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Python拓展模块:文件文本读写模块

  • 2026-07-02 16:48:13
Python拓展模块:文件文本读写模块
 一、文件的打开 
  • 普通文件

数据持久化的最简单类型。仅仅是在一个文件名下的字节流,把数据从文件写入内存,从内存写入文件。

  • open()函数
f = open(filename,mode,buffering)

f:open()返回的文件对象

filename:文件的字符串名

mode:可选参数,打开模式和文件类型

buffering:可选,文件的缓冲区,默认值为-1

mode = 控制“怎么操作文件

模式
含义
'r'
读(默认)
'w'
写(覆盖)
'a'
追加
'r+'
读写
'b'
二进制
  • 文件的写操作+读操作

  • f.write() —— 写字符串

f = open("a.txt""w")f.write("hello")
#示例f.write("hello")f.write("world")#文件内容helloworld

想换行要自己写

f.write("hello\n")
  • f.writelines() —— 写列表
f.writelines(["a\n""b\n""c\n"])

👉一次写入多个字符串(列表)

  • f.read() —— 读全部内容

f = open("a.txt""r")content = f.read()print(content)

特点:返回类型:str;读取全部内容;文件大时可能占内存

  • f.readline() —— 读一行

f = open("a.txt""r")line = f.readline()print(line)

特点:返回字符串;每次一行;包含 \n

  • f.readlines() —— 读所有行(列表)

f = open("a.txt""r")lines = f.readlines()print(lines)

特点:返回list[str];每一行是一个元素;内存占用比 readline 高

 二、文件的关闭 
  • 文件打开后记得关闭
关闭的作用是终止对外部文件的连接,同时将缓存区的数据刷新到硬盘上。
  • 调用close()方法
f.close()
  • 使用上下文管理器(context manager)
确保在退出后自动关闭文件--with 语句通过上下文管理器机制,保证文件在使用结束后自动关闭,避免资源泄漏
with open("a.txt""r"as f:    content = f.read()    print(content)

 三、结构化文本文件:CSV 

CSV(Comma-Separated Values)

  • 纯文本文件以','为分隔符
#示例name,age,cityAlice,20,SeattleBob,25,NYC
值没有类型,所有值都是字符串;不能指定字体颜色等样式;不能指定单元格的宽高,不能合并单元格;没有多个工作表;不能嵌入图像图表。
  • 文件读取--reader()
import csvwith open("a.csv""r"as f:    reader = csv.reader(f)    for row in reader:        print(row)
#输出['name''age''city']['Alice''20''Seattle']['Bob''25''NYC']
  • DictReader —— 字典形式读取
与reader类似,但返回的每一个单元格都放在一个元组的值内。
import csvwith open("a.csv""r"as f:    reader = csv.DictReader(f)    for row in reader:        print(row)
#输出{'name''Alice''age''20''city''Seattle'}{'name''Bob''age''25''city''NYC'}
  • 文件写操作
import csvwith open("a.csv""w", newline=""as f:    writer = csv.writer(f)    writer.writerow(["name""age""city"])    writer.writerow(["Alice"20"Seattle"])
  • 字典数据写入
import csvwith open("a.csv""w", newline=""as f:    fieldnames = ["name""age""city"]    writer = csv.DictWriter(f, fieldnames=fieldnames)    writer.writeheader()    writer.writerow({"name""Alice""age"20"city""Seattle"})    writer.writerow({"name""Bob""age"25"city""NYC"})

 四、结构化文本文件:Excel 

  • openpyxl模块
用来读写扩展名为xlsx/xlsm/xltx/xltm的文件
workbook类是对工作部的抽象
worksheet类是对表格的抽象
cell类是对单元格的抽象文件写操作
  • 操作之前导入第三方库
#安装pip install openpyxl
#导入import openpyxl
  • 创建Excel文件
一个workbook对象代表一个Excel文档,使用该方法创建一个worksheet对象后才能打开一个表
import openpyxlwb = openpyxl.Workbook()ws = wb.activesheet.title = "学生信息"
  • 入单元格数据
#方法1:指定坐标sheet["A1"] = "姓名"sheet["B1"] = "年龄"sheet["A2"] = "Alice"sheet["B2"] = 20
#方法2:row/columnsheet.cell(row=3, column=1, value="Bob")sheet.cell(row=3, column=2, value=25)
  • 读取Excel文件
wb = openpyxl.load_workbook("students.xlsx")
  • 完整示例(创建 + 读取)

import openpyxl# 创建Excelwb = openpyxl.Workbook()sheet = wb.activesheet["A1"] = "姓名"sheet["B1"] = "年龄"sheet["A2"] = "Alice"sheet["B2"] = 20wb.save("students.xlsx")# 读取Excelwb2 = openpyxl.load_workbook("students.xlsx")sheet2 = wb2.activeprint(sheet2["A2"].value)print(sheet2["B2"].value)
  • 获取单元格信息
#获取单元格内容print(sheet["A1"].value)#使用 row / column 获取print(sheet.cell(row=2, column=1).value)

cell.coordinate:返回单元格左标

cell.value:返回单元格的值

cell.row:返回单元格所在的行坐标

cell.column:返回单元格列坐标

五、结构化文本文件:PDF 

  • 读取PDF文件
#1️⃣打开 PDFfrom pypdf import PdfReaderreader = PdfReader("a.pdf")#2️⃣获取页数print(len(reader.pages))#3️⃣读取某一页page = reader.pages[0]#4️⃣提取文本text = page.extract_text()print(text)
  • PDF的写操作
#1️⃣创建写对象from pypdf import PdfWriterwriter = PdfWriter()#2️⃣添加页面writer.add_page(page)#3️⃣保存文件with open("new.pdf""wb"as f:    writer.write(f)
  • 合并多个文档
from pypdf import PdfReader, PdfWriterwriter = PdfWriter()for file in ["a.pdf""b.pdf"]:    reader = PdfReader(file)    for page in reader.pages:        writer.add_page(page)withopen("merged.pdf""wb"as f:    writer.write(f)
  • 单个页面操作--PageObject类
#1️⃣获取页面page = reader.pages[0]#2️⃣读取文本print(page.extract_text())#3️⃣旋转页面page.rotate(90)#4️⃣添加到 writerwriter.add_page(page)

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  1. CONNECT:[ UseTime:0.000591s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000861s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000342s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000301s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000622s ]
  6. SELECT * FROM `set` [ RunTime:0.000249s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000706s ]
  8. SELECT * FROM `article` WHERE `id` = 494467 LIMIT 1 [ RunTime:0.000640s ]
  9. UPDATE `article` SET `lasttime` = 1783063318 WHERE `id` = 494467 [ RunTime:0.013187s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000324s ]
  11. SELECT * FROM `article` WHERE `id` < 494467 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001313s ]
  12. SELECT * FROM `article` WHERE `id` > 494467 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000805s ]
  13. SELECT * FROM `article` WHERE `id` < 494467 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001137s ]
  14. SELECT * FROM `article` WHERE `id` < 494467 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001178s ]
  15. SELECT * FROM `article` WHERE `id` < 494467 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.007891s ]
0.105287s