def get_number_of_transitions(self):
        """
        Returns the numer of child states
        :return:
        """
        number_of_all_transitions = 0
        for s in self.states.values():
            number_of_all_transitions += s.get_number_of_transitions()
        return number_of_all_transitions + len(self.transitions)
Returns the numer of child states
        :return: