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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: #meningitis
@ncdcgov · Post #4327 · 10.07.2024 г., 14:37
Bacterial meningitis leaves 1 in 5 people with disabilities such as hearing loss, brain damage and limb loss. But meningitis is largely vaccine-preventable! Parents/caregivers are urged to visit any primary health care centre to get their children/wards vaccinated against #meningitis.
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@ncdcgov · Post #4285 · 22.05.2024 г., 12:01
Your input is crucial in shaping better prevention, treatment and control strategies against #Meningitis in Nigeria. 📋Take our #Meningitis KAP Survey to share your knowledge, attitudes, and practices. 🔗Survey link https://forms.gle/R5uxSdet2nPNQvpRA
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@ncdcgov · Post #4217 · 13.03.2024 г., 08:53
#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.
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@ncdcgov · Post #4215 · 11.03.2024 г., 07:27
#Meningitis is a serious infection that can lead to severe complications & death Report immediately to a healthcare facility if you or a loved one experiences ➡️Neck pain ➡️Pain on looking at bright lights ➡️Vomiting ➡️Muscle/joint/limb pain ➡️Rash ➡️Seizures ➡️Cold hands & feet
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@ncdcgov · Post #4211 · 08.03.2024 г., 12:33
#Meningitis vaccines are safe, effective, and give protection to your family and community. Parents and caregivers, now is the time to catch up on the childhood immunisations that protect against meningitis.
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@ncdcgov · Post #4202 · 01.03.2024 г., 09:19
Any form of #Meningitis is an emergency! ALL healthcare workers are urged to have a high index of suspicion and immediately report if they notice these signs & symptoms in their patients: ➡️Fever/severe headache ➡️Vomiting ➡️Drowsiness ➡️Rash ➡️Seizures ➡️Muscle/joint pain ➡️Stiff neck
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@ncdcgov · Post #4181 · 02.02.2024 г., 08:48
The spread of #meningitis is usually through: ➡️ Direct person-to-person contact, including droplets from the nose and throat of infected persons. ➡️Close and prolonged contact with an infected individual. Visit the nearest health facility immediately if you notice any of the CSM-associated signs and symptoms.
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@ncdcgov · Post #4176 · 30.01.2024 г., 09:56
#Meningitis is an inflammation of a thin layer of the connective tissue that covers the brain and the spinal cord. This inflammation can be caused by infection with bacteria, viruses, parasites, fungi, injuries and certain drugs. Know the symptoms to seek early health care. Advisory: https://ncdc.gov.ng/news/508/cerebrospinal-meningitis-public-health-advisory
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@ncdcgov · Post #4170 · 24.01.2024 г., 08:24
#Meningitis is an epidemic-prone disease requiring immediate reporting in Nigeria. ALL healthcare workers are urged to have a high index of suspicion if they notice these signs & symptoms in their patients: ➡️Fever/severe headache ➡️Vomiting ➡️Drowsiness ➡️Rash ➡️Seizures ➡️Muscle/joint pain ➡️Stiff neck
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@ncdcgov · Post #4159 · 12.01.2024 г., 08:29
Bacterial meningitis is largely vaccine-preventable; #meningitis vaccines are safe, effective, and give protection to your family and community. Parents and caregivers, now is the time to catch up on the childhood immunisations that protect against meningitis.
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@ncdcgov · Post #4036 · 13.10.2023 г., 10:24
Hand washing is one of the most effective ways of preventing the spread of infectious diseases including #meningitis Always wash your hands with soap under running water for protection against meningitis and other deadly diseases Also ensure you and your loved ones are vaccinated with the recommended immunisations
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@ncdcgov · Post #4021 · 03.10.2023 г., 14:29
Report immediately to a healthcare facility if you or a loved one experiences the below symptoms of #Meningitis ➡️Neck pain ➡️Pain on looking at bright lights ➡️Vomiting ➡️Muscle/joint/limb pain ➡️Rash ➡️Seizures ➡️Cold hands & feet Early recognition saves lives
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