code: def _maybe_convert_usecols(usecols):
      
      if usecols is None:
          return usecols
  
      if is_integer(usecols):
          warnings.warn(("Passing in an integer for `usecols` has been "
                         "deprecated. Please pass in a list of int from "
                         "0 to `usecols` inclusive instead."),
                        FutureWarning, stacklevel=2)
          return lrange(usecols + 1)
  
      if isinstance(usecols, str):
          return _range2cols(usecols)
  
      return usecols
docs: Convert `usecols` into a compatible format for parsing in `parsers.py`.
  
      Parameters
      ----------
      usecols : object
          The use-columns object to potentially convert.
  
      Returns
      -------
      converted : object
          The compatible format of `usecols`.