如何打开文件进行读写? [英] How to open a file for both reading and writing?

问题描述

是否可以打开文件进行读写?

Is there a way to open a file for both reading and writing?

作为一种解决方法，我打开文件进行写入，将其关闭，然后再次打开以进行读取.但是，有没有一种方法可以打开和读取 的文件?

As a workaround, I open the file for writing, close it, then open it again for reading. But is there a way to open a file for both reading and writing?

推荐答案

在这里，您无需关闭并重新打开即可读取文件，然后写入文件(覆盖现有数据):

Here's how you read a file, and then write to it (overwriting any existing data), without closing and reopening:

with open(filename, "r+") as f:
    data = f.read()
    f.seek(0)
    f.write(output)
    f.truncate()

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