how to set environment variable in windows 10 for python code example

Example 1: python path to python executable

>>> import sys
>>> print(sys.executable)
C:\path\to\python.exe

Example 2: python set windows environment variable

os.environ['API_PASSWORD'] = 'secret'

Example 3: add python to path windows 10

Either manually change it by doing the steps for the answer by skilliboi.

Or you can reinstall python and when you do that, make sure to tick the box that says:
Add python to PATH (or something like that)