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In Python 3.8:
Python 3.8.12 (default, Oct 4 2021, 15:56:52)[GCC 9.3.0] on linuxType "help", "copyright", "credits" or "license" for more information.>>> import _struct>>> _struct.Struct.x = 1Traceback (most recent call last): File "<stdin>", line 1, in <module>TypeError: can't set attributes of built-in/extension type 'Struct'>>>
On main:
Python 3.12.0a0 (heads/gh-94207-fix-struct-module-leak:9d41baebd0, Jun 25 2022, 07:23:49) [GCC 9.4.0] on linuxType "help", "copyright", "credits" or "license" for more information.>>> import _struct>>> _struct.Struct.x=1>>> _struct.Struct.x1
This happens because_struct.Struct is missingPy_TPFLAGS_IMMUTABLETYPE in type flags.