如何在python中查找并附加到二进制文件?

本文介绍了如何在python中查找并附加到二进制文件?的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述

我在将数据附加到二进制文件时遇到问题.当我seek()到某个位置，然后在该位置write()然后读取整个文件时，我发现数据未写入我想要的位置.相反，我在所有其他数据/文本之后立即找到它.

I am having problems appending data to a binary file. When i seek() to a location, then write() at that location and then read the whole file, i find that the data was not written at the location that i wanted. Instead, i find it right after every other data/text.

我的代码

file = open('myfile.dat', 'wb') file.write('This is a sample') file.close() file = open('myfile.dat', 'ab') file.seek(5) file.write(' text') file.close() file = open('myfile.dat', 'rb') print file.read() # -> This is a sample text

您可以看到seek不起作用.我该如何解决?还有其他方法可以实现这一目标吗?

You can see that the seek does not work. How do i resolve this? are there other ways of achieving this?

谢谢

推荐答案

在某些系统上，'ab'强制所有写入都在文件末尾进行.您可能需要'r+b'.

On some systems, 'ab' forces all writes to happen at the end of the file. You probably want 'r+b'.