[Ubuntu, python] solving “ImportError: cannot import name ‘main’”

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When I upgrade pip3 by typing sudo pip3 install -U pip and use the upgraded pip3, I get the error message ‘ImportError: cannot import name 'main'’. This is because a collision between pip3s installed by ubuntu and python3.

Here is solution.

First, you need to reverse pip3 back to previous version.

$ python3 -m pip uninstall pip --user && sudo apt install python3-pip --reinstall

Second, install pip3 via python3.

$ python3 -m pip install pip

Then, whenever you want to use pip3, use it as,

$ python3 -m pip 

For example,

$ python3 -m pip install -U scikit-image

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