1There is no python3.exe file, that is why it fails.
2
3Try:
4
5py
6
7instead.
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9py 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
10
11py -2 or py -3
1Did you add python to PATH when you downloaded it?
2If not, redownload it and make sure you tick the box that says 'add Python to PATH'.
1If when executing the python program you get this error, simply replace the word "python" with "py"
2Instead of python first.py
3Write py first.py