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Python零基础入门(七):文件操作

  • 2026-07-01 20:54:05
Python零基础入门(七):文件操作

Python零基础入门(七):文件操作

写了个脚本跑了3小时,结果忘了存。

下次开机,全没了。这种事干一次就够了。

一、读写三件套

写入用open()打开文件,指定'w'模式和编码,write()逐行写:

with open("output.txt", "w", encoding="utf-8") as f:    f.write("第一行\n")    f.write("第二行\n")

读取用'r'模式,read()一次性把内容拉进字符串:

with open("output.txt", "r", encoding="utf-8") as f:    content = f.read()    print(content)

大文件别用read(),直接迭代——不炸内存:

with open("data.txt", "r", encoding="utf-8") as f:    for line in f:        print(line.strip())

二、打开模式速查

模式
说明
文件已存在
文件不存在
'r'
只读
正常读取
报错
'w'
写入
清空后写入
新建
'a'
追加
末尾追加
新建

踩坑警告'w'会直接清空原文件!想保留旧数据,用'a'

三、with语句(必须用)

# 反面教材:忘了close就完蛋f = open("data.txt", "r")content = f.read()f.close()# 正确姿势:离开with块自动关闭,异常也不怕with open("data.txt", "r") as f:    content = f.read()

三个好处:自动关闭、异常安全、代码更短。

四、os模块:路径和目录

路径拼接——别手写斜杠,os.path.join()跨平台兼容:

import ospath = os.path.join("data", "files", "test.txt")

拆路径——取文件名、取目录、判断存在:

print(os.path.basename("/home/user/test.txt"))  # test.txtprint(os.path.dirname("/home/user/test.txt"))   # /home/userprint(os.path.exists("/tmp/test.txt"))           # True/False

目录操作——创建、列出、遍历:

os.makedirs("a/b/c", exist_ok=True)  # 创建多级目录files = os.listdir(".")              # 列出当前目录for root, dirs, files in os.walk("my_project"):    print(f"目录:{root},文件:{files}")

文件操作——重命名、复制、删除:

import shutilos.rename("old.txt", "new.txt")shutil.copy("source.txt", "dest.txt")os.remove("file.txt")

五、三个实用函数

统计文件行数、词数、字符数,像Linux的wc命令:

def count_file(filename):    with open(filename, "r", encoding="utf-8") as f:        lines = f.readlines()        return len(lines), sum(len(l.split()) for l in lines), sum(len(l) for l in lines)lines, words, chars = count_file("example.txt")print(f"行数:{lines},单词:{words},字符:{chars}")

安全写入——文件已存在就自动加后缀,避免覆盖:

def safe_write(filename, content):    import os    if not os.path.exists(filename):        with open(filename, "w", encoding="utf-8") as f:            f.write(content)        return filename    name, ext = os.path.splitext(filename)    counter = 1    while os.path.exists(f"{name}_{counter}{ext}"):        counter += 1    new_name = f"{name}_{counter}{ext}"    with open(new_name, "w", encoding="utf-8") as f:        f.write(content)    return new_name

读取配置文件——解析key=value格式,跳过注释和空行:

def read_config(filename):    config = {}    with open(filename, "r", encoding="utf-8") as f:        for line in f:            line = line.strip()            if not line or line.startswith("#"):                continue            if "=" in line:                key, value = line.split("=", 1)                config[key.strip()] = value.strip()    return config

下一篇预告:Pillow图片处理——Python也能批量处理图片。

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  1. CONNECT:[ UseTime:0.001077s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001586s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.003011s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.034761s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000895s ]
  6. SELECT * FROM `set` [ RunTime:0.005881s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000782s ]
  8. SELECT * FROM `article` WHERE `id` = 502382 LIMIT 1 [ RunTime:0.000517s ]
  9. UPDATE `article` SET `lasttime` = 1783006345 WHERE `id` = 502382 [ RunTime:0.007430s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.011613s ]
  11. SELECT * FROM `article` WHERE `id` < 502382 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.007882s ]
  12. SELECT * FROM `article` WHERE `id` > 502382 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.008959s ]
  13. SELECT * FROM `article` WHERE `id` < 502382 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.068523s ]
  14. SELECT * FROM `article` WHERE `id` < 502382 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.097976s ]
  15. SELECT * FROM `article` WHERE `id` < 502382 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.034183s ]
0.363220s