New submission from Louie Lu: There is a XXX in v3.5.0 shows that need to dealing with deque maxlen setting case in deque_repeat.
Although there have common case for deque size 1 with maxlen, other size of deque with maxlen still using for-loop to extend the deque, without any detection. Adding this fast break will reduce the execution speed when repeat deque with maxlen. --- $ cat tests.py from collections import deque for _ in range(10: d = deque(maxlen=100_000) d.insert(0, 0) d.insert(0, 10) d * 10_000_000 $ time ./python_with_patch tests.py $ time ./python tests.py ---------- components: Extension Modules messages: 288460 nosy: louielu priority: normal severity: normal status: open title: Reduce deque repeat execution when maxlen exist and size is not 1 type: enhancement versions: Python 3.7 _______________________________________ Python tracker <rep...@bugs.python.org> <http://bugs.python.org/issue29634> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com