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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 24 слични објави

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Airdrop Comic

@airdropcomic · Post #2424 · 22.04.2026 г., 14:20

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@giiveaways · Post #3016 · 04.09.2024 г., 16:30

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@giiveaways · Post #3136 · 18.09.2024 г., 17:17

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@giiveaways · Post #2918 · 27.08.2024 г., 16:18

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Crypto Fight || News 🚀

@cryptofightnews · Post #2712 · 18.05.2025 г., 16:03

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SLEX NEWS

@slex_io · Post #133 · 05.12.2023 г., 14:17

🚀 Bitcoin Surpasses $40k and it's only beginning! 📈 🌪️The crypto world is buzzing with excitement as Bitcoin breaks through the $40k barrier, signaling a potential bull run soon. It's a time of exhilarating market movements and boundless opportunities! 🎉 During this market explosion, we have some thrilling news about the SLEX Coin listing. This is a moment you won't want to miss! 💰As the market heats up, there's no better place for trading than SLEX Exchange. Let’s ride the wave of this bullish trend together and make the most of what's coming! #BullRun#SLEXCoinListing#CryptoNews#SLEXExchange Telegram | Reddit | Facebook | Instagram | Medium | Linkedin | Twitter

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