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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: #defeatmeningitis
@ncdcgov · Post #4226 · 20.03.2024 г., 08:34
Meningitis can affect anyone at any age. Seek medical attention immediately if you experience symptoms. Symptoms include ➡️Fever/severe headache ➡️Vomiting ➡️Drowsiness ➡️Rash ➡️Seizures ➡️Muscle/joint pain ➡️Stiff neck #DefeatMeningitis
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@ncdcgov · Post #4114 · 05.12.2023 г., 11:43
#Meningitis can affect any age group but mostly occurs in children and young adults. Visit a healthcare centre for immediate medical attention if you notice any of these symptoms in your young ones. Let’s #DefeatMeningitis together.
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@ncdcgov · Post #4104 · 28.11.2023 г., 12:00
#Meningitis spreads mostly from one person to another through respiratory droplets e.g. coughing, sneezing & close contact such as kissing Seek immediate medical attention if you experience these symptoms Let’s #DefeatMeningitis together.
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@ncdcgov · Post #3717 · 06.02.2023 г., 08:29
#Meningitis spreads mostly from one person to another through respiratory droplets e.g. coughing, sneezing & close contact such as kissing Meningitis can affect anyone at any age. Seek medical attention if you experience symptoms. Let's take action to #DefeatMeningitis together.
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@ncdcgov · Post #3689 · 13.01.2023 г., 14:52
#Meningitis spreads mostly from one person to another through respiratory droplets e.g. coughing, sneezing & close contact such as kissing Meningitis can affect anyone at any age. Seek medical attention if you experience symptoms Let's take action to #DefeatMeningitis together
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@ncdcgov · Post #3684 · 11.01.2023 г., 12:01
#Meningitis is an inflammation of the membranes around the spinal cord & brain. Seek medical attention when you experience signs & symptoms such as: ➡️Fever/severe headache ➡️Vomiting ➡️Drowsiness ➡️Rash ➡️Seizures ➡️Muscle/joint pain ➡️Stiff neck #DefeatMeningitis
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@ncdcgov · Post #3683 · 10.01.2023 г., 14:45
#Meningitis is a medical emergency that can be deadly & can cause long-lasting impacts such as brain damage, hearing loss, organ damage & limb loss. Early recognition saves lives. Seek immediate medical attention if you experience associated symptoms. #DefeatMeningitis
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@ncdcgov · Post #4508 · 20.08.2025 г., 16:09
📌Meningitis is a vaccine-preventable disease but can progress rapidly and become life-threatening if not vaccinated early. The best way to protect yourself and your loved ones is: ✅Early vaccination ✅Recognizing the signs early ✅Seek immediate medical care ✅Follow prevention measures. Together, we can defeat meningitis💪 #DefeatMeningitis#StaySafe#NCDCNigeria
@ncdcgov · Post #4024 · 05.10.2023 г., 10:10
Across the world, meningitis kills 1 in 10 people & causes lifelong disability in 1 in 5 people who survive it. This #WorldMeningitisDay aims to remind us to raise awareness of #meningitis, its signs & symptoms, available vaccines and the race we must make to #DefeatMeningitis
@ncdcgov · Post #4336 · 22.07.2024 г., 09:39
Vaccination is the best prevention measure against #CerebrospinalMeningitis. Ensure you complete Nigeria's routine immunisation schedule for your children or wards to keep them safe and #healthy. #DefeatMeningitis
@ncdcgov · Post #4396 · 03.10.2024 г., 08:59
Vaccination is the best prevention measure against #CerebrospinalMeningitis. Ensure you complete Nigeria's routine immunisation schedule for your children or wards to keep them #safe from vaccine-preventable diseases. #DefeatMeningitis #WorldMeningitisDay