Question

when double click on a .py file , a command window opens up and goes awy in a fraction of a second .
How should i see whats the code written inside of the .py file?

Answer 1

Double clicking it will run the file and the command window closes when done. To view the contents you can open it in python's Idle or a text editor like notepad++ or wordpad. To see the output you can run it in Idle or open a command prompt and run it from there.

Answer 2

right click the python file and click edit with python

Answer 3

right click on the python file and click edit with IDLE