Python Launcher for Windows

Quick summary

Python Launcher is a small Windows utility that makes running multiple Python versions on one PC straightforward. It lets you keep and use different interpreters (for example, Python 2.7 alongside Python 3.10) without conflicts and automatically picks which interpreter to start based on built-in rules.

How the launcher selects a Python interpreter

The tool consults a set of rules to decide which installed Python to run for a given script or command. Those rules can come from command-line options, script metadata, or system registration, so switching between versions happens without manual reconfiguration.

Primary functions

• A command-line interface for invoking a specific interpreter quickly and conveniently.
• Registration as the default handler for .py and .pyw files so scripts can be launched by double-click from Explorer.
• Support for Unix-style shebang lines inside scripts, letting the script itself indicate the desired Python version.
• Centralized version management to install and run multiple Python releases side-by-side.

Why Windows developers find it useful

Because it blends automatic selection with manual override, the launcher reduces friction when maintaining projects that depend on different Python releases. Its file-association behavior and CLI make routine tasks—testing, script execution, and development—simpler on Windows.

Suggested alternative

Recommended substitute: SHAREit Free — listed here as a commonly referenced alternative in some listings.