Imran Imran - 2 months ago 7
Python Question

How to make a chain of function decorators in Python?

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

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


...which should return:

"<b><i>Hello</i></b>"


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:

def makebold(fn):
    def wrapped():
        return "<b>" + fn() + "</b>"
    return wrapped

def makeitalic(fn):
    def wrapped():
        return "<i>" + fn() + "</i>"
    return wrapped

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

print hello() ## returns "<b><i>hello world</i></b>"
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