178 lines
6.9 KiB
Python
178 lines
6.9 KiB
Python
"""Unit tests for the keyword only argument specified in PEP 3102."""
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__author__ = "Jiwon Seo"
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__email__ = "seojiwon at gmail dot com"
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import unittest
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def posonly_sum(pos_arg1, *arg, **kwarg):
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return pos_arg1 + sum(arg) + sum(kwarg.values())
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def keywordonly_sum(*, k1=0, k2):
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return k1 + k2
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def keywordonly_nodefaults_sum(*, k1, k2):
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return k1 + k2
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def keywordonly_and_kwarg_sum(*, k1, k2, **kwarg):
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return k1 + k2 + sum(kwarg.values())
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def mixedargs_sum(a, b=0, *arg, k1, k2=0):
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return a + b + k1 + k2 + sum(arg)
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def mixedargs_sum2(a, b=0, *arg, k1, k2=0, **kwargs):
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return a + b + k1 + k2 + sum(arg) + sum(kwargs.values())
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def sortnum(*nums, reverse=False):
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return sorted(list(nums), reverse=reverse)
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def sortwords(*words, reverse=False, **kwargs):
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return sorted(list(words), reverse=reverse)
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class Foo:
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def __init__(self, *, k1, k2=0):
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self.k1 = k1
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self.k2 = k2
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def set(self, p1, *, k1, k2):
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self.k1 = k1
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self.k2 = k2
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def sum(self):
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return self.k1 + self.k2
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class KeywordOnlyArgTestCase(unittest.TestCase):
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def assertRaisesSyntaxError(self, codestr):
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def shouldRaiseSyntaxError(s):
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compile(s, "<test>", "single")
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self.assertRaises(SyntaxError, shouldRaiseSyntaxError, codestr)
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def testSyntaxErrorForFunctionDefinition(self):
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self.assertRaisesSyntaxError("def f(p, *):\n pass\n")
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self.assertRaisesSyntaxError("def f(p1, *, p1=100):\n pass\n")
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self.assertRaisesSyntaxError("def f(p1, *k1, k1=100):\n pass\n")
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self.assertRaisesSyntaxError("def f(p1, *, k1, k1=100):\n pass\n")
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self.assertRaisesSyntaxError("def f(p1, *, **k1):\n pass\n")
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self.assertRaisesSyntaxError("def f(p1, *, k1, **k1):\n pass\n")
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self.assertRaisesSyntaxError("def f(p1, *, None, **k1):\n pass\n")
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self.assertRaisesSyntaxError("def f(p, *, (k1, k2), **kw):\n pass\n")
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def testSyntaxForManyArguments(self):
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# more than 255 positional arguments, should compile ok
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fundef = "def f(%s):\n pass\n" % ', '.join('i%d' % i for i in range(300))
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compile(fundef, "<test>", "single")
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# more than 255 keyword-only arguments, should compile ok
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fundef = "def f(*, %s):\n pass\n" % ', '.join('i%d' % i for i in range(300))
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compile(fundef, "<test>", "single")
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def testTooManyPositionalErrorMessage(self):
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def f(a, b=None, *, c=None):
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pass
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with self.assertRaises(TypeError) as exc:
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f(1, 2, 3)
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expected = "f() takes from 1 to 2 positional arguments but 3 were given"
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self.assertEqual(str(exc.exception), expected)
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def testSyntaxErrorForFunctionCall(self):
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self.assertRaisesSyntaxError("f(p, k=1, p2)")
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self.assertRaisesSyntaxError("f(p, k1=50, *(1,2), k1=100)")
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def testRaiseErrorFuncallWithUnexpectedKeywordArgument(self):
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self.assertRaises(TypeError, keywordonly_sum, ())
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self.assertRaises(TypeError, keywordonly_nodefaults_sum, ())
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self.assertRaises(TypeError, Foo, ())
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try:
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keywordonly_sum(k2=100, non_existing_arg=200)
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self.fail("should raise TypeError")
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except TypeError:
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pass
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try:
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keywordonly_nodefaults_sum(k2=2)
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self.fail("should raise TypeError")
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except TypeError:
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pass
