python datetime, timestamp，字符串类型时间之间的转换

import time
from datetime import datetime
from cffi.backend_ctypes import long

def str_to_datetime(time_str):
    '''
    把格式化的字符串类型的时间转换成datetime格式
    :param time_str: '2022-06-13 20:21:04.242'
    :return: datetime类型
    '''
    date_time = datetime.strptime(time_str, "%Y-%m-%d %H:%M:%S.%f")
    return date_time

def datetime_to_stamp(date_time):
    '''
    将datetime格式的时间（含毫秒）转为毫秒时间戳
    :param date_time: {datetime} '2022-06-13 20:21:04.242'
    :return: 13位的毫秒时间戳
    '''
    time_stamp = long(time.mktime(date_time.timetuple()) * 1000.0 + date_time.microsecond / 1000.0)
    return time_stamp

def time_str_to_stamp(time_str):
    '''
    把格式化的字符串类型的时间转换成13位的时间戳
    :param time_str: '2022-06-13 20:21:04.242'
    :return: 13位的毫秒时间戳
    '''
    date_time = str_to_datetime(time_str)
    time_stamp = datetime_to_stamp(date_time)
    return time_stamp

def stamp_to_time_str(stamp):
    '''
    把13位的时间戳转换为格式化的字符串类型的时间
    :param stamp:
    :return:
    '''
    str_time = datetime.fromtimestamp(stamp / 1000.0).strftime('%Y-%m-%d %H:%M:%S.%f')
    return str_time

if __name__ == '__main__':
    print(stamp_to_time_str(1655176900265))
    print(time_str_to_stamp('2022-06-09 10:37:30.122'))