state should be save and restored.
|
||
|
|
def g():
|
||
|
|
try:
|
||
|
|
yield
|
||
|
|
except ZeroDivisionError:
|
||
|
|
yield sys.exc_info()[1]
|
||
|
|
it = g()
|
||
|
|
next(it)
|
||
|
|
try:
|
||
|
|
1/0
|
||
|
|
except ZeroDivisionError as e:
|
||
|
|
self.assertIs(sys.exc_info()[1], e)
|
||
|
|
gen_exc = it.throw(e)
|
||
|
|
self.assertIs(sys.exc_info()[1], e)
|
||
|
|
self.assertIs(gen_exc, e)
|
||
|
|
self.assertEqual(sys.exc_info(), (None, None, None))
|
||
|
|
|
||
|
|
def test_generator_leaking4(self):
|
||
|
|
# See issue #23353. When an exception is raised by a generator,
|
||
|
|
# the caller's exception state should still be restored.
|
||
|
|
def g():
|
||
|
|
try:
|
||
|
|
1/0
|
||
|
|
except ZeroDivisionError:
|
||
|
|
yield sys.exc_info()[0]
|
||
|
|
raise
|
||
|
|
it = g()
|
||
|
|
try:
|
||
|
|
raise TypeError
|
||
|
|
except TypeError:
|
||
|
|
# The caller's exception state (TypeError) is temporarily
|
||
|
|
# saved in the generator.
|
||
|
|
tp = next(it)
|
||
|
|
self.assertIs(tp, ZeroDivisionError)
|
||
|
|
try:
|
||
|
|
next(it)
|
||
|
|
# We can't check it immediately, but while next() returns
|
||
|
|
# with an exception, it shouldn't have restored the old
|
||
|
|
# exception state (TypeError).
|
||
|
|
except ZeroDivisionError as e:
|
||
|
|
self.assertIs(sys.exc_info()[1], e)
|
||
|
|
# We used to find TypeError here.
|
||
|
|
self.assertEqual(sys.exc_info(), (None, None, None))
|
||
|
|
|
||
|
|
def test_generator_doesnt_retain_old_exc(self):
|
||
|
|
def g():
|
||
|
|
self.assertIsInstance(sys.exc_info()[1], RuntimeError)
|
||
|
|
yield
|
||
|
|
self.assertEqual(sys.exc_info(), (None, None, None))
|
||
|
|
it = g()
|
||
|
|
try:
|
||
|
|
raise RuntimeError
|
||
|
|
except RuntimeError:
|
||
|
|
next(it)
|
||
|
|
self.assertRaises(StopIteration, next, it)
|
||
|
|
|
||
|
|
def test_generator_finalizing_and_exc_info(self):
|
||
|
|
# See #7173
|
||
|
|
def simple_gen():
|
||
|
|
yield 1
|
||
|
|
def run_gen():
|
||
|
|
gen = simple_gen()
|
||
|
|
try:
|
||
|
|
raise RuntimeError
|
||
|
|
except RuntimeError:
|
||
|
|
return next(gen)
|
||
|
|
run_gen()
|
||
|
|
gc_collect()
|
||
|
|
self.assertEqual(sys.exc_info(), (None, None, None))
|
||
|
|
|
||
|
|
def _check_generator_cleanup_exc_state(self, testfunc):
|
||
|
|
# Issue #12791: exception state is cleaned up as soon as a generator
|
||
|
|
# is closed (reference cycles are broken).
|
||
|
|
class MyException(Exception):
|
||
|
|
def __init__(self, obj):
|
||
|
|
self.obj = obj
|
||
|
|
class MyObj:
|
||
|
|
pass
|
||
|
|
|
||
|
|
def raising_gen():
|
||
|
|
try:
|
||
|
|
raise MyException(obj)
|
||
|
|
except MyException:
|
||
|
|
yield
|
||
|
|
|
||
|
|
obj = MyObj()
|
||
|
|
wr = weakref.ref(obj)
|
||
|
|
g = raising_gen()
|
||
|
|
next(g)
|
||
|
|
testfunc(g)
|
||
|
|
g = obj = None
|
||
|
|
gc_collect() # For PyPy or other GCs.
