使用 truncate 打开文件进行读写 [英] Open file for reading and writing with truncate

问题描述

如何打开一个也被截断为 0 的文件进行读写?

How do I open a file for reading and writing that is also truncated to 0?

我试过了:

f = open(PATH, 'w+')

但是，我无法读取文件(f.read() 返回一个空字符串).

I'm unable to read from the file (f.read() returns an empty string), however.

还有:

f = os.fdopen(os.open(PATH, os.O_RDWR | os.O_TRUNC), 'r+')

行为与之前的代码相同.

Same behavious as the previous code.

推荐答案

如果要存储数据然后截断使用 r+:

If you want to store the data then truncate use r+:

with open(PATH,"r+") as f:
    line = f.read()
    f.seek(0)
    f.truncate()

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