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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def _maybe_convert_usecols(usecols):
 """ 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`. """

    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