|
||
|
|
obj = wr()
|
||
|
|
self.assertIsNone(obj)
|
||
|
|
|
||
|
|
def test_generator_throw_cleanup_exc_state(self):
|
||
|
|
def do_throw(g):
|
||
|
|
try:
|
||
|
|
g.throw(RuntimeError())
|
||
|
|
except RuntimeError:
|
||
|
|
pass
|
||
|
|
self._check_generator_cleanup_exc_state(do_throw)
|
||
|
|
|
||
|
|
def test_generator_close_cleanup_exc_state(self):
|
||
|
|
def do_close(g):
|
||
|
|
g.close()
|
||
|
|
self._check_generator_cleanup_exc_state(do_close)
|
||
|
|
|
||
|
|
def test_generator_del_cleanup_exc_state(self):
|
||
|
|
def do_del(g):
|
||
|
|
g = None
|
||
|
|
self._check_generator_cleanup_exc_state(do_del)
|
||
|
|
|
||
|
|
def test_generator_next_cleanup_exc_state(self):
|
||
|
|
def do_next(g):
|
||
|
|
try:
|
||
|
|
next(g)
|
||
|
|
except StopIteration:
|
||
|
|
pass
|
||
|
|
else:
|
||
|
|
self.fail("should have raised StopIteration")
|
||
|
|
self._check_generator_cleanup_exc_state(do_next)
|
||
|
|
|
||
|
|
def test_generator_send_cleanup_exc_state(self):
|
||
|
|
def do_send(g):
|
||
|
|
try:
|
||
|
|
g.send(None)
|
||
|
|
except StopIteration:
|
||
|
|
pass
|
||
|
|
else:
|
||
|
|
self.fail("should have raised StopIteration")
|
||
|
|
self._check_generator_cleanup_exc_state(do_send)
|
||
|
|
|
||
|
|
def test_3114(self):
|
||
|
|
# Bug #3114: in its destructor, MyObject retrieves a pointer to
|
||
|
|
# obsolete and/or deallocated objects.
|
||
|
|
class MyObject:
|
||
|
|
def __del__(self):
|
||
|
|
nonlocal e
|
||
|
|
e = sys.exc_info()
|
||
|
|
e = ()
|
||
|
|
try:
|
||
|
|
raise Exception(MyObject())
|
||
|
|
except:
|
||
|
|
pass
|
||
|
|
gc_collect() # For PyPy or other GCs.
|
||
|
|
self.assertEqual(e, (None, None, None))
|
||
|
|
|
||
|
|
def test_raise_does_not_create_context_chain_cycle(self):
|
||
|
|
class A(Exception):
|
||
|
|
pass
|
||
|
|
class B(Exception):
|
||
|
|
pass
|
||
|
|
class C(Exception):
|
||
|
|
pass
|
||
|
|
|
||
|
|
# Create a context chain:
|
||
|
|
# C -> B -> A
|
||
|
|
# Then raise A in context of C.
|
||
|
|
try:
|
||
|
|
try:
|
||
|
|
raise A
|
||
|
|
except A as a_:
|
||
|
|
a = a_
|
||
|
|
try:
|
||
|
|
raise B
|
||
|
|
except B as b_:
|
||
|
|
b = b_
|
||
|
|
try:
|
||
|
|
raise C
|
||
|
|
except C as c_:
|
||
|
|
c = c_
|
||
|
|
self.assertIsInstance(a, A)
|
||
|
|
self.assertIsInstance(b, B)
|
||
|
|
self.assertIsInstance(c, C)
|
||
|
|
self.assertIsNone(a.__context__)
|
||
|
|
self.assertIs(b.__context__, a)
|
||
|
|
self.assertIs(c.__context__, b)
|
||
|
|
raise a
|
||
|
|
except A as e:
|
||
|
|
exc = e
|
||
|
|
|
||
|
|
# Expect A -> C -> B, without cycle
|
||
|
|
self.assertIs(exc, a)
|
||
|
|
self.assertIs(a.__context__, c)
|
||
|
|
self.assertIs(c.__context__, b)
|
||
|
|
self.assertIsNone(b.__context__)
|
||
|
|
|
||
|
|
def test_no_hang_on_context_chain_cycle1(self):
|
||
|
|
# See issue 25782. Cycle in context chain.
|
||
|
|
|
||
|
|
def cycle():
|
||
|
|
try:
|
||
|
|
raise ValueError(1)
|
||
|
|
except ValueError as ex:
|
||
|
|
ex.__context__ = ex
|
||
|
|
raise TypeError(2)
|
||
|
|
|
||
|
|
try:
|
||
|
|
cycle()
|
||
|
|
except Exception as e:
|
||
|
|
exc = e
|
||
|
|
|
||
|
|
self.assertIsInstance(exc, TypeError)
|
||
|
|
self.assertIsInstance(exc.__context__, ValueError)
|
||
|
|
self.assertIs(exc.__context__.__context__, exc.__context__)
|
||
|
|
|
||
|
|
def test_no_hang_on_context_chain_cycle2(self):
