def num_active_contributors(from_date, to_date=None, locale=None, product=None):
 return len(_active_contributors_id(from_date, to_date, locale, product))

def num_active_contributors ( from_date , to_date = None , locale = None , product = None ) : return len ( _active_contributors_id ( from_date , to_date , locale , product ) )
return number of active kb contributors for the specified parameters .