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It means that either you haven’t installed Python 3.x on your system, or that Python’s installation binary folder isn’t in your PATH. Python’s installer should be able to add its installation’s folder to your PATH environment variable.
If you do have Python installed, and still encounter this error, then do the following steps:
- Right click on the start menu, go to System
- Click advanced system settings
- Click environment variables
- Select PATH and click on Edit…
- Click New and add Python’s installation binary folder to the list.
Source:stackexchange.com