code: def from_millis(cls, timeout_ms):
      
      if hasattr(timeout_ms, 'has_expired'):
        return timeout_ms
      if timeout_ms is None:
        return cls(None)
      return cls(timeout_ms / 1000.0)
docs: Create a new PolledTimeout if needed.
  
      If timeout_ms is already a PolledTimeout, just return it, otherwise create a
      new PolledTimeout with the given timeout in milliseconds.
  
      Args:
        timeout_ms: PolledTimeout object, or number of milliseconds to use for
          creating a new one.
  
      Returns:
        A PolledTimeout object that will expire in timeout_ms milliseconds, which
      may be timeout_ms itself, or a newly allocated PolledTimeout.