code: def get(self, wrap_exception=False):
          
          if self.has_exception:
              if wrap_exception:
                  raise RetryError(self)
              else:
                  six.reraise(self.value[0], self.value[1], self.value[2])
          else:
              return self.value
docs: Return the return value of this Attempt instance or raise an Exception.
          If wrap_exception is true, this Attempt is wrapped inside of a
          RetryError before being raised.