Dan Snider <mr.assume.a...@gmail.com> added the comment: So while CO_NOFREE is set in all versions with the example code, it appears only python 3.6 recognizes that flag and disallows the accessing of the __class__ cell. In this case the error message is bad because it implies that the __class__ cell is the wrong type. Disabling the flag when creating the code objects allows the above code to work.
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