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def testFunctionCall(self):
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self.assertEqual(1, posonly_sum(1))
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self.assertEqual(1+2, posonly_sum(1,**{"2":2}))
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self.assertEqual(1+2+3, posonly_sum(1,*(2,3)))
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self.assertEqual(1+2+3+4, posonly_sum(1,*(2,3),**{"4":4}))
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self.assertEqual(1, keywordonly_sum(k2=1))
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self.assertEqual(1+2, keywordonly_sum(k1=1, k2=2))
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self.assertEqual(1+2, keywordonly_and_kwarg_sum(k1=1, k2=2))
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self.assertEqual(1+2+3, keywordonly_and_kwarg_sum(k1=1, k2=2, k3=3))
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self.assertEqual(1+2+3+4,
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keywordonly_and_kwarg_sum(k1=1, k2=2,
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**{"a":3,"b":4}))
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self.assertEqual(1+2, mixedargs_sum(1, k1=2))
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self.assertEqual(1+2+3, mixedargs_sum(1, 2, k1=3))
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self.assertEqual(1+2+3+4, mixedargs_sum(1, 2, k1=3, k2=4))
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self.assertEqual(1+2+3+4+5, mixedargs_sum(1, 2, 3, k1=4, k2=5))
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self.assertEqual(1+2, mixedargs_sum2(1, k1=2))
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self.assertEqual(1+2+3, mixedargs_sum2(1, 2, k1=3))
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self.assertEqual(1+2+3+4, mixedargs_sum2(1, 2, k1=3, k2=4))
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self.assertEqual(1+2+3+4+5, mixedargs_sum2(1, 2, 3, k1=4, k2=5))
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self.assertEqual(1+2+3+4+5+6,
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mixedargs_sum2(1, 2, 3, k1=4, k2=5, k3=6))
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self.assertEqual(1+2+3+4+5+6,
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mixedargs_sum2(1, 2, 3, k1=4, **{'k2':5, 'k3':6}))
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self.assertEqual(1, Foo(k1=1).sum())
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self.assertEqual(1+2, Foo(k1=1,k2=2).sum())
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self.assertEqual([1,2,3], sortnum(3,2,1))
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self.assertEqual([3,2,1], sortnum(1,2,3, reverse=True))
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self.assertEqual(['a','b','c'], sortwords('a','c','b'))
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self.assertEqual(['c','b','a'], sortwords('a','c','b', reverse=True))
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self.assertEqual(['c','b','a'],
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sortwords('a','c','b', reverse=True, ignore='ignore'))
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def testKwDefaults(self):
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def foo(p1,p2=0, *, k1, k2=0):
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return p1 + p2 + k1 + k2
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self.assertEqual(2, foo.__code__.co_kwonlyargcount)
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self.assertEqual({"k2":0}, foo.__kwdefaults__)
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foo.__kwdefaults__ = {"k1":0}
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try:
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foo(1,k1=10)
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self.fail("__kwdefaults__ is not properly changed")
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except TypeError:
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pass
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def test_kwonly_methods(self):
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class Example:
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def f(self, *, k1=1, k2=2):
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return k1, k2
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self.assertEqual(Example().f(k1=1, k2=2), (1, 2))
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self.assertEqual(Example.f(Example(), k1=1, k2=2), (1, 2))
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self.assertRaises(TypeError, Example.f, k1=1, k2=2)
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def test_issue13343(self):
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# The Python compiler must scan all symbols of a function to
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# determine their scope: global, local, cell...
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# This was not done for the default values of keyword
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# arguments in a lambda definition, and the following line
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# used to fail with a SystemError.
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lambda *, k1=unittest: None
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def test_mangling(self):
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class X:
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def f(self, *, __a=42):
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return __a
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self.assertEqual(X().f(), 42)
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def test_default_evaluation_order(self):
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# See issue 16967
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a = 42
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with self.assertRaises(NameError) as err:
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def f(v=a, x=b, *, y=c, z=d):
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pass
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self.assertEqual(str(err.exception), "name 'b' is not defined")
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with self.assertRaises(NameError) as err:
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f = lambda v=a, x=b, *, y=c, z=d: None
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self.assertEqual(str(err.exception), "name 'b' is not defined")
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if __name__ == "__main__":
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unittest.main()
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