python3' is not recognized as an internal or external command, code example
Example: 'python3' is not recognized as an internal or external command,
There is no python3.exe file, that is why it fails.
Try:
py
instead.
py is just a launcher for python.exe. If you have more than one python versions installed on your machine (2.x, 3.x) you can specify what version of python to launch by
py -2 or py -3