[PLUG] Fixing a Python library mismatch

[Walt Mankowski via plug <plug@lists.phillylinux.org>]

Today I discovered that when I try to import numpy I'm getting the
following error:

% python
Python 3.8.2 (default, Apr  9 2020, 20:21:36) 
[GCC 9.2.1 20191008] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import numpy
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/home/waltman/.pyenv/versions/3.8.2/lib/python3.8/site-packages/numpy/__init__.py", line 142, in <module>
    from . import core
  File "/home/waltman/.pyenv/versions/3.8.2/lib/python3.8/site-packages/numpy/core/__init__.py", line 102, in <module>
    from . import _dtype_ctypes
  File "/home/waltman/.pyenv/versions/3.8.2/lib/python3.8/site-packages/numpy/core/_dtype_ctypes.py", line 25, in <module>
    import _ctypes
ImportError: libffi.so.6: cannot open shared object file: No such file or directory

This almost certainly broke when I updated to Ubuntu 20.04 a few weeks
ago. It probably removed libffi.so.6 and replaced it with
libffi.so.7. I can't figure out how to rebuild numpy with the new
library. I've tried `pip uninstall numpy; pip install numpy` but that
didn't have any effect.

Anyone have any suggestions on how to fix it? I'm using pyenv and pip.

Walt

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