In debug, using pandas before importing from Scipy generates Type error on import

Question

When run in debug in PyCharm 2021.3 (Community Edition) on Mac, the code:

import pandas as pd
x = pd.DataFrame()
from scipy.stats import poisson

Generates the exception:

...
  File "/.../venv/lib/python3.10/site-packages/numpy/core/getlimits.py", line 518, in __init__
    self.dtype = numeric.dtype(type(int_type))
TypeError: 'NoneType' object is not callable

(the None variable is numeric.dtype)

Python 3.10.0
dependencies: pip install numpy==1.21.2 pandas==1.3.5 scipy==1.7.3

Answer 1

This is a known (but not solved) issue; see pandas issue 41935 on github. Some comments there suggest it might be a Python or Cython bug.