67     def add_result(self, future):  argument
70     def add_exception(self, future):  argument
73     def add_cancelled(self, future):  argument
83     def add_result(self, future):  argument
88     def add_exception(self, future):  argument
93     def add_cancelled(self, future):  argument
101     def add_result(self, future):  argument
105     def add_exception(self, future):  argument
109     def add_cancelled(self, future):  argument
128     def add_result(self, future):  argument
132     def add_exception(self, future):  argument
139     def add_cancelled(self, future):  argument