How to link home brew python version and set it as default

Question

I just switched from MacPorts to HomeBrew  After installing all the required XCode versions and other software I tried installing python using homebrew  I think it successfully installed  but when I do which python it still shows me 2 7 3 which I think is the version shipped with Mountain Lion    which python  usr local bin python  python --version Python 2 7 3   so I tried to install again  brew install python --framework --universal Warning  python-2 7 5 already installed  it s just not linked   But it says python 2 7 5 already install and not linked  I tried to do brew link python   That led me to following message so  I have no idea what I should be doing    Linking  usr local Cellar python 2 7 5    Warning  Could not link python  Unlinking     Error  Could not symlink file   usr local Cellar python 2 7 5 bin smtpd2 py Target  usr local bin smtpd2 py already exists  You may need to delete it  To force the link and overwrite all other conflicting files  do    brew link --overwrite formula name  To list all files that would be deleted    brew link --overwrite --dry-run formula name

User · Answer

I use these commands to solve it   mkdir  usr local lib mkdir  usr local lib pkgconfig brew link python

User · Answer

You can follow these steps     python3 --version     brew unlink python 2   brew link python3      python3 --version

User · Answer

In the Terminal  type   brew link python

User · Answer

I think you have to be precise with which version you want to link with the command brew link python like   brew link python 3   It will give you an error like that    Linking  usr local Cellar python3 3 5 2     Error  Could not symlink bin 2to3-3 5 Target  usr local bin 2to3-3 5 already exists      You may want to remove it   rm   usr local bin 2to3-3 5    To force the link and overwrite all conflicting files   brew link --overwrite python3   To list all files that would be deleted   brew link --overwrite --dry-run python3   but you have to copy paste the command to force the link which is   brew link --overwrite python3   I think that you must have the version  the newer  installed

User · Answer

brew switch to python3 by default  so if you want to still set python2 as default bin python  running   brew unlink python  amp  amp  brew link python2 --force

User · Answer

If you used  brew install python   before  unlink  you got   brew info python  usr local Cellar python 2 7 11  python -V Python 2 7 10   so do   brew unlink python  amp  amp  brew link python   and open a new terminal shell   python -V Python 2 7 11

User · Answer

On OS X High Sierra  I had to do this    sudo install -d -o   whoami  -g admin  usr local Frameworks brew uninstall --ignore-dependencies python brew install python python --version   should work  returns 2 7  which is a Python thing  it s weird  but ok    credit to https   gist github com irazasyed 7732946 gistcomment-2235469  I think it s better than recursively chowning the  usr local dir  but that may solve other problems

User · Answer

The problem with me is that I have so many different versions of python  so it opens up a different python3 7 even after I did brew link  I did the following additional steps to make it default after linking  First  open up the document setting up the path of python   nano    bash profile   Then something like this shows up     Setting PATH for Python 3 7   The original version is saved in  bash profile pysave PATH   Library Frameworks Python framework Versions 3 7 bin   PATH   export PATH    Setting PATH for Python 3 6   The original version is saved in  bash profile pysave PATH   Library Frameworks Python framework Versions 3 6 bin   PATH   export PATH   The thing here is that my Python for brew framework is not in the Library Folder   So I changed the framework for python 3 7  which looks like follows in my system    Setting PATH for Python 3 7   The original version is saved in  bash profile pysave PATH   usr local Frameworks Python framework Versions 3 7 bin   PATH   export PATH   Change and save the file  Restart the computer  and typing in python3 7  I get the python I installed for brew   Not sure if my case is applicable to everyone  but worth a try  Not sure if the framework path is the same for everyone  please made sure before trying out

User · Answer

This answer is for upgrading Python 2 7 10 to Python 2 7 11 on Mac OS X El Capitan   On Terminal type   brew unlink python   After that type on Terminal   brew install python

User · Answer

After installing python3 with brew install python3 I was getting the error   Error  An unexpected error occurred during the  brew link  step The formula built  but is not symlinked into  usr local Permission denied   dir s mkdir -  usr local Frameworks Error  Permission denied   dir s mkdir -  usr local Frameworks   After typing brew link python3 the error was   Linking  usr local Cellar python 3 6 4 3    Error  Permission denied   dir s mkdir -  usr local Frameworks   To solve the problem   sudo mkdir -p  usr local Frameworks sudo chown -R   whoami   usr local   brew link python3   After this  I could open python3 by typing python3    From https   github com Homebrew homebrew-core issues 20985

[python] How to link home brew python version and set it as default

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