The bug is found in pip 10.0.0.
In linux you need to modify file:
/usr/bin/pip from:
from pip import main
if __name__ == ‘__main__‘:
sys.exit(main())
to this:
from pip import __main__
if __name__ == ‘__main__‘:
sys.exit(__main__._main())
注:
原文:https://www.cnblogs.com/lemon-rain/p/9056139.html