pip: Could not find an activated virtualenv (required)

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Open your ~/.bashrc file and see if this line is there – 

export PIP_REQUIRE_VIRTUALENV=true

It might be causing the trouble. If it’s there, change it to false and run – 

source ~/.bashrc

If not, run export PIP_REQUIRE_VIRTUALENV=false from terminal.

Note: everything works the same if you have .bash_profile instead of .bashrc in your current user’s root directory.

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