code: def subtract_and_get(self, delta):
          '''
          Atomically subtracts `delta` from the current value.
  
          :param delta: The delta to subtract.
          '''
          with self._lock.exclusive:
              self._value -= delta
              return self._valuf subtract_and_get(self, delta):
          '''
          Atomically subtracts `delta` from the current value.
  
          :param delta: The delta to subtract.
          '''
          with self._lock.exclusive:
              self._value -= delta
              return self._value
docs: Atomically subtracts `delta` from the current value.
  
          :param delta: The delta to subtract.