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Python零基础第25讲——文件读写

  • 2026-04-13 21:18:55
Python零基础第25讲——文件读写

导语:

学到现在,你可能会发现一个令人沮丧的现象:不管我们在程序里算了多少笔账、存了多少个字典,只要把黑框框(终端)一关,所有的数据就全都灰飞烟灭了。

想要让数据永久保存,我们就必须让 Python 学会跟电脑的硬盘打交道——也就是“文件读写”。今天,我们将掌握 Python 中最实用的一项技能,帮你真正推开自动化办公和数据处理的大门!


一、 把大象装进冰箱分几步?(基础打开与关闭)

在 Python 中操作文件,就跟把大象装进冰箱一样,永远分三步:打开文件 ➡️ 读/写数据 ➡️ 关闭文件

我们使用 open() 函数来召唤文件:

# 1. 打开文件("r" 代表 read,只读模式)f = open("example.txt""r")  # 2. 读取全部内容content = f.read()            print(content)# 3. 关闭文件(极其重要!)f.close()

⚠️ 避坑指南:

用完文件必须调用 .close() 关闭它!如果不关闭,文件会被程序一直霸占,不仅浪费内存,还可能导致数据丢失或别人无法修改。


二、 优雅永不过时:用 with 自动管理

每次都要记得写 close() 实在太反人类了,万一中间程序报错了,文件没来得及关怎么办?

Python 提供了一个极其优雅的“自动关门”语法——with 语句。这也是老司机们最推荐的写法!

# 使用 with,代码执行完毕后会自动帮你 close()with open("example.txt""r"as f:    content = f.read()    print(content)

划重点: 以后写文件操作,无脑用 with 就对了,安全又省心!


三、 怎么读?一口气吞下 vs 细嚼慢咽

当文件很小的时候,用 f.read() 一口气读完没问题。但如果这是一个几个 GB 的超大日志文件,一口气读完会让电脑内存瞬间爆炸。

这时候,我们需要逐行读取

with open("example.txt""r"as f:    for line in f:        # strip() 用来脱掉每行末尾自带的“换行符”外套        print(line.strip())

利用 for 循环,Python 会乖乖地一行一行读,读完一行扔一行,轻盈又高效!


四、 写入文件:是“洗牌重来”还是“锦上添花”?

搞定了读,咱们来看看怎么往文件里写内容。写文件有两种最常用的模式:

1. 霸道总裁模式("w" - Write):覆盖写入

只要用 w 模式打开,不管文件里以前有什么,全部清空,从头开始写。如果文件本来不存在,它会帮你新建一个。

with open("output.txt""w"as f:    f.write("这是第一行,以前的内容都被我抹掉了!\n")    f.write("这是第二行。\n")

2. 贴心暖男模式("a" - Append):追加写入

用 a 模式打开,以前的内容原封不动保留,新的内容会乖乖排在文件最末尾

with open("output.txt""a"as f:    f.write("我是新来的,我排在最后面追加一行。\n")

(注:字符串里的 \n 是换行符,告诉文件在这里要回车换行。)


五、 核心速记表:文件模式(Mode)说明书

为了方便大家查阅,这里整理了最常用的 4 种文件模式:

模式字符英文全拼作用说明文件不存在时
rRead只读。只能看,不能改。❌ 直接报错
wWrite写入。清空原内容,重新写。🆕 自动新建文件
aAppend追加。在原内容最后继续写。🆕 自动新建文件
r+Read+读写。既能读也能写。❌ 直接报错

六、 本讲总结

  • 操作流程:打开 (open) ➡️ 读写 (read/write) ➡️ 释放资源。

  • 最佳实践:抛弃手动的 close(),全面拥抱 with open(...) as f: 语法。

  • 读写策略:大文件记得用 for 循环逐行遍历;写文件时要分清是覆盖(w)还是追加(a)。

掌握了文件读写,你的 Python 程序终于拥有了“长期记忆”。接下来的项目里,我们就可以拿真实的本地数据来大显身手啦!

我为你整理了一套《Python零基础保姆级教程》,这不只是干巴巴的理论,而是包含:

✅ 完整版 Python 零基础到精通完整代码

✅ 完整注释讲解,一键运行

👇 获取方式:

想要解锁 [Python保姆级教程] 的同学,可以点击下方赞赏支持博主,并在后台留言

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  1. CONNECT:[ UseTime:0.000791s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000636s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000255s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000290s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000501s ]
  6. SELECT * FROM `set` [ RunTime:0.000203s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000549s ]
  8. SELECT * FROM `article` WHERE `id` = 486354 LIMIT 1 [ RunTime:0.000430s ]
  9. UPDATE `article` SET `lasttime` = 1776150368 WHERE `id` = 486354 [ RunTime:0.005655s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.002131s ]
  11. SELECT * FROM `article` WHERE `id` < 486354 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000528s ]
  12. SELECT * FROM `article` WHERE `id` > 486354 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000389s ]
  13. SELECT * FROM `article` WHERE `id` < 486354 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000877s ]
  14. SELECT * FROM `article` WHERE `id` < 486354 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001105s ]
  15. SELECT * FROM `article` WHERE `id` < 486354 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.014653s ]
0.156360s