brew install python3 didn't install pip3

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青春惊慌失措
青春惊慌失措 2021-01-31 04:18

I installed python3 using homebrew but it didn\'t install pip3 or should I say it installed but it doesn\'t recognize the command ?

Here is what I did:

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  • 2021-01-31 04:43

    GitHub user @aether2501, commenting on a sudo chown solution for a "Homebrew Permission Denied" problem, suggests instead that Homebrew be uninstalled/reinstalled after the upgrade to High Sierra.

    I successfully used @aether2501's reinstall command, /usr/bin/ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)", on High Sierra (10.13.2) without uninstalling brew first.

    In addition to creating the /usr/local/Frameworks directory and setting the necessary ownership and permissions I needed to link python3, it also appears to have fixed other directory issues.

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  • 2021-01-31 04:44

    After resolving the linking issue (e.g. https://github.com/Homebrew/homebrew-core/issues/19286 ), python3 is installed but not pip3. Reinstalling python (e.g. brew reinstall python) eventually installs pip3 as well. These steps works well for me.

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  • 2021-01-31 04:54

    Ok it took me a lot of googling but the problem is that in high sierra all permissions inside usr/local changed and homebrew has to create some folder inside usr/local. Here is how I solved everything:

    I tried using sudo brew install python3 but that also threw an error directly from Homebrew telling me that it doesn't allow the use of sudo brew.

    Create the folders I needed using sudo mkdir inside /usr/local:

    sudo mkdir lib 
    sudo mkdir Frameworks
    

    Change the permissions inside /usr/local so that homebrew can access them:

    sudo chown -R $(whoami) $(brew --prefix)/*
    

    Now install python3

    brew install python3
    

    This will give you a successful installation:

    ==> Pouring python3-3.6.3.high_sierra.bottle.tar.gz
    ==> /usr/local/Cellar/python3/3.6.3/bin/python3 -s setup.py --no-user-cfg install --force --verbose --install-scripts=/usr/local/Cellar/python3/3.6.3/bin --in
    ==> /usr/local/Cellar/python3/3.6.3/bin/python3 -s setup.py --no-user-cfg install --force --verbose --install-scripts=/usr/local/Cellar/python3/3.6.3/bin --in
    ==> /usr/local/Cellar/python3/3.6.3/bin/python3 -s setup.py --no-user-cfg install --force --verbose --install-scripts=/usr/local/Cellar/python3/3.6.3/bin --in
    ==> Caveats
    Pip, setuptools, and wheel have been installed. To update them
      pip3 install --upgrade pip setuptools wheel
    
    You can install Python packages with
      pip3 install <package>
    
    They will install into the site-package directory
      /usr/local/lib/python3.6/site-packages
    
    See: https://docs.brew.sh/Homebrew-and-Python.html
    ==> Summary
                                                                        
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  • 2021-01-31 04:54

    In my case, this fixed the issue:

    brew unlink python@3.9; brew link python@3.9
    

    (You might have to replace the version number with the version you have installed)

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  • 2021-01-31 04:57

    I had the same issue and used:

    sudo -H pip3 install virtualenv
    sudo -H pip3 install virtualenvwrapper --ignore-installed six
    
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