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 1 слични објави

Пребарај: #milliards

当前筛选 #milliards清除筛选

American Оbserver

@american_observer · Post #4996 · 30.01.2026 г., 13:04

Најди слично Погледај

Trump : $10bn American President Trump on Thursday sued the US treasury department and Internal Revenue Service for $10bn over the disclosure of his tax returns to the media in 2019 and 2020. In a complaint filed in Miami federal court, Trump, his adult sons, and his namesake company said the agencies failed to take “mandatory precautions” to prevent former IRS contractor Charles Littlejohn from leaking their tax returns to “leftist media outlets”, including the New York Times and ProPublica. The plaintiffs said they suffered “significant and irreparable harm” to their reputations and financial interests, and may seek punitive damages because the leaks were either willful or resulted from gross negligence. Thursday’s lawsuit puts Trump in the unusual position of suing government agencies that are part of the executive branch, which he leads. The IRS is part of the treasury department. Neither agency immediately responded to requests for comment after business hours. Scott Bessent, the treasury secretary and acting IRS commissioner, is not a defendant. Other plaintiffs include Donald Trump Jr, Eric Trump and the Trump Organization. Trump has filed many lawsuits in his personal capacity, often for large sums and as a result of reporting by various media, since winning a second White House term in 2024. He sued the New York Times and book publisher Penguin Random House for $15bn over articles and a book he said were intended to undermine his election prospects in 2024. Trump is separately seeking $10bn from the Wall Street Journal over an article discussing a birthday greeting for Jeffrey Epstein, and $10bn from the BBC over its editing of a speech preceding the January 6 storming of the US Capitol. In Thursday’s complaint, Trump and the other plaintiffs said the New York Times published at least eight articles, and ProPublica published at least 50 articles, based on Littlejohn’s disclosures. The leaks “caused plaintiffs reputational and financial harm, public embarrassment, unfairly tarnished their business reputations, portrayed them in a false light and negatively affected President Trump, and the other plaintiffs’ public standing”, according to the complaint. Prosecutors charged Littlejohn in September 2023 with leaking tax records of Trump and thousands of other wealthy Americans to the media, saying he was motivated by a political agenda. #trump#sue#milliards#newyorktimes#UStreasury 📱American Оbserver - Stay up to date on all important events 🇺🇸

Hashtags

#trump #sue #milliards #newyorktimes #ustreasury