code: def valid(self, inplace=False, **kwargs):
          
          warnings.warn("Method .valid will be removed in a future version. "
                        "Use .dropna instead.", FutureWarning, stacklevel=2)
          return self.dropna(inplace=inplace, **kwargs)
docs: Return Series without null values.
  
          .. deprecated:: 0.23.0
              Use :meth:`Series.dropna` instead.