How to use Python’s py launcher for Windows

The Windows version of the Python interpreter can be run from the command line the same way it’s run in other operating systems, by typing python or python3 at the prompt. But there’s a feature unique to the Python edition of Windows that makes it easier to manage multiple installed versions of the Python interpreter—the py launcher.

The py launcher—or just py for short—is a shortcut to all of the installed versions of Python on one’s system. With a command-line switch, you see at a glance all of the Python interpreters you’ve installed, and invoke a specific version of Python, whether 32-bit or 64-bit.

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