freq_conversions.py 文件源码

def _filter_dates(dates, freq, kwargs):
    """
    This function filters dates to indicate end of periods for ordinals.
    """

    indicator = DATETIME_DICT[freq]

    if isinstance(indicator, str):
        # no special behavior
        indicators = np.fromiter(
            [date.__getattribute__(indicator) for date in dates],
            dtype=np.int32)

        return np.argwhere(indicators[1:] - indicators[:-1] > 0)

    else:
        # apply a function
        indicators = np.fromiter(
            [indicator(date, kwargs) for date in dates], dtype=np.int32)

        return np.argwhere(indicators[1:] - indicators[:-1] > 0)