STINNER Victor <[email protected]> added the comment:
pickle.dump(x) checks if x is a type since commit
f048a8f6d79173cc1da1bf12c60ae06fea36762c (March 2002) of bpo-494904:
Pickler.save(): Fix for SF bug #494904: Cannot pickle a class with a
metaclass, reported by Dan Parisien.
+ if issubclass(t, TypeType):
+ self.save_global(object)
+ return
Followed by a minor fix: commit 85ee491b3af3e1c124522249a52443b4d8c34c88 of
bpo-502085:
Don't die when issubclass(t, TypeType) fails.
- if issubclass(t, TypeType):
+ try:
+ issc = issubclass(t, TypeType)
+ except TypeError: # t is not a class
+ issc = 0
copy.deepcopy(x) returns x if it's a type since commit
11ade1ddc053dcec884e2431b55fb1c1727c65d7 (June 2002) of bpo-560794.
SF patch 560794 (Greg Chapman): deepcopy can't handle custom
metaclasses.
try:
- copier = x.__deepcopy__
- except AttributeError:
+ issc = issubclass(type(x), type)
+ except TypeError:
+ issc = 0
+ if issc:
+ y = _deepcopy_dispatch[type](x, memo)
+ else:
(...)
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<https://bugs.python.org/issue47143>
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