How to switch Python versions in Terminal

Question

My Mac came with Python 2 7 installed by default  but I d like to use Python 3 6 1 instead   How can I change the Python version used in Terminal  on Mac OS    Please explain clearly and offer no third party version manager suggestions

User · Answer

If you have python various versions of python installed you can launch any of them using pythonx x x where x x x represents your versions

User · Answer

As Inian suggested  you should alias python to point to python 3  It is very easy to do  and very easy to switchback  personally i have an alias setup for p2 python2 and p3 python3 as well to save on keystrokes  Read here for more information  How do I create a Bash alias   Here is an example of doing so for python   alias python python3   Like so     python --version Python 2 7 6   python3 --version Python 3 4 3   alias python python3   python --version Python 3 4 3   See here for the original  https   askubuntu com questions 320996 how-to-make-python-program-command-execute-python-3

User · Answer

The simplest way would be to add an alias to python3 to always point to the native python installed  Add this line to the  bash profile file in your  HOME directory at the last   alias python  python3    Doing so makes the changes to be reflected on every interactive shell opened

User · Answer

pyenv is a 3rd party version manager which is super commonly used  18k stars  1 6k forks  and exactly what I looked for when I came to this question   Install pyenv   Usage    pyenv install --list Available versions    2 1 3           3 8 1   3 9-dev   activepython-2 7 14   activepython-3 5 4   activepython-3 6 0   anaconda-1 4 0        a lot more  including anaconda  miniconda  activepython  ironpython  pypy  stackless           pyenv install 3 8 1 Downloading Python-3 8 1 tar xz    - gt  https   www python org ftp python 3 8 1 Python-3 8 1 tar xz Installing Python-3 8 1    Installed Python-3 8 1 to  home moose  pyenv versions 3 8 1    pyenv versions   system  set by  home moose  pyenv version    2 7 16   3 5 7   3 6 9   3 7 4   3 8-dev    python --version Python 2 7 17   pip --version pip 19 3 1 from  home moose  local lib python3 6 site-packages pip  python 3 6     mkdir pyenv-experiment  amp  amp  echo  3 8 1   gt   pyenv-experiment  python-version    cd pyenv-experiment    python --version Python 3 8 1   pip --version pip 19 2 3 from  home moose  pyenv versions 3 8 1 lib python3 8 site-packages pip  python 3 8

User · Answer

I have followed the below steps in Macbook   Open terminal type nano    bash profile and enter Now add the line alias python python3 Press CTRL   o to save it  It will prompt for file name Just hit enter and then press CTRL   x  Now check python version by using the command   python --version

User · Answer

You can just specify the python version when running a program   for python 2   python filename py   for python 3   python3 filename py

User · Answer

Here is a nice and simple way to do it  but on CENTOS   without braking the operating system   yum install scl-utils   next  yum install centos-release-scl-rh   And lastly you install the version that you want  lets say python3 5  yum install rh-python35   And lastly   scl enable rh-python35 bash   Since MAC-OS is a unix operating system  the way to do it it should be quite similar

[python] How to switch Python versions in Terminal?

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