How can I install a previous version of Python 3 in macOS using homebrew

Question

How can I install a previous version of Python 3 in macOS using brew   With the command brew install python I got the latest version of Python 3  currently v3 7 0   but I want the last version of Python 3 6  currently 3 6 5    I have read about another package pyenv that can assist in handle different python installation  but this solution is not suitable for me

User · Answer

To solve this with homebrew  you can temporarily backdate homebrew-core and set the HOMEBREW NO AUTO UPDATE variable to hold it in place   cd  brew --repo homebrew core  git checkout f2a764ef944b1080be64bd88dca9a1d80130c558 export HOMEBREW NO AUTO UPDATE 1 brew install python   I don t recommend permanently backdating homebrew-core  as you will miss out on security patches  but it is useful for testing purposes   You can also extract old versions of homebrew formulae into your own tap  tap owner tap name  using the brew extract command   brew extract python tap owner tap name --version 3 6 5

User · Answer

Short Answer  To make a clean install of Python 3 6 5 use   brew unlink python   ONLY if you have installed  with brew  another version of python 3 brew install --ignore-dependencies https   raw githubusercontent com Homebrew homebrew-core f2a764ef944b1080be64bd88dca9a1d80130c558 Formula python rb   If you prefer to recover a previously installed version  then   brew info python             To see what you have previously installed brew switch python 3 x x x   Ex  3 6 5 1   Long Answer  There are two formulas for installing Python with Homebrew  python 2 and python  The first is for Python 2 and the second for Python 3   Note  You can find outdated answers on the web where it is mentioned python3 as the formula name for installing Python version 3  Now it s just python   By default  with these formulas you can install the latest version of the corresponding major version of Python  So  you cannot directly install a minor version like 3 6   Solution  With brew  you can install a package using the address of the formula  for example in a git repository   brew install https   the address to the formula FORMULA NAME rb   Or specifically for Python 3  brew install https   raw githubusercontent com Homebrew homebrew-core COMMIT IDENTIFIER Formula python rb   The address you must specify is the address to the last commit of the formula  python rb  for the desired version  You can find the commint identifier by looking at the history for homebrew-core Formula python rb  https   github com Homebrew homebrew-core commits master Formula python rb  Python   3 6 5  In the link above you will not find a formula for a version of Python above 3 6 5  After the maintainers of that  official  repository released Python 3 7  they only submit updates to the recipe of Python 3 7   As explained above  with homebrew you have only Python 2  python 2  and Python 3  python   there is no explicit formula for Python 3 6   Although those minor updates are mostly irrelevant in most cases and for most users  I will search if someone has done an explicit formula for 3 6

User · Answer

What I did was first I installed python 3 7   brew install python3 brew unlink python   then I installed python 3 6 5 using above link   brew install --ignore-dependencies https   raw githubusercontent com Homebrew homebrew-core f2a764ef944b1080be64bd88dca9a1d80130c558 Formula python rb --ignore-dependencies   After that I ran brew link --overwrite python  Now I have all pythons in the system to create the virtual environments   mian tdowrick2    python --version Python 2 7 10 mian tdowrick2    python3 7 --version Python 3 7 1 mian tdowrick2    python3 6 --version Python 3 6 5   To create Python 3 7 virtual environment      mian tdowrick2    virtualenv -p python3 7 env Already using interpreter  Library Frameworks Python framework Versions 3 7 bin python3 7 Using base prefix   Library Frameworks Python framework Versions 3 7  New python executable in  Users mian env bin python3 7 Also creating executable in  Users mian env bin python Installing setuptools  pip  wheel    done  mian tdowrick2    source env bin activate  env  mian tdowrick2    python --version Python 3 7 1  env  mian tdowrick2    deactivate   To create Python 3 6 virtual environment      mian tdowrick2    virtualenv -p python3 6 env Running virtualenv with interpreter  usr local bin python3 6 Using base prefix   usr local Cellar python 3 6 5 1 Frameworks Python framework Versions 3 6  New python executable in  Users mian env bin python3 6 Not overwriting existing python script  Users mian env bin python  you must use  Users mian env bin python3 6  Installing setuptools  pip  wheel    done  mian tdowrick2    source env bin activate  env  mian tdowrick2    python --version Python 3 6 5  env  mian tdowrick2

User · Answer

In case anyone face pip issue like below  pip is configured with locations that require TLS SSL  however the ssl module in Python is not available    The root cause is openssl 1 1 doesn   t support python 3 6 anymore  So you need to install old version openssl 1 0  here is the solution   brew uninstall --ignore-dependencies openssl brew install https   github com tebelorg Tump releases download v1 0 0 openssl rb

User · Answer

I have tried everything but could not make it work  Finally I have used pyenv and it worked directly like a charm   So having homebrew installed  juste do   brew install pyenv pyenv install 3 6 5   to manage virtualenvs   brew install pyenv-virtualenv pyenv virtualenv 3 6 5 env name   See pyenv and pyenv-virtualenv for more info   EDIT  2019 03 19   I have found using the pyenv-installer easier than homebrew to install pyenv and pyenv-virtualenv direclty   curl https   pyenv run   bash   To manage python version  either globally   pyenv global 3 6 5   or locally in a given directory   pyenv local 3 6 5

User · Answer

The easiest way for me was to install Anaconda  https   docs anaconda com anaconda install  There I can create as many environments with different Python versions as I want and switch between them with a mouse click  It could not be easier  To install different Python versions just follow these instructions https   docs conda io projects conda en latest user-guide tasks manage-python html A new development environment with a different Python version was done within 2 minutes  And in the future I can easily switch back and forth

User · Answer

As an update  when doing   brew unlink python   If you have installed  with brew  another version of python brew install https   raw githubusercontent com Homebrew homebrew-core f2a764ef944b1080be64bd88dca9a1d80130c558 Formula python rb   You may encounter  Error  python contains a recursive dependency on itself    python depends on sphinx-doc   sphinx-doc depends on python   To bypass it  add the --ignore-dependencies argument to brew install   brew unlink python   If you have installed  with brew  another version of python brew install --ignore-dependencies https   raw githubusercontent com Homebrew homebrew-core f2a764ef944b1080be64bd88dca9a1d80130c558 Formula python rb

User · Answer

I tried all the answers above to install Python 3 4 4  The installation of python worked  but PIP would not be installed and nothing I could do to make it work  I was using Mac OSX Mojave  which cause some issues with zlib  openssl   What not to do    Try to avoid using Homebrew for previous version given by the formula Python or Python3  Do not try to compile Python   Solution    Download the macOS 64-bit installer or macOS 64-bit 32-bit installer  https   www python org downloads release python-365  In previous step  it will download Python 3 6 5  if for example  you want to download Python 3 4 4  replace in the url above python-365 by python-344 Download click on the file you downloaded a GUI installer will open If you downloaded python-365  after installation  to launch this version of python  you will type in your terminal python365  same thing for pip  it will be pip365   p s  You don t have to uninstall your other version of Python on your system     Edit     I found a much much much better solution that work on MacOSX  Windows  Linux  etc    It doesn t matter if you have already python installed or not  Download Anaconda Once installed  in terminal type  conda init In terminal create virtual environment with any python version  for example  I picked 3 4 4  conda create -n  NameOfYour VirtualEnvironment  python 3 4 4 Then  in terminal  you can check all the virtual environment you ahave created with the command  conda info --envs Then  in terminal  activate the virtual environment of your choice with  conda activate  The name of your virtual environment that was shown with the command at step 5

[python] How can I install a previous version of Python 3 in macOS using homebrew?

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