Different ways to start Python

If you have different versions of python on windows you could start python in the cmd (bash) of windows writing:

python

py -3

py -3.4

py -2.7

When you install python there is an option to check to include python in the path.

If you don't check it you can go in the system and add it in the advanced system settings in the system variables.

In the system variables you have to choose the path variable and add the C:\python36 value to the list of value, for example.

anyway... there is still this way to start a specific python version from the command line, indicating the full path of python:
c:\python34\python.exe

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Pythoprogs aka Python programs

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