删除 python 中文件末尾的换行符

Question

I'm modifying a file with python that may already contain newlines like the following:

#comment
something

#new comment
something else

My code appends some lines to this file, I'm also writing the code that will remove what I added (ideally also working if other modifications occurred in the file).

Currently, I end up with a file that grows each time I apply the code (append/remove) with newlines characters at the end of the file.

I'm looking for a clean way to remove those newlines without too much programmatic complexity. Newlines "inside" the file should remain, newlines at the end of the file should be removed.

Answer 1

use str.rstrip() method:

my_file =  open("text.txt", "r+")
content = my_file.read()
content = content.rstrip('\n')
my_file.seek(0)

my_file.write(content)
my_file.truncate()
my_file.close()