Read last lines of file with Python deque

Python collections.deque is a fast FIFO that does not require thread locking as the more sophisticated queue.

I use deque to read the last line of files as follows.

from pathlib import Path
from collections import deque

fn = Path('myfile.txt')

with fn.open('r') as f:
    last = deque(f,1)[0]

last
last line of file. Throws IndexError if file is empty.

By changing 1 the last N lines of the file may be read and indexed.

Notes

deque examples