@sickipedia · Post #9696 · 23.02.2025 г., 06:01
"Why are you so calm?". "I never argue with stupid people. I just say 'you're right' and move on. "That's ridiculous!". "You're right." #roast@Sickipedia
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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: #roast
@sickipedia · Post #9696 · 23.02.2025 г., 06:01
"Why are you so calm?". "I never argue with stupid people. I just say 'you're right' and move on. "That's ridiculous!". "You're right." #roast@Sickipedia
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@sickipedia · Post #9619 · 29.01.2025 г., 07:01
My buddy quit his job at BMW. He of course gave no indication that he was leaving. #roast@Sickipedia
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@sickipedia · Post #9601 · 23.01.2025 г., 07:01
My wife asked me, “Can we have some peace and quiet while I cook dinner?” So I took out the batteries from the smoke alarm. #roast@Sickipedia
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@sickipedia · Post #9558 · 08.01.2025 г., 11:01
I had a big fight with my wife, I yelled at her, "When you finally die, I'm getting you a headstone that says, 'Here Lies My Wife - Cold As Ever'." "Yeah well," she shouted back, "When you die, I'm getting you a headstone that says, 'Here Lies My Husband - Stiff At Last." #roast@Sickipedia
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@sickipedia · Post #9550 · 05.01.2025 г., 15:01
My coworker said: “ You should not eat red meat.” I said, “My grandmother lived to be 97.”… She said, “Did she eat red meat?” I said, “No. She minded her own business.” #roast@Sickipedia
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@sickipedia · Post #9512 · 24.12.2024 г., 07:01
I named my daughter after my mother-in-law. Raving Psycho will soon be a year old. #roast@Sickipedia
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@sickipedia · Post #9506 · 22.12.2024 г., 07:01
My son’s teacher thinks my son has a low IQ judging by his homework. That’s absurd! My son is perfectly normal! I did his homework. #roast@Sickipedia
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@sickipedia · Post #9485 · 15.12.2024 г., 06:01
My wife asked me, "is it just me or is the cat getting fat?" "no, it's just you." #roast@Sickipedia
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@sickipedia · Post #9162 · 28.08.2024 г., 11:01
I asked my mom If I was an accident. She said, "No, of course not. Your brother was the accident. You were a mistake". #roast @Sickipedia
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@sickipedia · Post #9055 · 24.07.2024 г., 11:01
Politicians and diapers have one thing in common: they should both be changed regularly… and for the same reason. #roast @Sickipedia
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@sickipedia · Post #9052 · 23.07.2024 г., 11:01
A man who owned a sausage factory was showing his arrogant asshole son around his factory. Try as he might to impress his snobbish son, his son would just sneer and look down his nose at everything. They approached the heart of the factory, where the father thought, "This should impress him!" He showed his son a machine and said, "Son, this is the heart of the factory. With this machine here we can put in a pig, and out come sausages." The son, unimpressed, said, "Yes, but do you have a machine where you can put in a sausage and out comes a pig?" The father, "Yes son, we call it your mother." #roast @Sickipedia
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@sickipedia · Post #8871 · 22.05.2024 г., 11:01
Wife: "How would you describe me?" Husband: "ABCDEFGHIJK." Wife: "What does that mean?" Husband: "Adorable, beautiful, cute, delightful, elegant, fashionable, gorgeous, and hot." Wife: "Aw, thank you, but what about IJK?" Husband: "I'm just kidding!" #roast @Sickipedia
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