code: def create_initial(self, address_values):
          
  
          with self._lock:
              for add, val in address_values:
                  self._state[add] = _ContextFuture(address=add, result=val)
docs: Create futures from inputs with the current value for that address
          at the start of that context.
  
          Args:
              address_values (list of tuple): The tuple is string, bytes of the
                  address and value.