Steps---

1 .Download Python -

click on the link

                https://www.python.org/downloads/

Follow same  link for other OS

install python and set path of your choice

Suggestion

     Use Sublime Or Pycham For Better Intraction  

           a.   I personally suggest you to Download these Softwares for better view to code,

                   I am using Sublime for making softwares . 

                   I am giving you link to download.

                                           https://www.sublimetext.com/3

                          https://www.jetbrains.com/pycharm-edu/download/#section=windows

2. Write Program 

             a.  Write your code on any of the suggested software.

             b.  Save program in a Directory you want with extension .Py [  example.Py ]

3. Open Window Powershell

          a:-   Press window key.

          b:-   Search Powershell .

          c:-   Go to the directory where you save Python code

           d:-  write python file name and extension

Hope it is helpful .... do share

Thank you