mirror of https://github.com/python/cpython
make inspect.isabstract() always return a boolean; add a test for it, too #7069
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@ -242,7 +242,7 @@ def isroutine(object):
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def isabstract(object):
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"""Return true if the object is an abstract base class (ABC)."""
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return isinstance(object, type) and object.__flags__ & TPFLAGS_IS_ABSTRACT
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return bool(isinstance(object, type) and object.__flags__ & TPFLAGS_IS_ABSTRACT)
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def getmembers(object, predicate=None):
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"""Return all members of an object as (name, value) pairs sorted by name.
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@ -115,6 +115,29 @@ class TestPredicates(IsTestBase):
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self.assertTrue('a' in members)
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self.assertTrue('b' not in members)
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def test_isabstract(self):
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from abc import ABCMeta, abstractmethod
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class AbstractClassExample(object):
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__metaclass__ = ABCMeta
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@abstractmethod
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def foo(self):
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pass
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class ClassExample(AbstractClassExample):
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def foo(self):
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pass
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a = ClassExample()
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# Test general behaviour.
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self.assertTrue(inspect.isabstract(AbstractClassExample))
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self.assertFalse(inspect.isabstract(ClassExample))
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self.assertFalse(inspect.isabstract(a))
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self.assertFalse(inspect.isabstract(int))
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self.assertFalse(inspect.isabstract(5))
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class TestInterpreterStack(IsTestBase):
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def __init__(self, *args, **kwargs):
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