Python strftime 与 strptime

strftime 

用于格式时间，反馈时间类型有自己定义的fmt 决定的

看下他的源码

def strftime(self, fmt: str) -> str: ...

里面就一个fmt，它的使用就是已知一个时间，然后使用strftime格式化时间。

strptime 也是格式化时间

看下他的源码

def strptime(string, format): # real signature unknown; restored from __doc__
    """
    strptime(string, format) -> struct_time
    
    Parse a string to a time tuple according to a format specification.
    See the library reference manual for formatting codes (same as
    strftime()).
    
    Commonly used format codes:
    
    %Y  Year with century as a decimal number.
    %m  Month as a decimal number [01,12].
    %d  Day of the month as a decimal number [01,31].
    %H  Hour (24-hour clock) as a decimal number [00,23].
    %M  Minute as a decimal number [00,59].
    %S  Second as a decimal number [00,61].
    %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.
    %I  Hour (12-hour clock) as a decimal number [01,12].
    %p  Locale's equivalent of either AM or PM.
    
    Other codes may be available on your platform.  See documentation for
    the C library strftime function.
    """
    return struct_time

这个就是里面一个string ，一个定义的fmt

import datetime
import time
now = datetime.datetime.now()
print(now)
date1 = now.strftime("%Y-%m-%d %H:%M:%S")
print(date1)
date2 = time.strptime("2023-11-15 17:24:20", "%Y-%m-%d %H:%M:%S")
print(date1)

打印结果

2023-11-17 16:17:15.858824
2023-11-17 16:17:15
2023-11-17 16:17:15