throttling decorator

throttle.py

import datetime
from functools import wraps

def total_seconds(td):
    return (td.microseconds + (td.seconds + td.days * 24 * 3600) * 10**6) / 10.0**6

def throttle(time):
    def _throttle(f):
        f.time = time
        f.time_since_last = datetime.datetime.now() - datetime.timedelta(seconds = time)
        def wrapped(*args, **kwargs):
            if time < total_seconds(datetime.datetime.now() - f.time_since_last):
                f.time_since_last = datetime.datetime.now()
                return f(*args, **kwargs)
            else:
                return None
        return wrapped
    return _throttle