file_name = re.sub(r'D', "_", str(before_write_time))控制微秒显示位数(默认6位)
datetime.datetime.now().strftime('%H:%M:%S:%f')[:-3]

file_name = re.sub(r'D', "_", str(before_write_time))控制微秒显示位数(默认6位)
datetime.datetime.now().strftime('%H:%M:%S:%f')[:-3]