283 lines
8.5 KiB
Python
283 lines
8.5 KiB
Python
import unittest
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import operator
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import sys
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import pickle
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import gc
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from test import support
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class G:
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'Sequence using __getitem__'
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def __init__(self, seqn):
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self.seqn = seqn
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def __getitem__(self, i):
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return self.seqn[i]
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class I:
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'Sequence using iterator protocol'
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def __init__(self, seqn):
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self.seqn = seqn
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self.i = 0
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def __iter__(self):
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return self
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def __next__(self):
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if self.i >= len(self.seqn): raise StopIteration
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v = self.seqn[self.i]
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self.i += 1
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return v
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class Ig:
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'Sequence using iterator protocol defined with a generator'
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def __init__(self, seqn):
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self.seqn = seqn
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self.i = 0
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def __iter__(self):
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for val in self.seqn:
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yield val
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class X:
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'Missing __getitem__ and __iter__'
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def __init__(self, seqn):
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self.seqn = seqn
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self.i = 0
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def __next__(self):
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if self.i >= len(self.seqn): raise StopIteration
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v = self.seqn[self.i]
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self.i += 1
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return v
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class E:
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'Test propagation of exceptions'
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def __init__(self, seqn):
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self.seqn = seqn
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self.i = 0
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def __iter__(self):
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return self
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def __next__(self):
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3 // 0
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class N:
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'Iterator missing __next__()'
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def __init__(self, seqn):
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self.seqn = seqn
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self.i = 0
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def __iter__(self):
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return self
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class PickleTest:
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# Helper to check picklability
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def check_pickle(self, itorg, seq):
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for proto in range(pickle.HIGHEST_PROTOCOL + 1):
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d = pickle.dumps(itorg, proto)
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it = pickle.loads(d)
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self.assertEqual(type(itorg), type(it))
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self.assertEqual(list(it), seq)
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it = pickle.loads(d)
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try:
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next(it)
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except StopIteration:
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self.assertFalse(seq[1:])
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continue
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d = pickle.dumps(it, proto)
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it = pickle.loads(d)
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self.assertEqual(list(it), seq[1:])
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class EnumerateTestCase(unittest.TestCase, PickleTest):
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enum = enumerate
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seq, res = 'abc', [(0,'a'), (1,'b'), (2,'c')]
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def test_basicfunction(self):
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self.assertEqual(type(self.enum(self.seq)), self.enum)
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e = self.enum(self.seq)
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self.assertEqual(iter(e), e)
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self.assertEqual(list(self.enum(self.seq)), self.res)
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self.enum.__doc__
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def test_pickle(self):
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self.check_pickle(self.enum(self.seq), self.res)
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def test_getitemseqn(self):
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self.assertEqual(list(self.enum(G(self.seq))), self.res)
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e = self.enum(G(''))
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self.assertRaises(StopIteration, next, e)
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def test_iteratorseqn(self):
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self.assertEqual(list(self.enum(I(self.seq))), self.res)
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e = self.enum(I(''))
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self.assertRaises(StopIteration, next, e)
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def test_iteratorgenerator(self):
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self.assertEqual(list(self.enum(Ig(self.seq))), self.res)
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e = self.enum(Ig(''))
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self.assertRaises(StopIteration, next, e)
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def test_noniterable(self):
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self.assertRaises(TypeError, self.enum, X(self.seq))
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def test_illformediterable(self):
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self.assertRaises(TypeError, self.enum, N(self.seq))
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def test_exception_propagation(self):
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self.assertRaises(ZeroDivisionError, list, self.enum(E(self.seq)))
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def test_argumentcheck(self):
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self.assertRaises(TypeError, self.enum) # no arguments
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self.assertRaises(TypeError, self.enum, 1) # wrong type (not iterable)
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self.assertRaises(TypeError, self.enum, 'abc', 'a') # wrong type
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self.assertRaises(TypeError, self.enum, 'abc', 2, 3) # too many arguments
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@support.cpython_only
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def test_tuple_reuse(self):
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# Tests an implementation detail where tuple is reused
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# whenever nothing else holds a reference to it
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self.assertEqual(len(set(map(id, list(enumerate(self.seq))))), len(self.seq))
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self.assertEqual(len(set(map(id, enumerate(self.seq)))), min(1,len(self.seq)))
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@support.cpython_only
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def test_enumerate_result_gc(self):
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# bpo-42536: enumerate's tuple-reuse speed trick breaks the GC's
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# assumptions about what can be untracked. Make sure we re-track result
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# tuples whenever we reuse them.
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it = self.enum([[]])
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gc.collect()
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# That GC collection probably untracked the recycled internal result
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# tuple, which is initialized to (None, None). Make sure it's re-tracked
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# when it's mutated and returned from __next__:
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self.assertTrue(gc.is_tracked(next(it)))
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class MyEnum(enumerate):
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pass
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class SubclassTestCase(EnumerateTestCase):
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enum = MyEnum
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class TestEmpty(EnumerateTestCase):
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seq, res = '', []
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class TestBig(EnumerateTestCase):
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seq = range(10,20000,2)
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res = list(zip(range(20000), seq))
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class TestReversed(unittest.TestCase, PickleTest):
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def test_simple(self):
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class A:
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def __getitem__(self, i):
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if i < 5:
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return str(i)
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raise StopIteration
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def __len__(self):
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return 5
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for data in ('abc', range(5), tuple(enumerate('abc')), A(),
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range(1,17,5), dict.fromkeys('abcde')):
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self.assertEqual(list(data)[::-1], list(reversed(data)))
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# don't allow keyword arguments
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self.assertRaises(TypeError, reversed, [], a=1)
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def test_range_optimization(self):
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x = range(1)
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self.assertEqual(type(reversed(x)), type(iter(x)))
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def test_len(self):
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for s in ('hello', tuple('hello'), list('hello'), range(5)):
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self.assertEqual(operator.length_hint(reversed(s)), len(s))
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r = reversed(s)
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list(r)
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self.assertEqual(operator.length_hint(r), 0)
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class SeqWithWeirdLen:
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called = False
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def __len__(self):
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if not self.called:
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self.called = True
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return 10
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raise ZeroDivisionError
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def __getitem__(self, index):
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return index
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r = reversed(SeqWithWeirdLen())
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self.assertRaises(ZeroDivisionError, operator.length_hint, r)
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def test_gc(self):
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class Seq:
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def __len__(self):
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return 10
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def __getitem__(self, index):
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return index
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s = Seq()
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r = reversed(s)
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s.r = r
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def test_args(self):
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self.assertRaises(TypeError, reversed)
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self.assertRaises(TypeError, reversed, [], 'extra')
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@unittest.skipUnless(hasattr(sys, 'getrefcount'), 'test needs sys.getrefcount()')
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def test_bug1229429(self):
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# this bug was never in reversed, it was in
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# PyObject_CallMethod, and reversed_new calls that sometimes.
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def f():
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pass
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r = f.__reversed__ = object()
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rc = sys.getrefcount(r)
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for i in range(10):
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try:
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reversed(f)
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except TypeError:
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pass
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else:
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self.fail("non-callable __reversed__ didn't raise!")
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self.assertEqual(rc, sys.getrefcount(r))
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def test_objmethods(self):
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# Objects must have __len__() and __getitem__() implemented.
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class NoLen(object):
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def __getitem__(self, i): return 1
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nl = NoLen()
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self.assertRaises(TypeError, reversed, nl)
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class NoGetItem(object):
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def __len__(self): return 2
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ngi = NoGetItem()
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self.assertRaises(TypeError, reversed, ngi)
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class Blocked(object):
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def __getitem__(self, i): return 1
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def __len__(self): return 2
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__reversed__ = None
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b = Blocked()
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self.assertRaises(TypeError, reversed, b)
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def test_pickle(self):
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for data in 'abc', range(5), tuple(enumerate('abc')), range(1,17,5):
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self.check_pickle(reversed(data), list(data)[::-1])
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class EnumerateStartTestCase(EnumerateTestCase):
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def test_basicfunction(self):
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e = self.enum(self.seq)
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self.assertEqual(iter(e), e)
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self.assertEqual(list(self.enum(self.seq)), self.res)
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class TestStart(EnumerateStartTestCase):
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enum = lambda self, i: enumerate(i, start=11)
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seq, res = 'abc', [(11, 'a'), (12, 'b'), (13, 'c')]
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class TestLongStart(EnumerateStartTestCase):
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enum = lambda self, i: enumerate(i, start=sys.maxsize+1)
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seq, res = 'abc', [(sys.maxsize+1,'a'), (sys.maxsize+2,'b'),
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(sys.maxsize+3,'c')]
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if __name__ == "__main__":
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unittest.main()
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