Method test_reduce_copying

Lib/test/test_descr.py:5836–5958

(self)

    @support.thread_unsafe
    def test_reduce_copying(self):
        # Tests pickling and copying new-style classes and objects.
        global C1
        class C1:
            "The state of this class is copyable via its instance dict."
            ARGS = (1, 2)
            NEED_DICT_COPYING = True
            def __init__(self, a, b):
                super().__init__()
                self.a = a
                self.b = b
            def __repr__(self):
                return "C1(%r, %r)" % (self.a, self.b)

        global C2
        class C2(list):
            "A list subclass copyable via __getnewargs__."
            ARGS = (1, 2)
            NEED_DICT_COPYING = False
            def __new__(cls, a, b):
                self = super().__new__(cls)
                self.a = a
                self.b = b
                return self
            def __init__(self, *args):
                super().__init__()
                # This helps testing that __init__ is not called during the
                # unpickling process, which would cause extra appends.
                self.append("cheese")
            @classmethod
            def __getnewargs__(cls):
                return cls.ARGS
            def __repr__(self):
                return "C2(%r, %r)<%r>" % (self.a, self.b, list(self))

        global C3
        class C3(list):
            "A list subclass copyable via __getstate__."
            ARGS = (1, 2)
            NEED_DICT_COPYING = False
            def __init__(self, a, b):
                self.a = a
                self.b = b
                # This helps testing that __init__ is not called during the
                # unpickling process, which would cause extra appends.
                self.append("cheese")
            @classmethod
            def __getstate__(cls):
                return cls.ARGS
            def __setstate__(self, state):
                a, b = state
                self.a = a
                self.b = b
            def __repr__(self):
                return "C3(%r, %r)<%r>" % (self.a, self.b, list(self))

        global C4
        class C4(int):