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Python学习笔记——从入门到报废(二十二、日期和时间)

  • 2026-04-28 19:55:37
Python学习笔记——从入门到报废(二十二、日期和时间)

在编写代码时,我们时常会碰到需要处理时间的情况,例如系统记录用户的操作、计算某段程序的处理时长、某个功能只在特定的时间段触发等。Python内置提供了如time、calendar、datetime等用于时间处理的模块,无需手动安装。本章我们就讲一讲常用的time和datetime模块。

一、time模块

绝大多数编程语言通常是以一个浮点数或整数来记录时间(单位是秒甚至纳秒),并不是一个我们直观看到的日期字符串,这个数字就是时间戳。每个时间戳都以自1970年1月1日午夜(历元)经过了多长时间来表示。例如:

import timeprint(time.time())# Output: 1753154674.3639271

时间戳单位最适于做日期运算。但是1970年之前的日期就无法以此表示;太遥远的日期也有此问题,UNIX和Windows只支持到2038年。

(1)时间元组

很多Python函数用一个元组装起来的9组数字处理时间,例如time模块将时间戳转换为struct_time元组:

print(time.localtime(time.time()))# Output: time.struct_time(tm_year=2025, tm_mon=7, tm_mday=22, tm_hour=11, tm_min=27, tm_sec=54, tm_wday=1, tm_yday=203, tm_isdst=0)

元组中的属性对应关系如下:

属性

字段

属性

字段

tm_year

年(四位数)

tm_sec

tm_mon

tm_wday

一周第几日

tm_day

tm_yday

一年第几日

tm_hour

小时

tm_isdst

是否夏令时

tm_min

分钟

(2)格式化时间

我们通常使用的时间表示是比较直观的,time模块也提供了将时间戳转换为更直观形式的格式化函数。例如:

print(time.asctime(time.localtime(time.time())))# Output: Tue Jul 22 11:33:58 2025

也可以根据自定义的格式将时间元组转换为格式化时间字符串:

print(time.strftime("%Y-%m-%d%H:%M:%S", time.localtime()))# Output: 2025-07-22 11:35:43

函数strftime第一个函数为格式化字符串,用于指定输出格式:%Y为四位数年份,%y为两位数年份,%m为月,%d为日,%H为24小时制小时,%I为12小时制小时,%M为分钟,%S为秒等。

同样,我们还可以将格式化的时间字符串解析为时间元组:

print(time.strptime("2025-07-22 11:35:43""%Y-%m-%d%H:%M:%S"))# Output: time.struct_time(tm_year=2025, tm_mon=7, tm_mday=22, tm_hour=11, tm_min=35, tm_sec=43, tm_wday=1, tm_yday=203, tm_isdst=-1)

time模块还提供了很多功能,例如函数time.sleep(secs)可以将程序挂起暂停执行若干秒,属性time.timezone可以表示当前时区与UTC(协调世界时)之间的偏移量(单位:秒)。

二、datetime模块

datetime模块是Python标准库中用于处理日期和时间的工具。它提供了相比time模块更多的类和方法。

(1)主要类

datetime模块包含以下主要类:

  • datetime.date:表示日期(年、月、日)。

  • datetime.time:表示时间(时、分、秒、微秒)。

  • datetime.datetime:表示日期和时间的组合。

  • datetime.timedelta:表示两个日期或时间之间的差异。

  • datetime.timezone:表示时区。

(2)创建日期和时间对象

from datetime import date, time, datetime# 创建日期对象today = date.today()               # 当前日期specific_date = date(2024101)  # 指定日期# 创建时间对象noon = time(1200)  # 指定时间# 创建日期时间对象now = datetime.now()                                 # 当前日期和时间specific_datetime = datetime(20241011200)  # 指定日期和时间print(f"Today's date: {today}")print(f"Specific date: {specific_date}")print(f"Noon time: {noon}")print(f"Current datetime: {now}")print(f"Specific datetime: {specific_datetime}")# Output:# Today's date: 2025-07-22# Specific date: 2024-10-01# Noon time: 12:00:00# Current datetime: 2025-07-22 15:05:11.023183# Specific datetime: 2024-10-01 12:00:00

(3)格式化及解析日期和时间

同time模块,datetime模块同样提供了strftime和strptime用于格式化或解析时间字符串:

date_str = "2024-10-01"datetime_str = "2024-10-01 12:00:00"# 解析字符串为日期和时间对象parsed_date = datetime.strptime(date_str, "%Y-%m-%d")parsed_datetime = datetime.strptime(datetime_str, "%Y-%m-%d%H:%M:%S")print(f"Parsed date: {parsed_date.date()}")print(f"Parsed datetime: {parsed_datetime}")# Output:# Parsed date: 2024-10-01# Parsed datetime: 2024-10-01 12:00:00

解析时的格式化字符串使用方法同time模块。

(4)时间差计算

相比time模块,datetime强大的其中一点在于其对时间差计算的良好支持,其timedelta类能够便捷地完成时间偏移量的加减运算:

from datetime import datetime, timedelta# 当前日期和时间now = datetime.now()# 计算未来日期future_date = now + timedelta(days=10)  # 10天后past_date = now - timedelta(days=5)  # 5天前print(f"Current datetime: {now}")print(f"Future datetime (10 days later): {future_date}")print(f"Past datetime (5 days ago): {past_date}")# Output:# Current datetime: 2025-07-22 15:10:10.071172# Future datetime (10 days later): 2025-08-01 15:10:10.071172# Past datetime (5 days ago): 2025-07-17 15:10:10.071172

也能方便地计算两个时间的差:

now = datetime.now()past = datetime(202561512130)print(f"Current time: {now}")print(f"Time delta: {now - past}")# Output:# Current time: 2025-07-22 15:13:39.936804# Time delta: 37 days, 3:12:09.936804

往期回顾:

零前端高颜值可视化图表交互,PyEcharts攻略|Part.1

Python可视化Seaborn全攻略 | Part.8

Python学习笔记——从入门到报废(二十一、文件(下))

Python可视化Seaborn全攻略 | Part.7

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  1. CONNECT:[ UseTime:0.000452s ] mysql:host=127.0.0.1;port=3306;dbname=no_67808;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000678s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000317s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000289s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000581s ]
  6. SELECT * FROM `set` [ RunTime:0.000217s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000658s ]
  8. SELECT * FROM `article` WHERE `id` = 484558 LIMIT 1 [ RunTime:0.006513s ]
  9. UPDATE `article` SET `lasttime` = 1777395671 WHERE `id` = 484558 [ RunTime:0.003159s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000696s ]
  11. SELECT * FROM `article` WHERE `id` < 484558 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.008266s ]
  12. SELECT * FROM `article` WHERE `id` > 484558 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.003453s ]
  13. SELECT * FROM `article` WHERE `id` < 484558 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000988s ]
  14. SELECT * FROM `article` WHERE `id` < 484558 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000823s ]
  15. SELECT * FROM `article` WHERE `id` < 484558 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.000785s ]
0.101596s