tail

[Antoon Pardon]

Op 23/04/2022 om 20:57 schreef Chris Angelico:
> On Sun, 24 Apr 2022 at 04:37, Marco Sulla<Marco.Sulla.Python at gmail.com>  wrote:
>> What about introducing a method for text streams that reads the lines
>> from the bottom? Java has also a ReversedLinesFileReader with Apache
>> Commons IO.
>
> 1) Read the entire file and decode bytes to text
> 2) Split into lines
> 3) Iterate backwards over the lines
>
> Tada! Done. And in Python, quite easy. The downside, of course, is
> that you have to store the entire file in memory.

Why not just do:

tail = collections.deque(text_stream, maxlen = nr_of_lines)
tail.reverse()
...

-- 
Antoon Pardon