How Can I Set Python 3.x as the Default Python Interpreter on macOS?

Setting Python 3.x as Default on OS X

To run Python 3.3 instead of the default Python 2.7 version, you can use the following method:

Alias the Commands

In macOS, you can create an alias in your ~/.profile file to change the command's default behavior. Add the following line to your ~/.profile:

alias python='python3'

Next, source the ~/.profile file in your ~/.bash_profile or ~/.zsh_profile using:

[ -e ~/.profile ] && . ~/.profile

This makes the alias available in all shells.

Invoke Python 2 with "python2"

With the alias in place, the "python" command will execute Python 3. If you need to invoke Python 2 on occasion, you can use the "python2" command, which leaves the alias untouched.

Additional Aliases

For convenience, you can create additional aliases for quick access to Python interpreters:

alias 2='python2'
alias 3='python3'

Tip for Scripts

Instead of using shebangs like "#!/usr/bin/env python," use "#!/usr/bin/env python3" in scripts. This ensures that Python 3 is used for running Python executables.

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