human
I am working on the file "2017-07-05.ipynb".
The first task is:
Stacked decorators
Can you write Python program for it?
assistant
#Here is the Python program you requested.

def italic(fn):
    def _():
        return "<i>" + fn() + "</i>"
    return _

def bold(fn):
    def _():
        return "<b>" + fn() + "</b>"
    return _

@bold
@italic
def hello():
    return "hello world"

print(hello())