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: #animalfacts
@googlefactss · Post #40352 · 18.12.2025 г., 07:01
The average lifespan of a goldfish (Carassius auratus) is 10-15 years, with some varieties living into their thirties when properly cared for. However, one male goldfish named Tish (1956-1999) lived to the remarkable age of 43, making him the world’s oldest goldfish ever. [Read more] @googlefactss #FunFact#AnimalFacts#fish
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@googlefactss · Post #40273 · 07.12.2025 г., 19:03
Male llamas grow sharp canines called ‘fighting teeth’ that they use to show who's boss and settle disputes with other males. @googlefactss#Llamas#AnimalFacts#Nature🦙🦷
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@googlefactss · Post #40353 · 18.12.2025 г., 11:02
Pets can be allergic to humans. [Read more] @googlefactss #health#pets#AnimalFacts
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@googlefactss · Post #40094 · 15.11.2025 г., 11:03
Cats have three types of color-detecting cones, just like humans, but see colors less vividly. They perceive blues and greens well, but reds and pinks may appear grayish. Their vision excels at detecting subtle movement, especially in dim light. 🔵🟢🌙 [Read more] [See here] @googlefactss#CatVision#AnimalFacts#Science
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@googlefactss · Post #40438 · 30.12.2025 г., 07:02
Beavers build dams to protect themselves from predators like bears and wolves. They live in lodges, not in the dam itself, on deep ponds made by the dams. These lodges have underwater entrances, so beavers can safely enter and leave without being seen. The pond keeps land animals away and the lodge is a dry home and food storage. 🦫🌊🌿@googlefactss#Beavers#Wildlife#Nature#AnimalFacts
@googlefactss · Post #40414 · 26.12.2025 г., 11:00
Llamas spit to protect themselves, keep their place, or show power. Males spit in fights over females. Females spit to stop males. They also spit when annoyed or mistreated. Llama spit has saliva and partly digested food. It can fly up to 10 meters (33 feet). 🦙💨 [Source] @googlefactss#Llamas#AnimalFacts#Spitting
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@googlefactss · Post #40974 · 25.04.2026 г., 14:01
Penguins have several group names. A group in water is called a “raft.” On land, it is called a “waddle.” A large group of penguins living or breeding together is called a “colony.” The place where they gather to breed is also called a “rookery.” 🐧🌊🏝️🐣 [Read more] @googlefactss #Penguins#AnimalFacts#Wildlife#DidYouKnow
@googlefactss · Post #40697 · 24.02.2026 г., 09:20
Elephants can “listen” with their feet. Their foot pads have special nerve receptors that detect ground vibrations, including very low-frequency infrasound. Vibrations from other elephants’ rumbles or footsteps travel through the ground. Signals move through their bodies to the brain. Vibrations can also reach the inner ear through bone conduction. This helps elephants communicate over long distances and sense distant movement. 🐘🌍👣🔊 [Read more] @googlefactss #Elephants#AnimalFacts#Wildlife#Nature#Science#DidYouKnow
@googlefactss · Post #40591 · 26.01.2026 г., 11:02
Hippos secrete red oily "blood sweat" that protects their skin from sun and germs. It keeps their skin moist and healthy. 🦛☀️ [Read more] @googlefactss #Hippos#AnimalFacts#Nature#Wildlife#SunProtection
@googlefactss · Post #40226 · 30.11.2025 г., 15:02
🐾 Capybaras are the world's largest rodents — social, semi-aquatic animals that live in groups in South America. They're so calm that other animals often sit on them, and they can even sleep underwater! 🌊 [Learn more] @googlefactss#Capybara#AnimalFacts#Nature#Rodents#Wildlife
@googlefactss · Post #40188 · 25.11.2025 г., 11:04
Whale sharks have tiny teeth covering their eyeballs. 🦈👁️ These "dermal denticles" act like protective armor for their protruding, lidless eyes. [Source] @googlefactss#AnimalFacts#Sharks#MarineBiology#NatureIsWild
@googlefactss · Post #40808 · 16.03.2026 г., 15:00
Snow leopards are sometimes seen biting or holding their own tails. Scientists think they may do this to stay warm in cold mountain habitats or to play. A snow leopard’s long, thick tail also helps it balance on steep rocky cliffs and can wrap around its body like a blanket. 🐆❄️🐾 [Read more 1] [Read more 2] @googlefactss #snowleopard#animalfacts#wildlife#naturefacts#bigcats#didyouknow