In Ubuntu, after upgrading PIP3, there is an error of importerror: cannot import name ‘main’ when using PIP3. This article describes how to correct this error, pro test effective

Install python3:

sudo apt install python3

Install PIP3:

sudo apt install python3-pip

Upgrade PIP3:

python3 -m pip install –upgrade pip

Then when using PIP3 to install other modules, the error of importerror: cannot import name ‘main’ appears

The fix is to modify the file/usr/bin/PIP3

Here is the original content of this document:

from pip import main  
if __name__ == '__main__':  
    sys.exit(main()) 

Obviously, the main function was modified after PIP3 upgrade

Now modify this file as follows:

from pip import __main__  //must modify
if __name__ == '__main__':  
    sys.exit(__main__._main())//add __main__._

After saving, and then using PIP3, everything is normal

~$ pip3 –version
pip 19.0.3 from /home/xinlin/.local/lib/python3.6/site-packages/pip (python 3.6)

I don’t know why, when installing python3, the version of the built-in PIP3 is so low. If you change it to a higher version, many people won’t face this problem

another method is to reconstruct the symbolic connection of/usr/bin/PIP3

Using python3 – M pip or python3 – M site — user base, you can see where PIP3 is installed and rebuild the symbolic connection (How to create symbolic links)