Python, listing the attributes of a parameter

This question may be a little green. In the example below, I am trying to find out a list of the attribtues from the "message" parameter. @respond_to("^meow") def remind_me_at(self, message): fre = "asd: %s " % str(message.sender) fre = "asd: %s " % str(message.mention_name) fren = "asd: %s " % str(message.sender.name) #fren = "hello, %s!" % str(message) self.say(fren, message=message) self.say(fre, message=message) As there is no documentation but the code is opensource, how can I find the file where the method is implemented efficiently; even if the class is in a library file.