|
||
|
|
# See issue 25782. Cycle at head of context chain.
|
||
|
|
|
||
|
|
class A(Exception):
|
||
|
|
pass
|
||
|
|
class B(Exception):
|
||
|
|
pass
|
||
|
|
class C(Exception):
|
||
|
|
pass
|
||
|
|
|
||
|
|
# Context cycle:
|
||
|
|
# +-----------+
|
||
|
|
# V |
|
||
|
|
# C --> B --> A
|
||
|
|
with self.assertRaises(C) as cm:
|
||
|
|
try:
|
||
|
|
raise A()
|
||
|
|
except A as _a:
|
||
|
|
a = _a
|
||
|
|
try:
|
||
|
|
raise B()
|
||
|
|
except B as _b:
|
||
|
|
b = _b
|
||
|
|
try:
|
||
|
|
raise C()
|
||
|
|
except C as _c:
|
||
|
|
c = _c
|
||
|
|
a.__context__ = c
|
||
|
|
raise c
|
||
|
|
|
||
|
|
self.assertIs(cm.exception, c)
|
||
|
|
# Verify the expected context chain cycle
|
||
|
|
self.assertIs(c.__context__, b)
|
||
|
|
self.assertIs(b.__context__, a)
|
||
|
|
self.assertIs(a.__context__, c)
|
||
|
|
|
||
|
|
def test_no_hang_on_context_chain_cycle3(self):
|
||
|
|
# See issue 25782. Longer context chain with cycle.
|
||
|
|
|
||
|
|
class A(Exception):
|
||
|
|
pass
|
||
|
|
class B(Exception):
|
||
|
|
pass
|
||
|
|
class C(Exception):
|
||
|
|
pass
|
||
|
|
class D(Exception):
|
||
|
|
pass
|
||
|
|
class E(Exception):
|
||
|
|
pass
|
||
|
|
|
||
|
|
# Context cycle:
|
||
|
|
# +-----------+
|
||
|
|
# V |
|
||
|
|
# E --> D --> C --> B --> A
|
||
|
|
with self.assertRaises(E) as cm:
|
||
|
|
try:
|
||
|
|
raise A()
|
||
|
|
except A as _a:
|
||
|
|
a = _a
|
||
|
|
try:
|
||
|
|
raise B()
|
||
|
|
except B as _b:
|
||
|
|
b = _b
|
||
|
|
try:
|
||
|
|
raise C()
|
||
|
|
except C as _c:
|
||
|
|
c = _c
|
||
|
|
a.__context__ = c
|
||
|
|
try:
|
||
|
|
raise D()
|
||
|
|
except D as _d:
|
||
|
|
d = _d
|
||
|
|
e = E()
|
||
|
|
raise e
|
||
|
|
|
||
|
|
self.assertIs(cm.exception, e)
|
||
|
|
# Verify the expected context chain cycle
|
||
|
|
self.assertIs(e.__context__, d)
|
||
|
|
self.assertIs(d.__context__, c)
|
||
|
|
self.assertIs(c.__context__, b)
|
||
|
|
self.assertIs(b.__context__, a)
|
||
|
|
self.assertIs(a.__context__, c)
|
||
|
|
|
||
|
|
def test_unicode_change_attributes(self):
|
||
|
|
# See issue 7309. This was a crasher.
|
||
|
|
|
||
|
|
u = UnicodeEncodeError('baz', 'xxxxx', 1, 5, 'foo')
|
||
|
|
self.assertEqual(str(u), "'baz' codec can't encode characters in position 1-4: foo")
|
||
|
|
u.end = 2
|
||
|
|
self.assertEqual(str(u), "'baz' codec can't encode character '\\x78' in position 1: foo")
|
||
|
|
u.end = 5
|
||
|
|
u.reason = 0x345345345345345345
|
||
|
|
self.assertEqual(str(u), "'baz' codec can't encode characters in position 1-4: 965230951443685724997")
|
||
|
|
u.encoding = 4000
|
||
|
|
self.assertEqual(str(u), "'4000' codec can't encode characters in position 1-4: 965230951443685724997")
|
||
|
|
u.start = 1000
|
||
|
|
self.assertEqual(str(u), "'4000' codec can't encode characters in position 1000-4: 965230951443685724997")
|
||
|
|
|
||
|
|
u = UnicodeDecodeError('baz', b'xxxxx', 1, 5, 'foo')
|
||
|
|
self.assertEqual(str(u), "'baz' codec can't decode bytes in position 1-4: foo")
|
||
|
|
u.end = 2
|
||
|
|
self.assertEqual(str(u), "'baz' codec can't decode byte 0x78 in position 1: foo")
|
||
|
|
u.end = 5
|
||
|
|
u.reason = 0x345345345345345345
|
||
|
|
self.assertEqual(str(u), "'baz' codec can't decode bytes in position 1-4: 965230951443685724997")
|
||
|
|
u.encoding = 4000
|
||
|
|
self.assertEqual(str(u), "'4000' codec can't decode bytes in position 1-4: 965230951443685724997")
|
||
|
|
u.start = 1000
|
||
|
|
self.assertEqual(str(u), "'4000' codec can't decode bytes in position 1000-4: 965230951443685724997")
|
||
|
|
|
||
|
|
u = UnicodeTranslateError('xxxx', 1, 5, 'foo')
|
||
|
|
self.assertEqual(str(u), "can't translate characters in position 1-4: foo")
|
||
|
|
u.end = 2
|
||
|
|
self.assertEqual(str(u), "can't translate character '\\x78' in position 1: foo")
|
||
|
|
u.end = 5
|
||
|
|
u.reason = 0x345345345345345345
|
||
|
|
self.assertEqual(str(u), "can't translate characters in position 1-4: 965230951443685724997")
|
||
|
|
u.start = 1000
|
||
|
|
self.assertEqual(str(u), "can't translate characters in position 1000-4: 965230951443685724997")
|
||
|
|
|
||
|
|
def test_unicode_errors_no_object(self):
