When it comes to Python on macOS, the only version that’s installed by default is the deprecated copy of Python 2.7 that’s slated to be removed in the future. For Python 3, you need to install the developer tools. (/usr/bin/python3 ships with the OS, but is just a stub that runs the developer tools version if installed or prompts you to install it otherwise).
It’s not hard to install, but it’s not guaranteed to already be installed on every system.
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When it comes to Python on macOS, the only version that’s installed by default is the deprecated copy of Python 2.7 that’s slated to be removed in the future. For Python 3, you need to install the developer tools. (/usr/bin/python3 ships with the OS, but is just a stub that runs the developer tools version if installed or prompts you to install it otherwise).
It’s not hard to install, but it’s not guaranteed to already be installed on every system.