python - How to make a chain of function decorators?

How can I make two decorators in Python that would do the following?

@makebold
@makeitalic
def say():
   return "Hello"

...which should return:

"Hello"

I'm not trying to make HTML this way in a real application - just trying to understand how decorators and decorator chaining works.

Answer

Check out the documentation to see how decorators work. Here is what you asked for:

from functools import wraps


def makebold(fn):
    @wraps(fn)
    def wrapped(*args, **kwargs):
        return "" + fn(*args, **kwargs) + ""
    return wrapped

def makeitalic(fn):
    @wraps(fn)
    def wrapped(*args, **kwargs):
        return "" + fn(*args, **kwargs) + ""

    return wrapped

@makebold
@makeitalic
def hello():
    return "hello world"

@makebold
@makeitalic
def log(s):

    return s

print hello()        # returns "hello world"
print hello.__name__ # with functools.wraps() this returns "hello"
print log('hello')   # returns "hello"