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使用time模块的strftime()方法, 分割符可以自己定, 比如-, :, 空格

import time
t = time.strftime("%Y-%m-%d %H:%M:%S")
print(t)
'''
输出:2019-12-09 20:02:14
'''

strftime()中各个字母的含义

年   %Y  Year with century as a decimal number.
    月   %m  Month as a decimal number [01,12].
    日   %d  Day of the month as a decimal number [01,31].
    小时  %H  Hour (24-hour clock) as a decimal number [00,23].
    分钟  %M  Minute as a decimal number [00,59].
    秒   %S  Second as a decimal number [00,61].
    时区  %z  Time zone offset from UTC.
    %a  Locale's abbreviated weekday name.
    %A  Locale's full weekday name.
    %b  Locale's abbreviated month name.
    %B  Locale's full month name.
    %c  Locale's appropriate date and time representation.
    小时(12小时制)%I  Hour (12-hour clock) as a decimal number [01,12].
    %p  Locale's equivalent of either AM or PM.