<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def _cancel_outstanding(self):
 """Cancel all of our outstanding requests"""

        for d in list(self._outstanding):
            d.addErrback(lambda _: None)  # Eat any uncaught errors
            d.cancel()