Method _get_wom_rule

pandas/tseries/frequencies.py:414–429

(self)

        )

    def _get_wom_rule(self) -> str | None:
        weekdays = unique(self.index.weekday)
        if len(weekdays) > 1:
            return None

        week_of_months = unique((self.index.day - 1) // 7)
        # Only attempt to infer up to WOM-4. See #9425
        week_of_months = week_of_months[week_of_months < 4]
        if len(week_of_months) == 0 or len(week_of_months) > 1:
            return None

        # get which week
        week = week_of_months[0] + 1
        wd = int_to_weekday[weekdays[0]]

        return f"WOM-{week}{wd}"


class _TimedeltaFrequencyInferer(_FrequencyInferer):