Michael Van Biesbrouck added the comment:
Guido pointed out a common use case where people use bound methods in a
way that would be poorly served by my change. An alternate
implementation with a deeper copy will cause less surprise:
def _deepcopy_method(x, memo):
return type(x)(x.im_func, deepcopy(x.im_self, memo), x.im_class)
d[types.MethodType] = _deepcopy_method
The function and class are still shallow-copied but the bound object is
deep-copied. I use type(x)() instead of types.MethodType() because
types will be unbound when the function runs.
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<http://bugs.python.org/issue1515>
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