Remove very last character in file

Question

After looking all over the Internet, I\'ve come to this.

Let\'s say I have already made a text file that reads: Hello World

Well, I want to remo

Answer 1

with open('file.txt', 'w') as f:
    f.seek(0, 2)              # seek to end of file; f.seek(0, os.SEEK_END) is legal
    f.seek(f.tell() - 2, 0)  # seek to the second last char of file; f.seek(f.tell()-2, os.SEEK_SET) is legal
    f.truncate()

subject to what last character of the file is, could be newline (\n) or anything else.