Python入门（三）：文件操作-优快云博客

本文链接：https://blog.youkuaiyun.com/zhuhaodonglei/article/details/79852081

本文详细介绍了如何使用Python进行文件的基本操作，包括读取、写入及替换等常见需求，并提供了具体的代码示例。

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【读取】：
1）
>>> filename = input('Enter file name: ')
Enter file name: test.txt
>>> fobj = open(filename, 'r')
>>> for eachLine in fobj:
... print (eachLine.strip())
...
AAA
BBB
>>> fobj.close()

2）
>>> file = open('test.txt', mode='r', encoding='utf-8')
>>> for eachLine in file:
... print (eachLine.strip())
...
AAA
BBB
>>> file.close()

3）
>>> f = open('test.txt', 'r')
>>> for el in f:
... b = el.strip()
... print (b)
...
AAA
BBB
CCC
>>> f.close()

4）指定读取（去除'A'）
>>> f = open('test.txt', 'r')
>>> for el in f:
... b = el.strip().strip('A')
... print (b)
...

BBB
CCC
>>> f.close()

【写入】：
1）覆盖写入
>>> f = open('test.txt', 'w+')
>>> f.write('AAA\n')
4
>>> f.close()

2）结尾写入
>>> f = open('test.txt','a+')
>>> f.write('BBB\n')
4
>>> f.close()

【替换】：
>>> f = open('test.txt','r',encoding='utf-8')
>>> f_new = open('test_bak.txt','w',encoding='utf-8')
>>> for line in f:
... if 'AAA' in line:
... line = line.replace('AAA','DDD')
... f_new.write(line)
...
4
4
4
>>> f.close()
>>> f_new.close()
>>> exit()