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python-time

  • 2026-01-29 18:10:23
python-time

三种时间表示

在Python中,通常有这几种方式来表示时间:

  • 时间戳(timestamp)
     :通常来说,时间戳表示的是从1970年1月1日00:00:00开始按秒计算的偏移量。我们运行“type(time.time())”,返回的是float类型。
  • 格式化的时间字符串。 
    如 2018-08-08 00:49:56
  • 元组(struct_time)
       : struct_time元组共有9个元素共九个元素:(年,月,日,时,分,秒,一年中第几周,一年中第几天,夏令时)

三者直接转换关系图

方法:

1.time.time()

返回当前时间的时间戳

2.localtime([secs])

将一个时间戳转换为当前时区的struct_time。secs参数为空,则以当前时间为准。

3.mktime()

将一个struct_time转换时间戳

4.asctime([t])

把一个表示时间的struct_time转为时间字符串这种形式:'Sun Jun 20 23:21:05 1993'

如果没有参数,将会将time.localtime()作为参数传入。

5.ctime([secs])

把一个时间戳(按秒计算的浮点数)转化时间字符串的形式。如果参数未给或者为 None的时候,

将会默认time.time()为参数。它的作用相当于time.asctime(time.localtime(secs))

6.strftime(format[,t])

把一个代表时间的struct_time转化为格式化的时间字符串

如果t未指定,将传入time.localtime()。如果元组中任何一个元素越界,ValueError的错误将会被抛出。

7.time.strptime(string[,format])

把一个格式化时间字符串转化struct_time。实际上它和strftime()是逆操作。

8.sleep(secs)

线程推迟指定的时间运行,单位为秒。

9.clock()

这个需要注意,在不同的系统上含义不同。在UNIX系统上,它返回的是“进程时间”,它是用秒表示的浮点数(时间戳)。 

而在WINDOWS中,第一次调用,返回的是进程运行的实际时间。而第二次之后的调用是自第一次调用以后到现在的运行 时间,即两次时间差。


格式化字符串符号


程序计时

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  139. /yingpanguazai/ssd/ssd1/www/f.mffb.com.cn/runtime/temp/067d451b9a0c665040f3f1bdd3293d68.php ( 11.98 KB )
  140. /yingpanguazai/ssd/ssd1/www/f.mffb.com.cn/vendor/topthink/think-trace/src/Html.php ( 4.42 KB )
  1. CONNECT:[ UseTime:0.000916s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001644s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000749s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000659s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001363s ]
  6. SELECT * FROM `set` [ RunTime:0.000581s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001487s ]
  8. SELECT * FROM `article` WHERE `id` = 469305 LIMIT 1 [ RunTime:0.002055s ]
  9. UPDATE `article` SET `lasttime` = 1770535028 WHERE `id` = 469305 [ RunTime:0.030457s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000700s ]
  11. SELECT * FROM `article` WHERE `id` < 469305 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001193s ]
  12. SELECT * FROM `article` WHERE `id` > 469305 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.004056s ]
  13. SELECT * FROM `article` WHERE `id` < 469305 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.002493s ]
  14. SELECT * FROM `article` WHERE `id` < 469305 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001827s ]
  15. SELECT * FROM `article` WHERE `id` < 469305 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.001724s ]
0.229356s