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# http://stackoverflow.com/questions/739654/how-to-make-a-chain-of-function-decorators-in-python?rq=1
def shout(word="yes"):
    return word.capitalize()+"!"

print(shout())
# outputs : 'Yes!'

# As an object, you can assign the function to a variable like any other object 
scream = shout

# Notice we don't use parentheses: we are not calling the function, we are putting the function "shout" into the variable "scream". It means you can then call "shout" from "scream":

print(scream())
# outputs : 'Yes!'

# More than that, it means you can remove the old name 'shout', and the function will still be accessible from 'scream'

del shout
try:
    print(shout())
except NameError, e:
    print(e)
    #outputs: "name 'shout' is not defined"

print(scream())
# outputs: 'Yes!'