用python加入字节列表
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Joining byte list with python
提问by user2130898
I'm trying to develop a tool that read a binary file, makes some changes and save it. What I'm trying to do is make a list of each line in the file, work with several lines and then join the list again.
我正在尝试开发一个读取二进制文件的工具，进行一些更改并保存它。我想要做的是列出文件中的每一行，处理几行，然后再次加入列表。
This is what I tried:
这是我尝试过的：
file = open('myFile.exe', 'r+b')
aList = []
for line in f:
aList.append(line)
#Here im going to mutate some lines.
new_file = ''.join(aList)
and give me this error:
并给我这个错误：
TypeError: sequence item 0: expected str instance, bytes found
which makes sense because I'm working with bytes.
这是有道理的，因为我正在处理字节。
Is there a way I can use join function o something similar to join bytes? Thank you.
有没有办法可以使用连接函数 o 类似于连接字节的东西？谢谢你。
采纳答案by Andrew Clark
Perform the join on a byte string using b''.join():
使用b''.join()以下方法对字节字符串执行连接：
>>> b''.join([b'line 1\n', b'line 2\n'])
b'line 1\nline 2\n'
回答by mawimawi
Just work on your "lines" and write them out as soon as you are finished with them.
只需处理您的“线条”，并在完成后立即将它们写出来。
file = open('myFile.exe', 'r+b')
outfile = open('myOutfile.exe', 'wb')
for line in f:
#Here you are going to mutate the CURRENT line.
outfile.write(line)
file.close()
outfile.close()
