code: def set_result(self, result, from_tree=False):
          
  
          if self._read_only:
              if not from_tree:
                  LOGGER.warning("Tried to set address %s on a"
                                 " read-only context.",
                                 self.address)
              return
  
          with self._condition:
              if self._read_only:
                  if not from_tree:
                      LOGGER.warning("Tried to set address %s on a"
                                     " read-only context.",
                                     self.address)
                  return
              if from_tree:
                  # If the result has not been set in the context, overwrite the
                  # value with the value from the merkle tree. Otherwise, do
                  # nothing.
                  if not self._result_set_in_context:
                      self._result = result
                      self._tree_has_set = True
              else:
                  self._result = result
                  self._result_set_in_context = True
                  self._deleted = False
  
              self._condition.notify_all()
docs: Set the addresses's value unless the future has been declared
          read only.
  
          Args:
              result (bytes): The value at an address.
              from_tree (bool): Whether the value is being set by a read from
                  the merkle tree.
  
          Returns:
              None