How to write simple Python program using command prompt?
Steps:
1. open command prompt
2. type 'python' and hit 'Enter' key
3. type 2+2 and hit 'Enter' key :: you will see the output of the sum
4. type 'pring "some text"' and hit 'Enter' key:: you will see the output of the command
5. type 'exit()' and hit 'Enter' key to exit from the python mode