Најди сличен содржај

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

Hashtags

#define #tricks

Резултати

Пронајдени 2 слични објави

Пребарај: #wticrudeoil

当前筛选 #wticrudeoil清除筛选

Crypto M - Crypto News

@CryptoM · Post #65277 · 12.04.2026 г., 13:24

Најди слично Погледај

🚀 Polymarket Predicts WTI Crude Oil Price Surge by 2026 The probability of WTI crude oil reaching $110 by April 2026 has significantly increased on Polymarket, now standing at 67%, with a 13% rise in the last hour and a 20% increase over 24 hours. According to Odaily, the total trading volume for this event contract has surpassed $24 million. The contract stipulates that if the highest price of any one-minute candlestick for WTI crude oil futures during April 2026 equals or exceeds the listed price, the market will be deemed a 'yes'; otherwise, it will be a 'no'. Previously, the March WTI crude oil price prediction contract required the official settlement price of the active month contract on any trading day at the Chicago Mercantile Exchange to meet or exceed the listed price by the last trading day of March 2026 for a 'yes' outcome. U.S. President Donald Trump announced today that the U.S. Navy, the world's most powerful naval force, will begin blocking any vessels attempting to enter or exit the Strait of Hormuz. He also ordered the Navy to search and intercept any ships that have paid transit fees to Iran in international waters. Those who have paid such fees will not be allowed safe passage on the high seas, and efforts will begin to destroy Iranian mines in the strait. Trump warned that any Iranian who fires upon peaceful vessels will face severe consequences. He stated that Iran knows how to end the war that has devastated their country, noting the loss of their navy, air force, and defense systems, as well as the deaths of leaders including Khamenei, all due to their nuclear ambitions. The blockade is set to begin with other countries joining in, ensuring Iran does not profit from illegal extortion. Iran seeks money and, more importantly, nuclear weapons. #WTICrudeOil#OilPricePrediction#Polymarket#TradingVolume#April2026#USNavy#StraitOfHormuz#Iran#Trump#NuclearAmbitions#InternationalSecurity

Hashtags

#wticrudeoil #oilpriceprediction #polymarket #tradingvolume #april2026 #usnavy #straitofhormuz #iran #trump #nuclearambitions #internationalsecurity

Crypto M - Crypto News

@CryptoM · Post #64589 · 09.04.2026 г., 09:30

Најди слично Погледај

🚀 JPMorgan Chase Traders Outline Middle East Scenarios Impacting U.S. Stocks JPMorgan Chase traders have presented three potential scenarios in the Middle East that could significantly affect U.S. stock markets. According to NS3.AI, one scenario involves a bearish outlook where West Texas Intermediate (WTI) crude oil prices could surge to between $125 and $150. This could lead to increased market volatility and impact various sectors. Another scenario suggests that if tensions in the region de-escalate or there is a shift in government policy, an "everything rally" might occur. In this case, small-cap stocks and technology shares are expected to lead the market recovery. The third scenario involves a limited de-escalation, with traffic through the Strait of Hormuz remaining largely restricted. This situation is likely to bring only short-term stability to the markets, without significant long-term impact. #JPMorganChase#MiddleEastScenarios#USTocks#WTIcrudeoil#MarketVolatility#OilPrices#EverythingRally#SmallCapStocks#TechnologyStocks#StraitOfHormuz#MarketRecovery

Hashtags

#jpmorganchase #middleeastscenarios #ustocks #wticrudeoil #marketvolatility #oilprices #everythingrally #smallcapstocks #technologystocks #straitofhormuz #marketrecovery