» ./python.exe
Python 3.12.0a1+ (heads/cover-pysequence-slice-dirty:04cb2ecd5d, Nov  5 2022, 16:01:29) [Clang 11.0.0 (clang-1100.0.33.16)] on darwin
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>>> import pickle, statistics
>>> n = statistics.NormalDist(37.5, 5.625)
>>> pickle.dumps(n, protocol=0)  # or `1`
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/Users/sobolev/Desktop/cpython/Lib/copyreg.py", line 94, in _reduce_ex
    raise TypeError("a class that defines __slots__ without "
TypeError: a class that defines __slots__ without defining __getstate__ cannot be pickled