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Created February 17, 2016 20:32
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Multiple Python installations on OS X
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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.

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