60 – File tail

60 – File tail#

You can get the last few lines of a file with collections.deque. You just have to set maxlen to the number of lines you want from the end of the file:

from collections import deque

with open("/path/to/python/lib/this.py", "r") as f:
    tail = deque(f, maxlen=4)

for line in tail:
    print(line)

#     for i in range(26):
#         d[chr(i+c)] = chr((i+13) % 26 + c)
# 
# print("".join([d.get(c, c) for c in s]))

If the file has fewer lines than the ones you asked for, you get the full file.