|
||
|
|
# See issue #21134.
|
||
|
|
klasses = UnicodeEncodeError, UnicodeDecodeError, UnicodeTranslateError
|
||
|
|
for klass in klasses:
|
||
|
|
self.assertEqual(str(klass.__new__(klass)), "")
|
||
|
|
|
||
|
|
@no_tracing
|
||
|
|
def test_badisinstance(self):
|
||
|
|
# Bug #2542: if issubclass(e, MyException) raises an exception,
|
||
|
|
# it should be ignored
|
||
|
|
class Meta(type):
|
||
|
|
def __subclasscheck__(cls, subclass):
|
||
|
|
raise ValueError()
|
||
|
|
class MyException(Exception, metaclass=Meta):
|
||
|
|
pass
|
||
|
|
|
||
|
|
with captured_stderr() as stderr:
|
||
|
|
try:
|
||
|
|
raise KeyError()
|
||
|
|
except MyException as e:
|
||
|
|
self.fail("exception should not be a MyException")
|
||
|
|
except KeyError:
|
||
|
|
pass
|
||
|
|
except:
|
||
|
|
self.fail("Should have raised KeyError")
|
||
|
|
else:
|
||
|
|
self.fail("Should have raised KeyError")
|
||
|
|
|
||
|
|
def g():
|
||
|
|
try:
|
||
|
|
return g()
|
||
|
|
except RecursionError:
|
||
|
|
return sys.exc_info()
|
||
|
|
e, v, tb = g()
|
||
|
|
self.assertIsInstance(v, RecursionError, type(v))
|
||
|
|
self.assertIn("maximum recursion depth exceeded", str(v))
|
||
|
|
|
||
|
|
|
||
|
|
@cpython_only
|
||
|
|
def test_trashcan_recursion(self):
|
||
|
|
# See bpo-33930
|
||
|
|
|
||
|
|
def foo():
|
||
|
|
o = object()
|
||
|
|
for x in range(1_000_000):
|
||
|
|
# Create a big chain of method objects that will trigger
|
||
|
|
# a deep chain of calls when they need to be destructed.
|
||
|
|
o = o.__dir__
|
||
|
|
|
||
|
|
foo()
|
||
|
|
support.gc_collect()
|
||
|
|
|
||
|
|
@cpython_only
|
||
|
|
def test_recursion_normalizing_exception(self):
|
||
|
|
# Issue #22898.
|
||
|
|
# Test that a RecursionError is raised when tstate->recursion_depth is
|
||
|
|
# equal to recursion_limit in PyErr_NormalizeException() and check
|
||
|
|
# that a ResourceWarning is printed.
|
||
|
|
# Prior to #22898, the recursivity of PyErr_NormalizeException() was
|
||
|
|
# controlled by tstate->recursion_depth and a PyExc_RecursionErrorInst
|
||
|
|
# singleton was being used in that case, that held traceback data and
|
||
|
|
# locals indefinitely and would cause a segfault in _PyExc_Fini() upon
|
||
|
|
# finalization of these locals.
|
||
|
|
code = """if 1:
|
||
|
|
import sys
|
||
|
|
from _testinternalcapi import get_recursion_depth
|
||
|
|
|
||
|
|
class MyException(Exception): pass
|
||
|
|
|
||
|
|
def setrecursionlimit(depth):
|
||
|
|
while 1:
|
||
|
|
try:
|
||
|
|
sys.setrecursionlimit(depth)
|
||
|
|
return depth
|
||
|
|
except RecursionError:
|
||
|
|
# sys.setrecursionlimit() raises a RecursionError if
|
||
|
|
# the new recursion limit is too low (issue #25274).
|
||
|
|
depth += 1
|
||
|
|
|
||
|
|
def recurse(cnt):
|
||
|
|
cnt -= 1
|
||
|
|
if cnt:
|
||
|
|
recurse(cnt)
|
||
|
|
else:
|
||
|
|
generator.throw(MyException)
|
||
|
|
|
||
|
|
def gen():
|
||
|
|
f = open(%a, mode='rb', buffering=0)
|
||
|
|
yield
|
||
|
|
|
||
|
|
generator = gen()
|
||
|
|
next(generator)
|
||
|
|
recursionlimit = sys.getrecursionlimit()
|
||
|
|
depth = get_recursion_depth()
|
||
|
|
try:
|
||
|
|
# Upon the last recursive invocation of recurse(),
|
||
|
|
# tstate->recursion_depth is equal to (recursion_limit - 1)
|
||
|
|
# and is equal to recursion_limit when _gen_throw() calls
|
||
|
|
# PyErr_NormalizeException().
|
||
|
|
recurse(setrecursionlimit(depth + 2) - depth - 1)
|
||
|
|
finally:
|
||
|
|
sys.setrecursionlimit(recursionlimit)
|
||
|
|
print('Done.')
