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Multiple Python installations on OS X

Previous versions used homebrew to install the various versions. As suggested in the comments, it's better to use pyenv instead. If you are looking for the previous version of this document, see the revision history.

$ brew update
$ brew install pyenv
$ pyenv install 3.5.0
$ pyenv install 3.4.3
$ pyenv install 3.3.6
$ pyenv install 3.2.6
$ pyenv install 2.7.10
$ pyenv install 2.6.9
$ pyenv versions
* system (set by /Users/bouke/.pyenv/version)
  2.6.9
  2.7.10
  3.2.6
  3.3.6
  3.4.3
  3.5.0

Then, when you need a certain version:

pyenv local 3.5.0

This will create a file .python-version, so pyenv will remember the Python version for this directory. This works also nice with tox, as you can activate many Python version at once. See the pyenv documentation for more information.

See also Using tox and pyenv for testing and development for a more detailed how-to.

@tmehlinger

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tmehlinger commented Dec 18, 2014

The Python 3.2 install will fail on newer versions of Homebrew because the formula is incompatible. I had to comment out lines 133-141 of Library/Formula/python3.rb and install Setuptools and Pip manually after the Python install finished.

Other than that, worked perfectly, thanks for taking the time to document this. :)

@IvanExpert

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IvanExpert commented Apr 5, 2015

Thanks for this writeup -- very helpful. Also thanks tmhlinger for your tip.

@Bouke

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Bouke commented Apr 7, 2015

The brew versions command has been removed. The instructions are no longer valid.

@zoidbergwill

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zoidbergwill commented Apr 30, 2015

This worked perfectly for me, I just skipped the brew versions line.

@tdsmith

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tdsmith commented Sep 14, 2015

I'm a Homebrew maintainer; I strongly suggest you use pyenv instead if you ever need anything but the most current Python versions. It's a much nicer solution in part because it's designed to handle switching scripts back and forth, which is very difficult for Homebrew to do.

@Bouke

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Bouke commented Sep 18, 2015

Thanks, I didn't know about pyenv, but found very useful already. I've updated the document as this looks like a better way to do this.

@denfromufa

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denfromufa commented Sep 28, 2016

The link is broken:

Using tox and pyenv for testing and development
http://tbb.co/using-tox-and-pyenv-for-testing-and-development/

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denfromufa commented Sep 28, 2016

I believe the new link is now here:

http://www.holger-peters.de/using-pyenv-and-tox.html

@Bouke

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Bouke commented Sep 28, 2016

Thanks @denfromufa, I've updated the link.

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matinfo commented Mar 20, 2017

Good to know, to not use default Python of OSX Sierra:

Add to your shell (~/.bashrc or ~/.zshrc) :

export PATH="/Users/username/.pyenv:$PATH"
eval "$(pyenv init -)"

Remplace username by your MacBook user.
Refresh your terminal env, example: $ source ~/.zshrc (or restart your terminal)

@yanpeng

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yanpeng commented Jun 8, 2017

@matinfo it saves me :-)

@devhero

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devhero commented Jun 12, 2017

@matinfo

Can also works using shims (pyenv doc):

export PATH="/shims:$PATH"
eval "$(pyenv init -)"

@gino8080

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gino8080 commented Dec 3, 2017

great thankyou!

@Yammmy

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Yammmy commented Mar 3, 2018

Nice work~

@nachozt

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nachozt commented Mar 8, 2018

Thanks!!

@adlersantos

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adlersantos commented Jun 5, 2018

Thank you guys!

@danishbacker

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danishbacker commented Aug 20, 2018

Thank you 👍

@cindyloo

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cindyloo commented Aug 27, 2018

yes, very helpful!

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crapthings commented Feb 14, 2019

pyenv install 3.7.2
python-build: use openssl from homebrew
python-build: use readline from homebrew
Downloading Python-3.7.2.tar.xz...
-> https://www.python.org/ftp/python/3.7.2/Python-3.7.2.tar.xz
Installing Python-3.7.2...
python-build: use readline from homebrew

BUILD FAILED (OS X 10.14.3 using python-build 20180424)

Inspect or clean up the working tree at /var/folders/g_/9zn58k_16m50w1z3tqvq65xr0000gn/T/python-build.20190214115852.93619
Results logged to /var/folders/g_/9zn58k_16m50w1z3tqvq65xr0000gn/T/python-build.20190214115852.93619.log

Last 10 log lines:
File "/private/var/folders/g_/9zn58k_16m50w1z3tqvq65xr0000gn/T/python-build.20190214115852.93619/Python-3.7.2/Lib/ensurepip/main.py", line 5, in
sys.exit(ensurepip.main())
File "/private/var/folders/g
/9zn58k_16m50w1z3tqvq65xr0000gn/T/python-build.20190214115852.93619/Python-3.7.2/Lib/ensurepip/init.py", line 204, in main
default_pip=args.default_pip,
File "/private/var/folders/g
/9zn58k_16m50w1z3tqvq65xr0000gn/T/python-build.20190214115852.93619/Python-3.7.2/Lib/ensurepip/init.py", line 117, in _bootstrap
return _run_pip(args + [p[0] for p in PROJECTS], additional_paths)
File "/private/var/folders/g
/9zn58k_16m50w1z3tqvq65xr0000gn/T/python-build.20190214115852.93619/Python-3.7.2/Lib/ensurepip/init.py", line 27, in _run_pip
import pip._internal
zipimport.ZipImportError: can't decompress data; zlib not available
make: *** [install] Error 1

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LongBu commented Feb 20, 2019

@crapthings

Try the following:

CFLAGS="-I$(brew --prefix readline)/include -I$(brew --prefix openssl)/include -I$(xcrun --show-sdk-path)/usr/include" LDFLAGS="-L$(brew --prefix readline)/lib -L$(brew --prefix openssl)/lib" PYTHON_CONFIGURE_OPTS=--enable-unicode=ucs2 pyenv install -v 3.7.2

reference:
pyenv/pyenv#1219

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