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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: #oceans
@interesting_planet_facts · Post #1028 · 13.11.2025 г., 12:11
🌎 Symbiosis between clownfish and sea anemones is a classic example of cooperation in nature. Clownfish live among anemone tentacles for protection, while their movements help ventilate and clean the anemone. Clownfish secrete mucus that prevents the anemone’s stings from harming them. ✨ #biology⚡#oceans⚡#animals 👉subscribe Interesting Planet 👉more Channels
@interesting_planet_facts · Post #932 · 18.10.2025 г., 22:11
🌎 Ocean-based carbon removal technologies are being piloted to fight climate change. Examples include spreading crushed minerals in seawater or using seaweed farms to absorb CO2. One experiment off Canada’s coast aims to capture and store up to 20,000 tons of CO2 per year. ✨ #climate⚡#oceans⚡#technology 👉subscribe Interesting Planet 👉more Channels
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@interesting_planet_facts · Post #752 · 15.09.2025 г., 00:22
🌎 Box jellyfish, found in tropical oceans, have venom so deadly it can stop a human heart within minutes. Their nearly invisible tentacles can reach up to 3 meters long and are packed with thousands of stinging cells. ✨ #animals⚡#venom⚡#oceans 👉subscribe Interesting Planet
@amazingeo · Post #608 · 02.02.2026 г., 12:31
🌍 Asia is the largest continent, but the Pacific Ocean is even bigger—its area almost doubles that of all land in Asia, making it Earth’s vastest single geographic feature. ✨ #continents⚡#oceans⚡#earth⚡#geography⚡#nature 👉subscribe Amazing Geography 👉more Channels
@amazingeo · Post #387 · 18.10.2025 г., 15:31
🌍 The Pacific Ocean is wider than the entire Moon. At its widest, it stretches over 19,000 kilometers from Asia to the Americas—more than the Moon’s diameter of 3,474 kilometers. ✨ #continents⚡#oceans⚡#geography⚡#nature⚡#earth 👉subscribe Amazing Geography 👉more Channels
@amazingeo · Post #261 · 18.09.2025 г., 20:12
🌍 Earth’s surface area is about 510 million square kilometers—more than 70% is covered by oceans, making our home a true water planet among the rocky worlds of our Solar System. ✨ #Earth⚡#oceans⚡#planet⚡#geography⚡#nature⚡#earth 👉subscribe Amazing Geography🌍
@amazingeo · Post #155 · 01.09.2025 г., 09:12
🌍 The Southern Ocean, officially recognized in 2021, surrounds Antarctica and connects the Atlantic, Pacific, and Indian Oceans, forming a unique ring of cold currents that help regulate Earth’s climate. ✨ #continents⚡#oceans⚡#climate⚡#geography⚡#nature⚡#earth 👉subscribe Amazing Geography🌍
@amazingeo · Post #345 · 07.10.2025 г., 20:31
🌍 Earth’s mountain-building processes are still active—over 80% of volcanoes erupt near tectonic plate boundaries, constantly creating new land and even islands in the world’s oceans. ✨ #geology⚡#volcanoes⚡#oceans⚡#geography⚡#nature⚡#earth 👉subscribe Amazing Geography 👉more Channels
@amazingeo · Post #692 · 16.04.2026 г., 20:31
🌍 The Atlantic Ocean is growing wider each year as the Americas slowly drift apart from Europe and Africa, adding about 2.5 centimeters annually—roughly the speed fingernails grow. ✨ #continents⚡#oceans⚡#tectonics⚡#geography⚡#nature⚡#earth 👉subscribe Amazing Geography 👉more Channels
@amazingeo · Post #348 · 08.10.2025 г., 18:31
🌍 The Eurasian and North American continents are moving apart by about 2.5 centimeters every year along the Mid-Atlantic Ridge, slowly widening the Atlantic Ocean over millions of years. ✨ #continents⚡#oceans⚡#tectonics⚡#geography⚡#nature⚡#earth 👉subscribe Amazing Geography 👉more Channels
@amazingeo · Post #462 · 18.11.2025 г., 20:31
🌍 Antarctica is the only continent entirely surrounded by ocean and is nearly twice the size of Australia. Its thick ice reflects sunlight, helping regulate Earth’s overall temperature. ✨ #continents⚡#oceans⚡#Antarctica⚡#geography⚡#nature⚡#earth 👉subscribe Amazing Geography 👉more Channels
@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🌍