How to solve the problem that python is not an internal or external command or a runnable program or batch file?

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Problem description

Cause analysis

Add Python 3.9 to PATH is not checked when installing Python

Solution one

Uninstall and reinstall, remember to check Add Python 3.9 to PATH when reinstalling

Option 2

The translation of Add Python 3.9 to PATH means to add Python to the environment variable. Since it was not added during installation, we can add it manually.

1. Right-click the computer and click Properties

2. Click Advanced system Settings

3. Click the environment variable

4. Double-click Path in the user variable

5. Click New, add your Python installation path and the Scripts path under the installation path, and finally click OK.

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