Upgrade Error pip effective solutions ImportError: can not import name 'main'

This problem is usually a pip from 9.xx version upgrade to a higher cause, mainly because there are modified but not updated after the upgrade file pip pip API function. The method as described hereafter change pip file.

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According to the code hints file path editing error pip

For example, my path is / usr / bin / pip (pip2 and pip3 corresponding path is pip2, pip3)

sudo gedit /usr/bin/pip

File open as follows

#!/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())
    

Modify the code the third line and the last line:

#!/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._internal import main
if __name__ == '__main__':
    sys.exit(main.main())
    

Run directly after saving

pip --version

That success without error

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