打开文件进行读取和写入？ [英] open file for both reading and writing?

问题描述

有没有办法来打开读取和写入文件？我以为R +是的。结果
因为我工作的二进制文件，我试过模式R + B，但我得到一个错误，该文件未打开阅读。

Is there a way to open a file for both reading and writing? I thought "r+" was for that.
Because I'm working on binary files I tried the mode "r+b", but I get an error that the file is not open for reading.

推荐答案

下面是你如何读取一个文件，然后写它（覆盖任何现有数据），无需关闭并重新打开：

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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