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

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

or without them (for instance to redirect the output to stderr by default):

@redirect_output def foo(): .... 

Is that at all possible?

Note that I'm not looking for a different solution to the problem of redirecting output, it's just an example of the syntax I'd like to achieve.