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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: #recycleourewaste
@NEASingapore · Post #1170 · 18.11.2025 г., 03:22
Batteries are a big no-no in blue recycling bins as they could short-circuit and set fire to other materials. Drop them off in e-waste recycling bins instead. Learn more: go.gov.sg/e-waste#RecycleOurEWaste
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@NEASingapore · Post #1160 · 28.10.2025 г., 01:01
Give your e-waste a second life by recycling them at e-waste collection points! Here’s where you can recycle your e-waste: go.gov.sg/e-waste #RecycleOurEWaste#RecycleRight
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@NEASingapore · Post #1153 · 24.10.2025 г., 01:04
Still holding on to your spoilt electrical & electronic devices that are beyond repair? It’s time to let it go! Recycle them to recover precious materials (e.g. gold, silver, copper) that can be used to make new products. Learn more about how to recycle your e-waste at go.gov.sg/e-waste #RecycleOurEWaste#RecycleRight
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@NEASingapore · Post #1146 · 11.10.2025 г., 01:02
𝗟𝗲𝘁’𝘀 𝗸𝗲𝗲𝗽 𝗲-𝘄𝗮𝘀𝘁𝗲 𝗼𝘂𝘁 𝗼𝗳 𝗼𝘂𝗿 𝗹𝗮𝗻𝗱𝗳𝗶𝗹𝗹𝘀! Here’s how you can make a difference: 1. Fix your device instead of buying a new one 2. Opt for second-hand items 3. Donate working devices to someone who needs them 4. Recycle your e-waste: go.gov.sg/e-waste Join us at the International E-waste Day event to learn more! 🕰️12 Oct 2025 (Sun), 11.30am to 5pm 📍Bedok Town Square Every small action counts towards a greener future. 💚 #RecycleOurEWaste#RecycleRight
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@NEASingapore · Post #489 · 16.01.2023 г., 10:10
We all wish for abundance during Lunar New Year, so let’s preserve our planet’s precious resources by recycling e-waste properly. 🐰💚♻️ Find out where you can recycle your e-waste here: go.gov.sg/e-waste #RecycleOurEWaste#RecycleRight
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@NEASingapore · Post #205 · 04.06.2021 г., 02:13
E-waste recycling bins are available from today, at selected Dairy Farm Group & Harvey Norman outlets, ahead of NEA’s national e-waste management scheme on 1 Jul 2021. Drop off your e-waste and earn points that can be redeemed for shopping vouchers. Find out where the bins are at https://go.gov.sg/e-waste #RecycleOurEWaste#SayYEStoWasteLess
@NEASingapore · Post #300 · 04.01.2022 г., 09:30
#DidYouKnow e-waste can have many useful materials, including gold, silver, copper or plastic, that can be recovered and made into new products? Test your knowledge and share your views on e-waste recycling at go.gov.sg/ewaste-survey #RecycleOurEWaste#SayYEStoWasteLess
@NEASingapore · Post #672 · 14.10.2023 г., 01:00
Here’s a #FunFact on International E-waste Day: #DidYouKnow e-waste contains many useful materials, including gold, silver, copper or plastic, that may be recovered and made into new products? ♻️ Let’s #RecycleOurEWaste properly. Visit NEA’s (go.gov.sg/e-waste) and ALBA Singapore’s websites (www.alba-ewaste.sg) for the locations of the e-waste recycling bins and more information about the e-waste management system. #RecycleRight Let’s also reduce the amount of e-waste generated by: (a) considering if you really need to buy a new product, or if the current one can be repaired (b) choosing second-hand products over new products (c) donating devices that are in good condition to those who could put them to better use
@NEASingapore · Post #887 · 12.09.2024 г., 01:01
It’s time to bring on the Recycletimus Prime! Let's roll out and give our e-waste a second life by making sure to #RecycleRight: go.gov.sg/e-waste #TransformersOne#RecycleOurEWaste#SayYEStoWasteLess
@NEASingapore · Post #286 · 25.11.2021 г., 02:01
It’s sales galore, with #BlackFriday, #CyberMonday, and the 12.12 sales coming up in the next few weeks, but before tapping on the check out button, ask yourself: “Do I really need this?” For instance, if your current electronic device isn’t working, try sending it for repair, to save it from the landfill. And if it is beyond repair, don’t forget to drop it in a recycle bin. More at https://go.gov.sg/nea-recycle-e-waste #RecycleOurEWaste#SayYEStoWasteLess
@NEASingapore · Post #915 · 14.10.2024 г., 05:36
Give your e-waste a second life by recycling them this International E-waste Day 📱💻♻️ Find out more about how to recycle your e-waste at go.gov.sg/e-waste Let’s also reduce the amount of e-waste generated by: - Considering if you really need to buy new a product or if the current one can be repaired - Choosing second-hand products over new products - Donating devices that are in good condition to those who could put them to better use #RecycleRight#RecycleOurEWaste#IEWD2024#InternationalEWasteDay2024#DataSecurity