import pandas 一直出错，试了很多方法都没用，最后解决。

Traceback (most recent call last):
  File "C:\Users\PC\AppData\Roaming\Python\Python38\site-packages\pandas\__init__.py", line 30, in <module>
    from pandas._libs import hashtable as _hashtable, lib as _lib, tslib as _tslib
  File "C:\Users\PC\AppData\Roaming\Python\Python38\site-packages\pandas\_libs\__init__.py", line 13, in <module>
    from pandas._libs.interval import Interval
ModuleNotFoundError: No module named 'pandas._libs.interval'

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "C:/Users/PC/PycharmProjects/pythonProject1/ex1.py", line 2, in <module>
    import pandas as pd
  File "C:\Users\PC\AppData\Roaming\Python\Python38\site-packages\pandas\__init__.py", line 34, in <module>
    raise ImportError(
ImportError: C extension: No module named 'pandas._libs.interval' not built. If you want to import pandas from the source directory, you may need to run 'python setup.py build_ext --inplace --force' to build the C extensions first.

解决方法

pip install --force-reinstall pandas