file operate in python (open write read close )

最新推荐文章于 2024-04-26 15:36:57 发布

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本文介绍Python中文件操作的基础知识，包括如何使用`open()`函数打开文件、`read()`, `readline()`, `readlines()`用于读取文件内容、`write()`和`writelines()`用于写入文件、以及`close()`确保文件正确关闭。

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1. file open:
fd = open(N1,N2) :N1:path of the file to be open like '/home/warrior/Downloads/test.txt'
N2:some choiceable parameter
                                      'r':read only   'w':write only   'r+':read and write 'a':write and will add content at the end of file
2. file read:
content = fd.read():read all content of the file
oneline = fd.readline():read one line content of the file
lastContent = fd.readlines():read the content from current vernier to the end of the file
3. file write:
fd.write(content):when opening in 'w' it will write content cover the original content
                              when opening in 'a' it will write content add at the end of the file but not start one new line again
fd.writelines(content): when opening in 'w' it will write content cover the original content
                                      when opening in 'a' it will write content add at the end of the file and start one new line again
4. file close:
fd.close():when open one file must close it as you will not use it .
5. file others:
fd.seek(number):set the vernier of the file

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