TGINSIGHT SIMILAR POSTS
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: #yearofpublichygiene
@NEASingapore · Post #930 · 05.11.2024 г., 01:02
🎮 Singapore River Quest: Level Up IRL 🎮 Ready to game outside your room? 🧩 12 puzzles to crack 🏆 Prizes up for grabs 🏙️ Level up your knowledge of the SG River and its history Play solo or grab your squad and explore this outdoor game. More deets: go.gov.sg/singapore-river-quest #KeepSGClean#YearofPublicHygiene
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@NEASingapore · Post #862 · 20.07.2024 г., 01:01
🌴 It's always a treat to take a stroll around Marina Bay Sands in the evenings. If you are heading there to catch the fireworks during NDP previews, don’t forget to bin your litter properly while enjoying the view. Together, let’s #KeepSGClean! #YearOfPublicHygiene
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@NEASingapore · Post #805 · 01.04.2024 г., 03:55
Enforcements at the adjusted Orchard Road No Smoking Zone begins today, 1 Apr 2024. Watch this video go.gov.sg/orchard-road-no-smoking-zone-apr2024 or visit www.nea.gov.sg/ORNSZ to find out more. Together, let’s #KeepSGClean! #YearOfPublicHygiene
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@Govsg · Post #2342 · 26.07.2024 г., 07:09
Ever wondered what happens after a waste truck collects your waste? 🚮🚮🚮 With current disposal rate, Semakau Landfill is projected to reach full capacity by 2035. 🗑️🗑️🗑️ Let’s take action towards a more sustainable Singapore - say yes to reducing waste and do your part today! 👏🏻👏🏻👏🏻 #KeepSGClean#YearofPublicHygiene
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@NEASingapore · Post #784 · 04.03.2024 г., 12:43
#SGBudget2024 Opening of Singapore’s first Enviro Tech Innovation Hub in Apr 2024 – an industry-led collaboration to advance sustainable environmental cleaning and integrated facilities management; and support the cleaning workforce. More info at www.nea.gov.sg/year-of-public-hygiene#YearofPublicHygiene
@NEASingapore · Post #783 · 04.03.2024 г., 12:42
#SGBudget2024 To keep the incidence of vector-borne diseases low, we will focus on tackling rat issues at source and combating dengue by expanding Project Wolbachia - Singapore. More info at www.nea.gov.sg/year-of-public-hygiene#YearofPublicHygiene
@NEASingapore · Post #780 · 04.03.2024 г., 12:09
#SGBudget2024 The Ministry of Sustainability and the Environment has designated 2024 as the #YearofPublicHygiene to galvanise all to reinforce good hygiene practices for our collective well-being. In this year, we will: ✅ Continue to reinforce high standards of public hygiene ✅ Step up efforts across 5 key areas More information at www.nea.gov.sg/year-of-public-hygiene
@NEASingapore · Post #988 · 02.02.2025 г., 01:02
Happy World Wetlands Day! Wetlands are vital ecosystems that support a rich variety of wildlife! 🦀🦦🌱 As you wander through the wetlands of #StunningSingapore, such as the Sungei Buloh Wetland Reserve, be a gracious guest and bin your litter properly. Let’s do our part to #KeepSGClean and safeguard our wetlands for future generations. #YearofPublicHygiene
@NEASingapore · Post #956 · 23.11.2024 г., 01:03
👨👩👧👦 Holiday Fun Pick - Play:Date exhibition at National Museum of Singapore 🏛️ As we marvel at the exhibitions and architecture of our oldest museum, let's play our part in preserving its beauty by keeping it litter-free. #StunningSingapore#KeepSGClean#YearofPublicHygiene
@NEASingapore · Post #869 · 26.07.2024 г., 01:02
Planning to catch the fireworks in the Esplanade area tomorrow? While enjoying the stunning displays, let’s make sure to keep our #StunningSingapore shiny and sparkling by binning our litter properly. Together, let’s #KeepSGClean🌟#YearOfPublicHygiene
@NEASingapore · Post #853 · 06.07.2024 г., 03:22
🌴✨ Discover the serene beauty of Singapore Botanic Gardens. Admire the water lilies floating on a stunning lake amidst picturesque palm trees. Our #StunningSingapore spaces are truly breath-taking, and it's up to us to keep them that way! Let's ensure these public spaces stay litter-free and clean. #KeepSGClean#YearofPublicHygiene#StunningSingapore
@NEASingapore · Post #806 · 06.04.2024 г., 01:03
Step back in time with the heritage houses of Joo Chiat Road. These Peranakan beauties are a feast for the eyes and the soul. While exploring, let’s also take care of our #StunningSingapore spaces and #KeepSGClean. #YearofPublicHygiene