How to create a Python decorator that can be used either with or without parameters?

Question

I\'d like to create a Python decorator that can be used either with parameters:

@redirect_output(\"somewhere.log\")
def foo():
    ....

or

Answer 1

Generally you can give default arguments in Python...

def redirect_output(fn, output = stderr):
    # whatever

Not sure if that works with decorators as well, though. I don't know of any reason why it wouldn't.