<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:

def iter_init(self) :
        "creates an iterator for extracting the arguments of the Message."
        iter = self.ExtractIter(None)
        if dbus.dbus_message_iter_init(self._dbobj, iter._dbobj) == 0 :
            iter._nulliter = True
        #end if
        return \
             iter