|
||
|
|
""" % __file__
|
||
|
|
rc, out, err = script_helper.assert_python_failure("-Wd", "-c", code)
|
||
|
|
# Check that the program does not fail with SIGABRT.
|
||
|
|
self.assertEqual(rc, 1)
|
||
|
|
self.assertIn(b'RecursionError', err)
|
||
|
|
self.assertIn(b'ResourceWarning', err)
|
||
|
|
self.assertIn(b'Done.', out)
|
||
|
|
|
||
|
|
@cpython_only
|
||
|
|
def test_recursion_normalizing_infinite_exception(self):
|
||
|
|
# Issue #30697. Test that a RecursionError is raised when
|
||
|
|
# PyErr_NormalizeException() maximum recursion depth has been
|
||
|
|
# exceeded.
|
||
|
|
code = """if 1:
|
||
|
|
import _testcapi
|
||
|
|
try:
|
||
|
|
raise _testcapi.RecursingInfinitelyError
|
||
|
|
finally:
|
||
|
|
print('Done.')
|
||
|
|
"""
|
||
|
|
rc, out, err = script_helper.assert_python_failure("-c", code)
|
||
|
|
self.assertEqual(rc, 1)
|
||
|
|
self.assertIn(b'RecursionError: maximum recursion depth exceeded '
|
||
|
|
b'while normalizing an exception', err)
|
||
|
|
self.assertIn(b'Done.', out)
|
||
|
|
|
||
|
|
@cpython_only
|
||
|
|
def test_recursion_normalizing_with_no_memory(self):
|
||
|
|
# Issue #30697. Test that in the abort that occurs when there is no
|
||
|
|
# memory left and the size of the Python frames stack is greater than
|
||
|
|
# the size of the list of preallocated MemoryError instances, the
|
||
|
|
# Fatal Python error message mentions MemoryError.
|
||
|
|
code = """if 1:
|
||
|
|
import _testcapi
|
||
|
|
class C(): pass
|
||
|
|
def recurse(cnt):
|
||
|
|
cnt -= 1
|
||
|
|
if cnt:
|
||
|
|
recurse(cnt)
|
||
|
|
else:
|
||
|
|
_testcapi.set_nomemory(0)
|
||
|
|
C()
|
||
|
|
recurse(16)
|
||
|
|
"""
|
||
|
|
with SuppressCrashReport():
|
||
|
|
rc, out, err = script_helper.assert_python_failure("-c", code)
|
||
|
|
self.assertIn(b'Fatal Python error: _PyErr_NormalizeException: '
|
||
|
|
b'Cannot recover from MemoryErrors while '
|
||
|
|
b'normalizing exceptions.', err)
|
||
|
|
|
||
|
|
@cpython_only
|
||
|
|
def test_MemoryError(self):
|
||
|
|
# PyErr_NoMemory always raises the same exception instance.
|
||
|
|
# Check that the traceback is not doubled.
|
||
|
|
import traceback
|
||
|
|
from _testcapi import raise_memoryerror
|
||
|
|
def raiseMemError():
|
||
|
|
try:
|
||
|
|
raise_memoryerror()
|
||
|
|
except MemoryError as e:
|
||
|
|
tb = e.__traceback__
|
||
|
|
else:
|
||
|
|
self.fail("Should have raises a MemoryError")
|
||
|
|
return traceback.format_tb(tb)
|
||
|
|
|
||
|
|
tb1 = raiseMemError()
|
||
|
|
tb2 = raiseMemError()
|
||
|
|
self.assertEqual(tb1, tb2)
|
||
|
|
|
||
|
|
@cpython_only
|
||
|
|
def test_exception_with_doc(self):
|
||
|
|
import _testcapi
|
||
|
|
doc2 = "This is a test docstring."
|
||
|
|
doc4 = "This is another test docstring."
