python run program with processes code example

Example 1: run python file using python code

exec(open('file.py').read())

Example 2: how to run python in terminal

#For Python 3:
$ python3 helloworld.py
#For Python 2:
$ python helloworld.py

Example 3: how to run python program

move to the directory where your program lies 
open cmd 
python first_script.py(your file name)