def user_agents(self):
return (self.get_query()<EOL>.select(<EOL>PageView.headers['<STR_LIT>'],<EOL>fn.Count(PageView.id))<EOL>.group_by(PageView.headers['<STR_LIT>'])<EOL>.order_by(fn.Count(PageView.id).desc())<EOL>.tuples())<EOL>
Retrieve user-agents, sorted by most common to least common.