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Изворен канал @pythonotes · Post #32 · 7 фев.
Скорее всего уже слышали, что складывать строки через + это плохая практика. Падение производительности, и всё такое. Без лишних слов, давайте измерять: from timeit import timeit def t1(): # складываем 10 строк через + из переменной t = 'text' for _ in range(1000): s = t + t + t + t + t + t + t + t + t def t2(): # склеиваем список строк через метод join arr = ['text'] * 10 for _ in range(1000): s = ''.join(arr) def t3(): # складываем через + но не из переменной а непосредственно инлайн объекты for _ in range(1000): s = 'text' + 'text' + 'text' + ... # всего 10 раз Теперь каждую строку склейки запустим по 10М раз >>> timeit(t1, number=10000) 0.21951690399964718 >>> timeit(t2, number=10000) 1.4978306379998685 >>> timeit(t3, number=10000) 0.2213820789993406 Хм, а нам говорили что через "+" это плохо и медленно ))) 😁 Тут стоит учитывать, что речь идёт о склейке множества длинных строк. Давайте изменим условия: def t4(): t = 'text'*100 for _ in range(1000): s = t + t + t + t + t + t + t + t + t def t5(): arr = ['text'*100] * 10 for _ in range(1000): s = ''.join(arr) def t6(): for _ in range(1000): s = 'text'*100 + 'text'*100 + ... # всего 10 раз >>> timeit(t4, number=10000) 12.795130728000004 >>> timeit(t5, number=10000) 2.642637542999182 >>> timeit(t6, number=10000) 0.2184546610005782 Вот, уже другой разговор, сразу видна разница, в среднем в 6 раз. Но погодите, почему последний тест t6() по скорости такой же как и t3()? Ведь строки теперь в 100 раз длиннее! Это вопросы оптимизации кода, какие простые изменения ускоряют или замедляют выполнение программы. Мы столкнулись с примером обхода обращения к переменной. Например, именно так работает директива #define в С++, во время компиляции подставляя значение переменной вместо ссылки на неё. В Python это тоже работает, но часто ли вы сможете встретить такой способ работы со строками? К сожалению, способ почти только теоретический. В целом, тесты показали то, что мы хотели. Делаем выводы самостоятельно. Полный листинг 🌍 #tricks
Пребарај: #scenepalace
@PrivateTrackerNews · Post #795 · 12.08.2019 г., 10:29
#ScenePalace Our server bill is due in 3 days so right now and up until the time runs out, if you donate any amount I will give you 4 weeks freeleech and you will receive 30 gigs upload!!! The Donate Button is on the main page above Shout. Remember to pm me and let me know, thanks. 我们的服务器账单将在3天后到期，直到时间用完为止，如果你捐出任何金额，我会给你4周freeleech，你将收到30上演！ 捐款按钮位于Shout上方的主页面上。 记得向我发消息让我知道，谢谢。
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@PrivateTrackerNews · Post #676 · 05.07.2019 г., 16:18
2019/07/06 #开放注册 #OpenSignupTracker #国外PT 整理自电报 @PT资讯频道 Telegram @privatetrackernews 著名零日综合站 限1万名，有谷歌验证，注册使用邀请码 SUMMER2019 进站送15GB上传，可保种100个种子(种子体积10 MB以上才计算)慢慢攒魔力换上传或者辅种或者上盒子。 始于2006年，会员30万+，种子90万+，其中活跃种子30万+，全站黑种无免费，下载6GB后，总分享率要求为0.4，低于0.4将被警告，有6天时间提升回0.4。单种分享率大于0.4或者做种60小时(可间隔累积)以上免HR警告，连续HR警告可能被禁号。 关于零日(0day)：0day就是比官方更早发布的影视资源版本。比如一部蓝光电影，官方正式发布日期是7月9号，但某网站7月8 日就已经发布了这电影的蓝光版本，那这个资源就是0day资源。为什么官方还没发布，而某网站却有这个资源，这里不作探讨。 Tracker's Name: #TorrentLeech Genre: General Sign-up Link: http://www.torrentleech.org/user/account/signup Closing date: HURRY UP! For the first 10k people only! Additional information: TorrentLeech (TL) is a Private Torrent Tracker for 0-Day / General Releases. Note: Use invite code SUMMER2019 in the sign up form 电影电视综合 ScenePalace是Twilights，TwilightZoom，p2pelite和TheHorrorCharnel的姐妹网站。 Tracker's Name: #ScenePalace Genre: General Sign-up Link: https://scenepalace.info/signup.php Closing date: Soon! Additional information: ScenePalace is a Private Torrent Tracker for Movies / TV / General Releases. As mentioned ScenePalace is a sister site of Twilights, TwilightZoom, p2pelite and TheHorrorCharnel. 越南无损音乐 Tracker's Name: #HQMusic Genre: Music Sign-up Link: http://hqmusic.info/register.php Closing date: Soon! Additional information: HQMusic is a Vietnamese Private Torrent Tracker for Lossless Music Releases. #开放申请注册 #OpenApplicationSignupTracker 德国零日综合 Tracker's Name: #TheShinning (Open for Application Signup) Genre: General Sign-up Link: https://theshinning.me/application Closing date: Soon! Additional information: The Shinning (TsH) is a German Private Torrent Tracker for 0-Day / General Releases.
@PrivateTrackerNews · Post #862 · 30.08.2019 г., 12:26
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