Click on installed python-2.7.17.amd64.msi and follow these steps.
In above window select "Add python.exe to Path" as shown:
Test installation:
C:\Users\Joe>python
Python 2.7.17 (v2.7.17:c2f86d86e6, Oct 19 2019, 21:01:17) [MSC v.1500 64 bit (AMD64)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> exit()
C:\Users\Joe>