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Type python for the REPL, or run pip install requests. Real CPython, no signup, ~7 MB first load.
Full CPython 3.13 via Pyodide. imports, classes, async — anything Python 3 can do runs here.
Type `pip install numpy pandas` and it works. Any pure-Python package + most C-extension packages on PyPI.
`ls`, `cat`, `mkdir`, `touch`. Files persist for the session. Save a `.py` file and run it with `python script.py`.