One-Click Python 2→3 Conversion: Using 2to3 and a Registry Hack

Running Python 2 code directly in a Python 3 environment raises errors, and manually fixing many scripts is tedious.

The built‑in 2to3.py tool can automatically translate Python 2 source to Python 3. It resides in the Python installation under Tools\Scripts\2to3.py.

To convert a script, open a command prompt, navigate to the script’s directory and run: 2to3.py -w transform.py Without the -w flag the changes are only displayed; with -w they are written back to the original file.

For a one‑click solution, create a registry file named python 2to3.reg with the following content and double‑click it to import:

Windows Registry Editor Version 5.00
[HKEY_CLASSES_ROOT\Python.File\Shell\editwithidle\shell\2to3\command]
@="cmd /c C:\Users\Administrator\AppData\Local\Programs\Python\Python36-32\Tools\scripts\2to3.py -w \"%1\""

After importing, right‑click any .py file and you’ll see a “2to3” menu item. Selecting it runs the conversion automatically, updating the file to Python 3 syntax.