test_inspect.py 文件源码

def test_signature_on_builtin_class(self):
        self.assertEqual(str(inspect.signature(_pickle.Pickler)),
                         '(file, protocol=None, fix_imports=True)')

        class P(_pickle.Pickler): pass
        class EmptyTrait: pass
        class P2(EmptyTrait, P): pass
        self.assertEqual(str(inspect.signature(P)),
                         '(file, protocol=None, fix_imports=True)')
        self.assertEqual(str(inspect.signature(P2)),
                         '(file, protocol=None, fix_imports=True)')

        class P3(P2):
            def __init__(self, spam):
                pass
        self.assertEqual(str(inspect.signature(P3)), '(spam)')

        class MetaP(type):
            def __call__(cls, foo, bar):
                pass
        class P4(P2, metaclass=MetaP):
            pass
        self.assertEqual(str(inspect.signature(P4)), '(foo, bar)')