Terry J. Reedy added the comment:
You are right. While multiple info requests work, I found a test that fails.
'list' showed that I had Pillow 2.7.0. 'install -U Pillow' updated to 2.9.0'.
'list' again still showed 2.7.0. 'show Pillow' then failed because 2.7.0 could
not be found. After an install, we need to delete the one local reference to
pip(.main), which should remain the only reference, and reload to refresh that
cache.
There is an obscure bug in either python, pip, or tem_pip such that
runpip('-h') silently crashes python in both console and Idle. I will try to
localize it.
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