def _maybe_convert_usecols(usecols):
if usecols is None:<EOL><INDENT>return usecols<EOL><DEDENT>if is_integer(usecols):<EOL><INDENT>warnings.warn(("<STR_LIT>"<EOL>"<STR_LIT>"<EOL>"<STR_LIT>"),<EOL>FutureWarning, stacklevel=<NUM_LIT:2>)<EOL>return lrange(usecols + <NUM_LIT:1>)<EOL><DEDENT>if isinstance(usecols, str):<EOL><INDENT>return _range2cols(usecols)<EOL><DEDENT>return usecols<EOL>
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`.