如何使用python删除文件中的所有文本，而不删除/重新创建文件？

Question

I want to basically copy whats from the clipboard and paste it in a file in utf-8 encoding, but what ever I try, the file has the '?' symbols in it and is Anscii encoding...

But what I found out is, if there is a file that's already in utf-8 encoding, then whatever I paste in it manually (deleting whats there already), wont have the '?' in it.

So if there is a way to clear content in a utf-8 file, then copy whats from the clipboard and write it to that file then that would be great.

If I create the file, it's always ends up being Ancii...

Now I already know how to copy from clip board and write it to a file, its just how to clear a file which is confusing...

Answer 1

如果文件已经存在，则以写/读模式（ w+ ）打开文件将截断该文件而不进行重写。

Answer 2

The easiest solution I can think of (with my limited knowledge) is to make the file in Python in binary mode, since binaries support UTF-8 encoding:

fo=open("file.dat","wb")
# The 'b' flag tells python to make it binary

This should work with what you want to do.

To erase the file, just give an existing file name with 'w' and 'b' flags.