dec_with_arguments.py

import inspect

def decorator_wrapper(parameter):
    print parameter
    
    def decorator(func):
        def wrapper(message):
            print "Wrapper start"
            func(message)
            print "Wrapper end"
            
        return wrapper
        
    return decorator
            

# Here, instead of having the decorator function object as in prevision cases,
# we are executing the decorator_wrapper function using the round brackets which returns the
# decorator function. So ultimately the code changes to 
'''
decorator = decorator_wrapper("Decorator paramerter")

@decorator
def say_hello(message):
    print message
'''
@decorator_wrapper("Decorator parameter")            
def say_hello(message):
    print message


print inspect.getsource(say_hello)
'''
    def wrapper(message):
        print "Wrapper start"
        func(message)
        print "Wrapper end"
'''

say_hello("Hello, world")