Simple python decorator.

python_decorator.py

#!/usr/bin/env python

session = False

def login_required(fn):
    def ok(input):
        if(session == True):
            data = "welcome dear %s" % input
        else:
            data = "you are not logged in"    
        return data
    return ok


@login_required
def index(inputs):
    return inputs

def login():
    global session
    session = True

login()
print index("morteza")