@classmethod<EOL><INDENT>def _add_series_only_operations(cls):<DEDENT>
axis_descr, name, name2 = _doc_parms(cls)<EOL>def nanptp(values, axis=<NUM_LIT:0>, skipna=True):<EOL><INDENT>nmax = nanops.nanmax(values, axis, skipna)<EOL>nmin = nanops.nanmin(values, axis, skipna)<EOL>warnings.warn("<STR_LIT>"<EOL>"<STR_LIT>",<EOL>FutureWarning, stacklevel=<NUM_LIT:4>)<EOL>return nmax - nmin<EOL><DEDENT>cls.ptp = _make_stat_function(<EOL>cls, '<STR_LIT>', name, name2, axis_descr,<EOL>"""<STR_LIT>""",<EOL>nanptp)<EOL>
Add the series only operations to the cls; evaluate the doc
strings again.