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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: #wetlands
@interesting_planet_facts · Post #546 · 12.08.2025 г., 13:22
🌎 In the wetlands of South America, the capybara reigns as the world’s largest rodent, reaching up to 66 kilograms. These social giants live in family groups, communicate with barks and whistles, and spend hours swimming—webbed feet make them graceful in water and capable of escaping predators with ease. ✨ #mammals⚡#wetlands⚡#adaptation 👉subscribe Interesting Planet
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@interesting_planet_facts · Post #963 · 25.10.2025 г., 12:11
🌎 The Okavango Delta in Botswana transforms each year from dry savanna to a maze of wetlands due to annual flooding, but modern irrigation and water extraction upstream have reduced natural flows. This human impact threatens a UNESCO World Heritage site that supports over 400 bird species and large populations of elephants and hippos. ✨ #conservation⚡#wetlands⚡#Africa 👉subscribe Interesting Planet 👉more Channels
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@amazingeo · Post #623 · 09.02.2026 г., 20:31
🌍 The Mississippi River Delta’s vast freshwater wetlands act as a natural filter, removing pollutants and buffering storm surges. These shifting marshes shelter over 400 species of fish and wildlife. ✨ #wetlands⚡#delta⚡#biodiversity⚡#geography⚡#nature⚡#earth 👉subscribe Amazing Geography 👉more Channels
@amazingeo · Post #585 · 21.01.2026 г., 20:31
🌍 The Okavango Delta in southern Africa floods seasonally with rainwater from distant highlands, creating vast, ever-shifting freshwater wetlands that support hundreds of rare animal species. ✨ #wetlands⚡#delta⚡#biodiversity⚡#geography⚡#nature⚡#earth 👉subscribe Amazing Geography 👉more Channels
@amazingeo · Post #544 · 29.12.2025 г., 20:31
🌍 The Danube Delta in Eastern Europe contains over 30 distinct types of freshwater wetlands, making it one of the most biodiverse delta systems in the world outside the tropics. ✨ #wetlands⚡#delta⚡#biodiversity⚡#geography⚡#nature⚡#earth 👉subscribe Amazing Geography 👉more Channels
@amazingeo · Post #510 · 12.12.2025 г., 20:31
🌍 Ethiopia’s Lake Tana is the source of the Blue Nile and is surrounded by freshwater wetlands that support dozens of bird species found nowhere else, making it a hotspot for endemic wildlife. ✨ #wetlands⚡#delta⚡#biodiversity⚡#geography⚡#nature⚡#earth 👉subscribe Amazing Geography 👉more Channels
@amazingeo · Post #323 · 02.10.2025 г., 15:31
🌍 River deltas like Vietnam’s Mekong and the Mississippi in the US form complex freshwater wetlands, creating twisting channels and islands that shelter rare fish, birds, and vital crops. ✨ #wetlands⚡#delta⚡#biodiversity⚡#geography⚡#nature⚡#earth 👉subscribe Amazing Geography 👉more Channels
@interesting_planet_facts · Post #930 · 18.10.2025 г., 18:11
🌎 The Florida Everglades, once a vast slow-moving river system, has been dramatically altered by canals, levees, and drainage for agriculture and cities. Over 50% of the original wetlands have been lost since the early 20th century, reducing habitat for species like the Florida panther and snail kite. ✨ #Everglades⚡#wetlands⚡#humanimpact 👉subscribe Interesting Planet 👉more Channels
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@amazingeo · Post #203 · 09.09.2025 г., 03:12
🌍 In Canada’s Hudson Bay lowlands, vast freshwater wetlands cover over 300,000 square kilometers. This area stores so much water it helps regulate the region’s climate and slow permafrost thaw. ✨ #wetlands⚡#freshwater⚡#climate⚡#geography⚡#nature⚡#earth 👉subscribe Amazing Geography🌍
@amazingeo · Post #243 · 15.09.2025 г., 20:12
🌍 Wetlands in the Siberian taiga freeze solid each winter, yet come alive in spring to host millions of migrating birds. These seasonal deltas become some of the world’s richest breeding grounds. ✨ #wetlands⚡#delta⚡#migration⚡#geography⚡#nature⚡#earth 👉subscribe Amazing Geography🌍
@amazingeo · Post #238 · 15.09.2025 г., 00:12
🌍 Salt marshes along coastlines act as natural buffers, soaking up floodwaters and trapping sediment. These unique habitats store carbon more efficiently than most forests. ✨ #coastline⚡#wetlands⚡#oceans⚡#geography⚡#nature⚡#earth 👉subscribe Amazing Geography🌍
@amazingeo · Post #618 · 07.02.2026 г., 12:31
🌍 In the last 30 years, parts of Louisiana’s coast have lost over 2,000 square kilometers of land to erosion and rising seas—an area bigger than many cities, disappearing into open water. ✨ #erosion⚡#sea-level ⚡#wetlands⚡#geography⚡#nature⚡#earth 👉subscribe Amazing Geography 👉more Channels