open python file in terminal code example

Example 1: run python file using python code

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

Example 2: python how to run terminal command

#By Uku Loskit

import os
os.system("ls -l")

Example 3: how to run python in terminal

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

Example 4: python if run in terminal

import sys
if sys.stdin.isatty():
    # running interactively
    print "running interactively"
else:
    with open('output','w') as f:
        f.write("running in the background!\n")

Example 5: to run python script in terminal i want to type python insted of python3

$ python --version
Python 2.7.6
$ python3 --version
Python 3.4.3
$ alias python=python3
$ python --version
Python 3.4.3