I isolated the environment with virtualenv, direnv, etc.
pip list
Will bring up a large number of packages (= system pip installed packages).
In this case, PYTHONPATH
contained /usr/lib/python2.7/dist-packages.
In other words, even pips isolated by direnv and virtualenv are affected by environment variables, so
echo $PYTHONPATH
You can check if there is a strange path by executing. Is a lesson
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