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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

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Пронајдени 5 слични објави

Пребарај: #greencity

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EKOLOG.UZ| ENG

@ekologuzenglish · Post #10664 · 06.12.2025 г., 13:05

🌳 Trees in Navoi Are in Danger! On Tarobi Street and in other parts of the city, trees are being improperly pruned. Side branches are being cut “haphazardly,” leaving trees looking like palms instead of maintaining their natural shape. According to research conducted by ecologists, 90% of the cut branches were alive, directly harming the trees and the city’s ecology. Under the legislation of the Republic of Uzbekistan, particularly the Law “On Environmental Protection” and regulations on the protection of green spaces in urban areas, any work on trees must consider their health and natural form. Although the city administration notes that no special permits are required to trim side branches, this does not exempt anyone from responsibility for damaging trees or violating protection norms. Ecologists call on authorities and citizens to pay attention to this issue and, if necessary, amend legislation to protect the trees and the city’s green areas. 🌱 Trees are the lungs of our city — we must take care of them! #Navoi#TreePruning#Ecology#GreenCity#LegalBasis☘️Read the latest environmental news on the @ekologuz page. Follow us and send your suggestions and wishes via @eklguz_bot Instagram | Facebook | Twitter | Sayt | Youtube.

EKOLOG.UZ| ENG

@ekologuzenglish · Post #11161 · 12.01.2026 г., 05:03

🌳 Alarm from Residents of Olmazor Business City: Trees at Risk of Destruction! Residents of Olmazor Business City are raising the alarm: in the Olmazor district of Tashkent, along the Kichik Chalk Canal (5A Kichik Xalka Yo‘li Street), the construction of a multi-story building is ongoing. On the construction site, long-standing trees used to grow, but now they have become victims of the developers’ destructive methods — their roots are exposed, and any delay could lead to the trees drying out and being cut down. People are asking: why destroy nature for yet another building? Trees are not only a source of the city’s beauty but also provide clean air, shade, and life for residents. Project investor: Turkish company Ozun Insaat Yatirim Danismanlik Construction managed by: LLC Ozun Tashkent Construction Developer/sales: Bizning Uylar Development Residents are fighting for every tree, but it seems their voices remain unheard by the developers. They call for the help of the public and authorities: protecting nature is essential! Every tree in this area represents the history, life, and breath of the city. Saving the remaining trees is not a whim — it is the responsibility of everyone who cares about Tashkent’s future. 📢 We urge everyone to pay attention to this environmental challenge and support residents in the fight to protect the green space! #SaveTheTrees#OlmazorBusinessCity#EcoTashkent#GreenCity#ProtectNature ☘️Read the latest environmental news on the @ekologuz page. Follow us and send your suggestions and wishes via @eklguz_bot Instagram | Facebook | Twitter | Sayt | Youtube.