TGINSIGHT SIMILAR POSTS
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: #prepper
@Dulirenorg · Post #958 · 28.02.2023 г., 03:06
https://wangpei.net/2023/02/28/%E4%B8%AD%E7%BE%8E%E8%8B%A5%E5%BC%80%E6%88%98%EF%BC%8C%E4%B8%AD%E5%9B%BD%E5%9F%BA%E7%9D%A3%E5%BE%92%E8%83%BD%E5%81%9A%E7%82%B9%E4%BB%80%E4%B9%88%EF%BC%9F/ #prepper
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@Dulirenorg · Post #750 · 13.12.2020 г., 07:46
https://www.bbc.com/zhongwen/simp/world-55279719 #prepper
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@Dulirenorg · Post #629 · 28.02.2020 г., 00:10
https://youtu.be/UHPePkK6jno #prepper
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@Dulirenorg · Post #619 · 19.02.2020 г., 16:06
#prepper 来源： TheUrbanPrepper
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@Dulirenorg · Post #577 · 29.01.2020 г., 09:38
#灾变#prepper 感谢@Kakasiri 供稿！ https://lihkg.com/thread/1848464/page/1
@PracticalInformation · Post #1641 · 16.03.2025 г., 09:34
LDS PREPAREDNESS MANUAL From Chat It's from LDS, which is whatever, but its one of the most comprehensive pepper manuals I've ever seen #Prepping#Prepper
@Dulirenorg · Post #877 · 18.04.2022 г., 09:27
https://podcasts.apple.com/us/podcast/178-%E6%9C%AB%E6%97%A5%E6%96%B9%E6%A1%88%E4%B8%8E%E7%BE%8E%E5%BC%8F%E7%94%9F%E5%AD%98%E7%8B%82%E7%9A%84%E5%85%B4%E8%B5%B7/id1493503146?i=1000557087730 #避难#prepper
@Dulirenorg · Post #789 · 30.06.2021 г., 13:36
「逃荒」｜入门指南 视频来源 ©Lonewolf 902 https://youtu.be/FRSwm4Ebyw4 #隐世指南#prepper
@Dulirenorg · Post #699 · 23.04.2020 г., 06:44
A Guide To Food Storage©Utah State University FEMA, the Federal Emergency Management Agency, advocates disaster preparedness. They advise people to be informed, make a plan, and prepare an emergency kit. A major part of that emergency kit is food and water for you and your family. But, what types of food should you store? How much food should you store? How will you cook it? Does it need to be refrigerated? How much water needs to be stored and how? Will these foods go bad during storage? Can my family or I become sick if we store these foods incorrectly? Can I throw these foods in my car in case I am forced to evacuate my home? These are all questions that you need to consider in both your planning and preparation stages. #household#prepper#foods
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@Dulirenorg · Post #931 · 04.11.2022 г., 12:58
https://permacomputing.net/ 数字领域的朴门实践正在芬兰萌芽！ New to permacomputing? Permacomputing is a more sustainable approach to computer and network technology inspired by permaculture. Permacomputing is both a concept and a community of practice oriented around issues of resilience and regenerativity in digital technology. In a time where computing epitomizes industrial waste, permacomputing encourages a more sustainable approach, maximizing hardware lifespans, minimizing energy use and focussing on the use of already available computational resources. We do this because humans are part of nature and technology is an extension of humans, and we acknowledge that technology has been used to harm nature. We want to find out how we can practice good relations with the Earth by learning from ecological systems to leverage and re-center existing technologies and practices. We are also interested in investigating what a permacomputing way of life could be, and what sort of transformative computational culture and aesthetics it could bring forward. If you want to know more, please start reading about what is permacomputing in essence, and then dive into its principles. Wiki Started in May 2022, the permacomputing wiki is where we maintain a set of principles, collectively document practical perspectives and interpretations of these principles, and offer more speculative reflections on permacomputing. The wiki is still at a very early stage of development, we are frequently working on it. This main page of the wiki is an index to the various topics covered. See "about" for a more detailed discussion about the wiki itself. #致呼吸不畅的数字生活#DIY#prepper
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@Dulirenorg · Post #656 · 26.03.2020 г., 07:35
生存主义者里的中东经验与美国经验©忽左忽右 👉音频来源： https://open.spotify.com/episode/2Mx1ffZ6ArWR0pdx2HdLwm 👉波斯尼亚生存日记⇱ #灾变#共识社区#prepper
@Dulirenorg · Post #403 · 16.07.2019 г., 14:52
#灾变#prepper#household🏠 《东京防灾手册》
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