ubuntu16 升級pip3後報錯File "/usr/bin/pip3", line 9, in <module> from pip import main ImportError: cannot import name 'main'

問題：ubuntu16 執行pip3 install --upgrade pip之後，pip3執行出錯。

Traceback (most recent call last):

File "/usr/bin/pip3", line 9, in <module>
from pip import main
ImportError: cannot import name 'main'

截圖如下：

問題解決方法：

sudo vi /usr/bin/pip3為下麵的代碼：

#!/usr/bin/python3
# GENERATED BY DEBIAN

import sys

# Run the main entry point, similarly to how setuptools does it, but because
# we didn't install the actual entry point from setup.py, don't use the
# pkg_resources API.
from pip import __main__
if __name__ == '__main__':
    sys.exit(__main__._main())