Henry Prêcheur

"I don't understand with exec "make" the resulting classes pickle and not type: test.py: TypeClass = type('TypeClass', (object,), {'x': 42}) exec 'class ExecClass(object): x = 42' class NormalClass(object): x = 42 It works fine: >>> import test >>> import pickle >>> pickle.dumps(test.TypeClass()) 'ccopy_reg\n_reconstructor\np0\n(ctest\nTypeClass\np1\nc__builtin__\nobject\np2\nNtp3\nRp4\n.' >>> pickle.dumps(test.ExecClass()) 'ccopy_reg\n_reconstructor\np0\n(ctest\nExecClass\np1\nc__builtin__\nobject\np2\nNtp3\nRp4\n.' >>> pickle.dumps(test.NormalClass()) 'ccopy_reg\n_reconstructor\np0\n(ctest\nNormalClass\np1\nc__builtin__\nobject\np2\nNtp3\nRp4\n.' According to your example, you need to put the 'exec' class in __module__ too." - Henry Prêcheur