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Python library: certifi

In a Python interpreter: 
>>> import certifi
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ModuleNotFoundError: No module named 'certifi'
>>> quit()
Then, on the (non-Python) command line (for example PowerShell): 
PS> pip install certifi
…
Successfully installed certifi-2021.10.8
…
PS> py -m certifi
C:\Python311\lib\site-packages\certifi\cacert.pem

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