python 将一段时间拆分为小的时间段

import pandas as pd

def split_time_ranges(from_time, to_time, frequency):

    from_time, to_time = pd.to_datetime(from_time), pd.to_datetime(to_time)

    time_range = list(pd.date_range(from_time, to_time, freq='%sS' % frequency))

    if to_time not in time_range:

        time_range.append(to_time)

    time_range = [item.strftime("%Y-%m-%d %H:%M:%S") for item in time_range]

    time_ranges = []

    for item in time_range:

        f_time = item

        t_time = (datetime.datetime.strptime(item, "%Y-%m-%d %H:%M:%S") + datetime.timedelta(seconds=frequency))

        if t_time >= to_time:

            t_time = to_time.strftime("%Y-%m-%d %H:%M:%S")

            time_ranges.append([f_time, t_time])

            break

        time_ranges.append([f_time, t_time.strftime("%Y-%m-%d %H:%M:%S")])

    return time_ranges

if __name__ == '__main__':

    from_time = '2019-10-01 10:20:45'

    to_time = '2019-10-04 10:20:45'

    frequency = 60 * 60 * 5

    time_ranges = split_time_ranges(from_time, to_time, frequency)

    print(time_ranges)