fix(tests): Fix exception on copying frame.f_locals (Python 3.13)
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Starting from Python 3.13, `frame.f_locals` is not `dict` anymore, but `FrameLocalsProxy`, that cannot be copied using `copy.copy()`. In Python 3.13 and later, it should be copied using a method `.copy()`. The new way of copying works the same as the old one for versions of Python prior to 3.13, according to the documentation (both copying methods produce a shallow copy). Since Python 3.13, `FrameLocalsProxy` skips items of `locals()` that have non-`str` keys; this is a CPython implementation detail, so we hence disable `test_non_string_variables` test on Python 3.13. See: https://peps.python.org/pep-0667/ python/cpython#118921 python/cpython#118923 https://docs.python.org/3.13/whatsnew/3.13.html#porting-to-python-3-13 https://docs.python.org/3/library/copy.html https://github.com/python/cpython/blame/7b413952e817ae87bfda2ac85dd84d30a6ce743b/Objects/frameobject.c#L148
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Starting from Python 3.13,
frame.f_localsis notdictanymore, butFrameLocalsProxy, that cannot be copied usingcopy.copy(). In Python 3.13 and later, it should be copied using a method.copy(). The new way of copying works the same as the old one for versions of Python prior to 3.13, according to the documentation (both copying methods produce a shallow copy).Since Python 3.13,
FrameLocalsProxyskips items oflocals()that have non-strkeys; this is a CPython implementation detail. Disabletest_non_string_variablestest on Python 3.13.See:
https://peps.python.org/pep-0667/
python/cpython#118921
python/cpython#118923
https://docs.python.org/3.13/whatsnew/3.13.html#porting-to-python-3-13
https://docs.python.org/3/library/copy.html
https://github.com/python/cpython/blame/7b413952e817ae87bfda2ac85dd84d30a6ce743b/Objects/frameobject.c#L148
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