How Can I Make Python 3.x the Default Version on macOS?

Setting Python 3.x as the Default Version on macOS X

Many software applications rely on Python 2.7, which is often the default version on macOS X. However, you may prefer to use Python 3.x for modern features and security updates. Here's how to modify the default Python version system-wide:

Consider Potential Impacts

Changing the default Python executable can potentially disrupt applications dependent on Python 2. To avoid this, use the following approach:

Creating an Alias

Bash or zsh shells (default in macOS) support aliasing commands. Add the following line to your ~/.profile file:

alias python='python3'

Sourcing the Alias

To activate the alias in your shells, source ~/.profile from your ~/.bash_profile or ~/.zsh_profile:

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

Using the Alias

After sourcing the alias, the $python command will now execute Python 3.3. To invoke Python 2, use the $python2 command.

Additional Aliases for Interpreter Usage

If desired, create additional aliases for quick interpreter access:

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

Shebang for Python Executables

In scripts, consider using explicit shebangs for Python 3 executables:

#!/usr/bin/env python3

Instead of:

#!/usr/bin/env python

This ensures the system uses Python 3 when executing Python executables.

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