code: def get_and_set(self, value):
          '''
          Atomically sets the value to `value` and returns the old value.
  
          :param value: The value to set.
          '''
          with self._lock.exclusive:
              oldval = self._value
              self._value = value
              return oldvaf get_and_set(self, value):
          '''
          Atomically sets the value to `value` and returns the old value.
  
          :param value: The value to set.
          '''
          with self._lock.exclusive:
              oldval = self._value
              self._value = value
              return oldval
docs: Atomically sets the value to `value` and returns the old value.
  
          :param value: The value to set.