|
||
|
|
|
||
|
|
self.assertRaises(SystemError, _testcapi.make_exception_with_doc,
|
||
|
|
"error1")
|
||
|
|
|
||
|
|
# test basic usage of PyErr_NewException
|
||
|
|
error1 = _testcapi.make_exception_with_doc("_testcapi.error1")
|
||
|
|
self.assertIs(type(error1), type)
|
||
|
|
self.assertTrue(issubclass(error1, Exception))
|
||
|
|
self.assertIsNone(error1.__doc__)
|
||
|
|
|
||
|
|
# test with given docstring
|
||
|
|
error2 = _testcapi.make_exception_with_doc("_testcapi.error2", doc2)
|
||
|
|
self.assertEqual(error2.__doc__, doc2)
|
||
|
|
|
||
|
|
# test with explicit base (without docstring)
|
||
|
|
error3 = _testcapi.make_exception_with_doc("_testcapi.error3",
|
||
|
|
base=error2)
|
||
|
|
self.assertTrue(issubclass(error3, error2))
|
||
|
|
|
||
|
|
# test with explicit base tuple
|
||
|
|
class C(object):
|
||
|
|
pass
|
||
|
|
error4 = _testcapi.make_exception_with_doc("_testcapi.error4", doc4,
|
||
|
|
(error3, C))
|
||
|
|
self.assertTrue(issubclass(error4, error3))
|
||
|
|
self.assertTrue(issubclass(error4, C))
|
||
|
|
self.assertEqual(error4.__doc__, doc4)
|
||
|
|
|
||
|
|
# test with explicit dictionary
|
||
|
|
error5 = _testcapi.make_exception_with_doc("_testcapi.error5", "",
|
||
|
|
error4, {'a': 1})
|
||
|
|
self.assertTrue(issubclass(error5, error4))
|
||
|
|
self.assertEqual(error5.a, 1)
|
||
|
|
self.assertEqual(error5.__doc__, "")
|
||
|
|
|
||
|
|
@cpython_only
|
||
|
|
def test_memory_error_cleanup(self):
|
||
|
|
# Issue #5437: preallocated MemoryError instances should not keep
|
||
|
|
# traceback objects alive.
|
||
|
|
from _testcapi import raise_memoryerror
|
||
|
|
class C:
|
||
|
|
pass
|
||
|
|
wr = None
|
||
|
|
def inner():
|
||
|
|
nonlocal wr
|
||
|
|
c = C()
|
||
|
|
wr = weakref.ref(c)
|
||
|
|
raise_memoryerror()
|
||
|
|
# We cannot use assertRaises since it manually deletes the traceback
|
||
|
|
try:
|
||
|
|
inner()
|
||
|
|
except MemoryError as e:
|
||
|
|
self.assertNotEqual(wr(), None)
|
||
|
|
else:
|
||
|
|
self.fail("MemoryError not raised")
|
||
|
|
gc_collect() # For PyPy or other GCs.
|
||
|
|
self.assertEqual(wr(), None)
|
||
|
|
|
||
|
|
@no_tracing
|
||
|
|
def test_recursion_error_cleanup(self):
|
||
|
|
# Same test as above, but with "recursion exceeded" errors
|
||
|
|
class C:
|
||
|
|
pass
|
||
|
|
wr = None
|
||
|
|
def inner():
|
||
|
|
nonlocal wr
|
||
|
|
c = C()
|
||
|
|
wr = weakref.ref(c)
|
||
|
|
inner()
|
||
|
|
# We cannot use assertRaises since it manually deletes the traceback
|
||
|
|
try:
|
||
|
|
inner()
|
||
|
|
except RecursionError as e:
|
||
|
|
self.assertNotEqual(wr(), None)
|
||
|
|
else:
|
||
|
|
self.fail("RecursionError not raised")
|
||
|
|
gc_collect() # For PyPy or other GCs.
|
||
|
|
self.assertEqual(wr(), None)
|
||
|
|
|
||
|
|
def test_errno_ENOTDIR(self):
|
||
|
|
# Issue #12802: "not a directory" errors are ENOTDIR even on Windows
|
||
|
|
with self.assertRaises(OSError) as cm:
|
||
|
|
os.listdir(__file__)
|
||
|
|
self.assertEqual(cm.exception.errno, errno.ENOTDIR, cm.exception)
|
||
|
|
|
||
|
|
def test_unraisable(self):
|
||
|
|
# Issue #22836: PyErr_WriteUnraisable() should give sensible reports
|
||
|
|
class BrokenDel:
|
||
|
|
def __del__(self):
|
||
|
|
exc = ValueError("del is broken")
|
||
|
|
# The following line is included in the traceback report:
|
||
|
|
raise exc
|
||
|
|
|
||
|
|
obj = BrokenDel()
|
||
|
|
with support.catch_unraisable_exception() as cm:
|
||
|
|
del obj
|
||
|
|
|
||
|
|
gc_collect() # For PyPy or other GCs.
