It enables Python scripts to specify the version of Python which should be used.
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Python Launcher is an open-source program that allows Python scripts (.py and .pyw files) on Windows to specify the version of Python which should be used, allowing simultaneous use of Python 2 and 3. When executing a script, the launcher looks for a Unix-style #!
(shebang) line in the script. It recognizes executable names python (system default python), python2 (default Python 2 release) and python3 (default Python 3 release).
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