Programming tutorials for people who want code that actually runs, not code that only looks right. Pick a language, start at the beginning, and don't skip the basics. They are where most problems come from.
Python is probably installed. Your terminal just can't find it. Check the three possible causes in order, fix the right one on Windows, Mac or Linux, and confirm which Python you're really running.
Trace a compiler version mismatch, confirm the resolved package path, and make a project-local check catch a deliberate type error.
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