|
||
|
|
self.assertEqual(cm.unraisable.object, BrokenDel.__del__)
|
||
|
|
self.assertIsNotNone(cm.unraisable.exc_traceback)
|
||
|
|
|
||
|
|
def test_unhandled(self):
|
||
|
|
# Check for sensible reporting of unhandled exceptions
|
||
|
|
for exc_type in (ValueError, BrokenStrException):
|
||
|
|
with self.subTest(exc_type):
|
||
|
|
try:
|
||
|
|
exc = exc_type("test message")
|
||
|
|
# The following line is included in the traceback report:
|
||
|
|
raise exc
|
||
|
|
except exc_type:
|
||
|
|
with captured_stderr() as stderr:
|
||
|
|
sys.__excepthook__(*sys.exc_info())
|
||
|
|
report = stderr.getvalue()
|
||
|
|
self.assertIn("test_exceptions.py", report)
|
||
|
|
self.assertIn("raise exc", report)
|
||
|
|
self.assertIn(exc_type.__name__, report)
|
||
|
|
if exc_type is BrokenStrException:
|
||
|
|
self.assertIn("<exception str() failed>", report)
|
||
|
|
else:
|
||
|
|
self.assertIn("test message", report)
|
||
|
|
self.assertTrue(report.endswith("\n"))
|
||
|
|
|
||
|
|
@cpython_only
|
||
|
|
def test_memory_error_in_PyErr_PrintEx(self):
|
||
|
|
code = """if 1:
|
||
|
|
import _testcapi
|
||
|
|
class C(): pass
|
||
|
|
_testcapi.set_nomemory(0, %d)
|
||
|
|
C()
|
||
|
|
"""
|
||
|
|
|
||
|
|
# Issue #30817: Abort in PyErr_PrintEx() when no memory.
|
||
|
|
# Span a large range of tests as the CPython code always evolves with
|
||
|
|
# changes that add or remove memory allocations.
|
||
|
|
for i in range(1, 20):
|
||
|
|
rc, out, err = script_helper.assert_python_failure("-c", code % i)
|
||
|
|
self.assertIn(rc, (1, 120))
|
||
|
|
self.assertIn(b'MemoryError', err)
|
||
|
|
|
||
|
|
def test_yield_in_nested_try_excepts(self):
|
||
|
|
#Issue #25612
|
||
|
|
class MainError(Exception):
|
||
|
|
pass
|
||
|
|
|
||
|
|
class SubError(Exception):
|
||
|
|
pass
|
||
|
|
|
||
|
|
def main():
|
||
|
|
try:
|
||
|
|
raise MainError()
|
||
|
|
except MainError:
|
||
|
|
try:
|
||
|
|
yield
|
||
|
|
except SubError:
|
||
|
|
pass
|
||
|
|
raise
|
||
|
|
|
||
|
|
coro = main()
|
||
|
|
coro.send(None)
|
||
|
|
with self.assertRaises(MainError):
|
||
|
|
coro.throw(SubError())
|
||
|
|
|
||
|
|
def test_generator_doesnt_retain_old_exc2(self):
|
||
|
|
#Issue 28884#msg282532
|
||
|
|
def g():
|
||
|
|
try:
|
||
|
|
raise ValueError
|
||
|
|
except ValueError:
|
||
|
|
yield 1
|
||
|
|
self.assertEqual(sys.exc_info(), (None, None, None))
|
||
|
|
yield 2
|
||
|
|
|
||
|
|
gen = g()
|
||
|
|
|
||
|
|
try:
|
||
|
|
raise IndexError
|
||
|
|
except IndexError:
|
||
|
|
self.assertEqual(next(gen), 1)
|
||
|
|
self.assertEqual(next(gen), 2)
|
||
|
|
|
||
|
|
def test_raise_in_generator(self):
|
||
|
|
#Issue 25612#msg304117
|
||
|
|
def g():
|
||
|
|
yield 1
|
||
|
|
raise
|
||
|
|
yield 2
|
||
|
|
|
||
|
|
with self.assertRaises(ZeroDivisionError):
|
||
|
|
i = g()
|
||
|
|
try:
|
||
|
|
1/0
|
||
|
|
except:
|
||
|
|
next(i)
|
||
|
|
next(i)
|
||
|
|
|
||
|
|
@unittest.skipUnless(__debug__, "Won't work if __debug__ is False")
|
||
|
|
def test_assert_shadowing(self):
|
||
|
|
# Shadowing AssertionError would cause the assert statement to
|
||
|
|
# misbehave.
|
||
|
|
global AssertionError
|
||
|
|
AssertionError = TypeError
|
||
|
|
try:
|
||
|
|
assert False, 'hello'
|
||
|
|
except BaseException as e:
|
||
|
|
del AssertionError
|
||
|
|
self.assertIsInstance(e, AssertionError)
|
||
|
|
self.assertEqual(str(e), 'hello')
|
||
|
|
else:
|
||
|
|
del AssertionError
|
||
|
|
self.fail('Expected exception')
|
||
|
|
|
||
|
|
def test_memory_error_subclasses(self):
