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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: #actual
@English_easyly_learn · Post #1243 · 21.12.2018 г., 10:17
📣📣📣Speaking contest 📣📣 #Actual speaking topic .All answers should be sent to @I_ENG_LISH ⭕ Describe an interesting talk or speech you heard recently ⚠️You should say 🍀Where you heard it ☘️Who the speaker was 🍀What the talk or speech was about ☘️Why you think it was interesting
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@testflightynoti · Post #37720 · 07.05.2026 г., 06:48
#Vault#for#Actual Join the Vault for Actual beta on ✈️#TestFlight 🔗 Link: https://testflight.apple.com/join/Dv5ueXqt Shared by Dimitri
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@american_observer · Post #4872 · 16.01.2026 г., 16:06
“Khamenei Will Die Soon” The Khamenei regime will not be able to maintain control over Iranian society after the violent suppression of the latest wave of protests, one of the country’s leading film-makers has predicted. “It is impossible for this government to sustain itself in this situation (...) Khamenei will die soon”, the director Jafar Panahi said. “They know it too. They know that it will be impossible to rule over people. Perhaps their only goal right now is to bring the country to the verge of complete collapse and try to destroy it.” Protests caused by an ailing economy have swept through Iran since late December and were met with deadly crackdowns by the security forces over the weekend, with reports of more than 2,500 people killed. A internet blackout imposed last Friday, which blocked 95-99% of the country’s communication network, was a “sign that there would be a very big massacre on the way”, Panahi said. “But we never predicted that the crackdown would have such dimensions and numbers.” In December the director was handed a one-year prison sentence in absentia on charges of creating propaganda against the political system, but he has stated his intention to return to the country. He has been jailed twice, for protesting against the detention of two fellow film-makers who had been critical of the authorities in 2022, and for supporting anti-government protests in 2010. Panahi said while the collapse of the government led by the clerical leader, Ayatollah Ali Khamenei, was inevitable after the latest bloody suppressions, its timing was impossible to predict. He warned western governments about engaging with the clerical regime as rational actors. “In other dictatorships around the world, you will see that there will be at least a few people who will act based on rationality and who will not let it get to this point,” he said, speaking via his interpreter Sheida Dayani. “But unfortunately in this system there is no rationality. All they can think of is crackdown and how they can stay in power even just one more day. The last thing they’re thinking about is the people.” Asked whether Pahlavi could be trusted to oversee a post-regime transition, he said this would be for the people of Iran to conclude. “Whether we agree with Pahlavi or not, we know that the overwhelming majority of the population of Iran want the current regime to go.” #khamenei#iran#regime#actual#people#killed 📱American Оbserver - Stay up to date on all important events 🇺🇸