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@LanguageStuff · Post #8712 · 04.07.2024 г., 13:29
English language #learnenglish https://t.me/LanguageStuff
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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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Andijan Development Center
@adceducate · Post #8013 · 23.10.2023 г., 13:40
« ADC » THE WAY TO KNOWLEDGE 🧠🫨 #knowledge#adceducate#english#school#brain #learnenglish
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BBC Learning English
@english_bbc_learning · Post #3698 · 28.09.2025 г., 09:41
🙄 Do you ever want to tell someone that you just don’t care? 🤷♂️🤷♀️ This expression is for you! 🐵⚠️Use it carefully though – it’s VERY informal! Write your answer in the comments and don’t forget to give this post a like! Do you have a similar expression in your language? #learnenglish
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ENGLISH TIPS & QUIZZES™️
@englishtipsquizzes · Post #131 · 18.02.2023 г., 10:23
🔰🔰🔰 Questions without inversion In informal conversation a question can sometimes have the same word order as in a statement. The question has a rising intonation • The machine gives change? ~ No, it doesn't. • You're travelling tomorrow?~ Yes. • The car is blue?~ That's right. • The car is what colour? ~ Blue. • They went which way?~ That way. We use this kind of question only when it follows on from what was said before. I need a return ticket to Paddington • You're travelling when?~ Tomorrow. #learnenglish#vocabulary 👉@wallstreetenglish_WSE
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ENGLISH TIPS & QUIZZES™️
@englishtipsquizzes · Post #70 · 09.02.2023 г., 11:30
#vocabulary#learnenglish
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ENGLISH TIPS & QUIZZES™️
@englishtipsquizzes · Post #67 · 09.02.2023 г., 07:45
🔰When Someone Is Insistent/Pressuring You🔰 • I’d love to, but I really can’t/have to go/don’t have the time. • It’s been a pleasure, but I really have to go. • This simply isn’t the right time, unfortunately. • I would love to help you, but I’m already overcommitted as it is. • I wish I could be of more help to you, but I can’t. • I must respectfully decline. • I’m sorry, but I can’t help you. • I don’t have time for this at the moment. • Please leave me alone/stop pushing. • This conversation is unnecessary. • Maybe this is the way you get things done, but I don’t like it. • It’s useless; you’re wasting your efforts on me. • You’ll be wasting your time if you keep talking to me/pushing me. • Why don’t you take this up with someone who actually has the time? • You really should put your energy elsewhere. • If I need your help, I’ll ask for it. • The answer is no. • No is a complete sentence. • You’re pushing too hard—stop it! • Go bother somebody else! #learnenglish#vocabulary @wallstreetenglish_WSE @wallstreetenglish_WSE @wallstreetenglish_WSE
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ENGLISH TIPS & QUIZZES™️
@englishtipsquizzes · Post #58 · 07.02.2023 г., 13:22
**🔰Air Lane VS Airline🔰** • Air lane (Also: airway ) a regular route of travel for aircraft: - This will enable controllers to squeeze an extra 20 percent traffic into the crowded air lanes. • Airline 1. Company that carries passengers and cargo by airplane: - The airline has announced it will run daily service to Florida. 2. A tube through which air is passed under pressure: - Any big truck lives and dies, steers and brakes, on its air-lines. #learnenglish#vocabulary @wallstreetenglish_WSE @wallstreetenglish_WSE @wallstreetenglish_WSE
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ENGLISH TIPS & QUIZZES™️
@englishtipsquizzes · Post #51 · 06.02.2023 г., 09:15
🔰Adapted For Something VS Adapted To Something🔰 Adapted For Something —(of things) made suitable for a new use, situation, etc.: • The book was adapted for television as a four-part series screened by the BBC. Adapted To Something —(of people) accustomed or suitable to smth.: • I am not adapted to this business. • I was bred a farmer, and ought not to have left that occupation. #learnenglish#vocabulary
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ENGLISH TIPS & QUIZZES™️
@englishtipsquizzes · Post #40 · 05.02.2023 г., 15:09
#learnenglish#grammar Don't forget to follow us 👇👇👇 @wallstreetenglish_WSE
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English Language
@Englishdaybyday · Post #6254 · 22.07.2025 г., 20:21
✈️ Conversations on the plane 🤣#english#learnenglish ▬▬▬▬▬▬▬▬▬▬▬▬ ➠@PhrasalCards ➠@SlangWords ➠@IdiomsLand ➠@Vocabulix ➠@GrammarCards ➠@EnglishGate ➠@StoryPage
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Espresso English
@EspressoEnglish · Post #3922 · 17.08.2025 г., 19:16
😂At the dentist with Mike🩷 Comment Preply and I'll send you the link! ✨#english#learnenglish ▬▬▬▬▬▬▬▬▬▬▬▬ ➠@PhrasalCards ➠@SlangWords ➠@IdiomsLand ➠@Vocabulix ➠@GrammarCards ➠@EnglishGate ➠@StoryPage
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Espresso English
@EspressoEnglish · Post #3867 · 07.07.2025 г., 19:56
😂At the dentist with Mike🩷 Comment Preply and I'll send you the link! ✨#english#learnenglish ▬▬▬▬▬▬▬▬▬▬▬▬ ➠@PhrasalCards ➠@SlangWords ➠@IdiomsLand ➠@Vocabulix ➠@GrammarCards ➠@EnglishGate ➠@StoryPage
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