|
||
|
|
# bpo-41654: MemoryError instances use a freelist of objects that are
|
||
|
|
# linked using the 'dict' attribute when they are inactive/dead.
|
||
|
|
# Subclasses of MemoryError should not participate in the freelist
|
||
|
|
# schema. This test creates a MemoryError object and keeps it alive
|
||
|
|
# (therefore advancing the freelist) and then it creates and destroys a
|
||
|
|
# subclass object. Finally, it checks that creating a new MemoryError
|
||
|
|
# succeeds, proving that the freelist is not corrupted.
|
||
|
|
|
||
|
|
class TestException(MemoryError):
|
||
|
|
pass
|
||
|
|
|
||
|
|
try:
|
||
|
|
raise MemoryError
|
||
|
|
except MemoryError as exc:
|
||
|
|
inst = exc
|
||
|
|
|
||
|
|
try:
|
||
|
|
raise TestException
|
||
|
|
except Exception:
|
||
|
|
pass
|
||
|
|
|
||
|
|
for _ in range(10):
|
||
|
|
try:
|
||
|
|
raise MemoryError
|
||
|
|
except MemoryError as exc:
|
||
|
|
pass
|
||
|
|
|
||
|
|
gc_collect()
|
||
|
|
|
||
|
|
|
||
|
|
class ImportErrorTests(unittest.TestCase):
|
||
|
|
|
||
|
|
def test_attributes(self):
|
||
|
|
# Setting 'name' and 'path' should not be a problem.
|
||
|
|
exc = ImportError('test')
|
||
|
|
self.assertIsNone(exc.name)
|
||
|
|
self.assertIsNone(exc.path)
|
||
|
|
|
||
|
|
exc = ImportError('test', name='somemodule')
|
||
|
|
self.assertEqual(exc.name, 'somemodule')
|
||
|
|
self.assertIsNone(exc.path)
|
||
|
|
|
||
|
|
exc = ImportError('test', path='somepath')
|
||
|
|
self.assertEqual(exc.path, 'somepath')
|
||
|
|
self.assertIsNone(exc.name)
|
||
|
|
|
||
|
|
exc = ImportError('test', path='somepath', name='somename')
|
||
|
|
self.assertEqual(exc.name, 'somename')
|
||
|
|
self.assertEqual(exc.path, 'somepath')
|
||
|
|
|
||
|
|
msg = "'invalid' is an invalid keyword argument for ImportError"
|
||
|
|
with self.assertRaisesRegex(TypeError, msg):
|
||
|
|
ImportError('test', invalid='keyword')
|
||
|
|
|
||
|
|
with self.assertRaisesRegex(TypeError, msg):
|
||
|
|
ImportError('test', name='name', invalid='keyword')
|
||
|
|
|
||
|
|
with self.assertRaisesRegex(TypeError, msg):
|
||
|
|
ImportError('test', path='path', invalid='keyword')
|
||
|
|
|
||
|
|
with self.assertRaisesRegex(TypeError, msg):
|
||
|
|
ImportError(invalid='keyword')
|
||
|
|
|
||
|
|
with self.assertRaisesRegex(TypeError, msg):
|
||
|
|
ImportError('test', invalid='keyword', another=True)
|
||
|
|
|
||
|
|
def test_reset_attributes(self):
|
||
|
|
exc = ImportError('test', name='name', path='path')
|
||
|
|
self.assertEqual(exc.args, ('test',))
|
||
|
|
self.assertEqual(exc.msg, 'test')
|
||
|
|
self.assertEqual(exc.name, 'name')
|
||
|
|
self.assertEqual(exc.path, 'path')
|
||
|
|
|
||
|
|
# Reset not specified attributes
|
||
|
|
exc.__init__()
|
||
|
|
self.assertEqual(exc.args, ())
|
||
|
|
self.assertEqual(exc.msg, None)
|
||
|
|
self.assertEqual(exc.name, None)
|
||
|
|
self.assertEqual(exc.path, None)
|
||
|
|
|
||
|
|
def test_non_str_argument(self):
|
||
|
|
# Issue #15778
|
||
|
|
with check_warnings(('', BytesWarning), quiet=True):
|
||
|
|
arg = b'abc'
|
||
|
|
exc = ImportError(arg)
|
||
|
|
self.assertEqual(str(arg), str(exc))
|
||
|
|
|
||
|
|
def test_copy_pickle(self):
|
||
|
|
for kwargs in (dict(),
|
||
|
|
dict(name='somename'),
|
||
|
|
dict(path='somepath'),
|
||
|
|
dict(name='somename', path='somepath')):
|
||
|
|
orig = ImportError('test', **kwargs)
|
||
|
|
for proto in range(pickle.HIGHEST_PROTOCOL + 1):
|
||
|
|
exc = pickle.loads(pickle.dumps(orig, proto))
|
||
|
|
self.assertEqual(exc.args, ('test',))
|
||
|
|
self.assertEqual(exc.msg, 'test')
|
||
|
|
self.assertEqual(exc.name, orig.name)
|
||
|
|
self.assertEqual(exc.path, orig.path)
|
||
|
|
for c in copy.copy, copy.deepcopy:
|
||
|
|
exc = c(orig)
|
||
|
|
self.assertEqual(exc.args, ('test',))
|
||
|
|
self.assertEqual(exc.msg, 'test')
|
||
|
|
self.assertEqual(exc.name, orig.name)
|
||
|
|
self.assertEqual(exc.path, orig.path)
|
||
|
|
|
||
|
|
|
||
|
|
if __name__ == '__main__':
|
||
|
|
unittest.main()
|