mix.py 文件源码

def data_freq(time_series):
    """
    Determine frequency of given time series

    Args:
        time_series (Series): Series with datetime index

    Returns:
        string: frequency specifier
    """
    try:
        freq = time_series.index.freq
        return freq.freqstr or pd.infer_freq(time_series.index)
    except AttributeError:
        return pd.infer_freq(time_series.index)