Python Launcher for Windows Version %s usage: %s [launcher-args] [python-args] [script [script-args]] Launcher arguments: -2 : Launch the latest Python 2.x version -3 : Launch the latest Python 3.x version -X.Y : Launch the specified Python version The above default to an architecture native runtime, but will select any available. Add a "-32" to the argument to only launch 32-bit runtimes, or add "-64" to omit 32-bit runtimes (this latter option is deprecated). To select a specific runtime, use the -V: options. -V:TAG : Launch a Python runtime with the specified tag -V:COMPANY/TAG : Launch a Python runtime from the specified company and with the specified tag -0 --list : List the available pythons -0p --list-paths : List with paths If no options are given but a script is specified, the script is checked for a shebang line. Otherwise, an active virtual environment or global default will be selected. See https://docs.python.org/using/windows.html#python-launcher-for-windows for additional configuration. The following help text is from Python: