human
I wrote the below code

    def decorator(func):
        @wraps(func)
        def wrapper(*args, **kwargs):
            from django.core import validators
            original_open = validators.urllib2.OpenerDirector.open
            def custom_open(self, req, data=None, timeout=None):
                if (req.get_full_url() in existing_urls):
                    return True
                raise Exception()
            try:
                urllib2.OpenerDirector.open = custom_open
                func(*args, **kwargs)
            finally:
                validators.urllib2.OpenerDirector.open = original_open
        return wrapper
    return decorator

What's a good function header?

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

def verify_exists_urls(existing_urls=()):