62     def add_result(self, future):  argument
65     def add_exception(self, future):  argument
68     def add_cancelled(self, future):  argument
78     def add_result(self, future):  argument
83     def add_exception(self, future):  argument
88     def add_cancelled(self, future):  argument
96     def add_result(self, future):  argument
100     def add_exception(self, future):  argument
104     def add_cancelled(self, future):  argument
123     def add_result(self, future):  argument
127     def add_exception(self, future):  argument
134     def add_cancelled(self, future):  argument