New submission from INADA Naoki <songofaca...@gmail.com>: Since PEP 562 is implemented, we can use lazy imports easily.
Asyncio uses concurrent.futures.Future and concurrent.futures.ThreadPoolExecutor, but not concurrent.futures.ProcessPoolExecutor by default. Since importing concurrent.futures.process is slow, I want to import it lazily. And it make sense to import concurrent.futures.thread too, because it's very easy when we start to use __getattr__ once. Here is quick benchmark: $ ./python -m perf command ./python -c 'import asyncio' # patched ..................... command: Mean +- std dev: 60.5 ms +- 0.1 ms $ git stash $ ./python -m perf command ./python -c 'import asyncio' # original ..................... command: Mean +- std dev: 74.3 ms +- 0.2 ms ---------- components: Library (Lib) messages: 310272 nosy: inada.naoki, levkivskyi, yselivanov priority: normal severity: normal status: open title: Lazy import concurrent.futures.process and thread type: enhancement versions: Python 3.7 _______________________________________ Python tracker <rep...@bugs.python.org> <https://bugs.python.org/issue32596> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
