human
Here's a good function header given the following:
I wrote the below code

    def decorate(fn):
        def wrap(*args, **kw):
            with count_functions(variance=variance):
                return fn(*args, **kw)
        return update_wrapper(wrap, fn)
    return decorate

What's a good function header?
assistant
#Here's a good function header.

def function_call_count(variance=0.05):