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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

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DruschbaFM - English

@druschbaFm_en · Post #52668 · 29.03.2025 г., 08:06

⚡️ 🇷🇺 🇺🇦⚔️ Ukraine Fronts on the Morning of 29 March⚡️ 🔴#Sumy Direction: 🔴 At #Bryansk Border, mutual strikes. 🔴In #Sudzha Sector, to the west on Ukrainian soil, reportedly the RFAF is about to expand the zone of control on a broad front from #Vladimirovka up to #Basovka: 🟡#Vladimirovka- contested; 🟡#Vodolagi - AFU {2nd blue⬆️}; 🟡#Veselovka - taken by the RFAF {1st black⬆️}; 🟡#Belovody - AFU {3rd blue⬆️}; 🟡#Zhuravka - contested; 🟡#Basovka - contested. 🟡#Novenkoye, RFAF {1st red⬆️}. 🟡 In #Kursk region, reportedly, Russian forces advanced from the 'Border Checkpoint' {3rd red arrow} further south and have entered #Oleshnya 4th blue⬅️}. 🟡#Gogolevka, is reportedly RFAF controlled {2nd red⬇️}. 🟡 In #Guyevo, Russians filmed their presence in the village's north and fights further south {4th black⬅️}. 🎬 Video 1 🟡#Gornal remains under AFU control. 🔴In #KrasnayaYaruga Sector, militants enter #Popovka regularly up to its eastern part under RFAF fire {5th black↙️}. 🗺 Map 2 🟡 In #Demidovka, the AFU controls ca. 50% of the village. 🟡 At #Grafovka, lull. 🟡 At #Prilesye as well. 🗺 All on Map 1 🔴 In #Kharkov Direction, without changes. 🔴#Svatovo Front: 🔴 In #Kupyansk Sector, far north, Russian troops advanced in #Krasnoye1st. RF MoD claims its takeover. Further south, reportedly: 🟡#MalayaShapkovka has been entered; 🟡#Kondrashovka was taken and 🟡#Tischenkovka has been entered. 🔴 In #Borovaya, #Liman and #Seversk Sectors, and... 🔴#ChasovYar Direction, no major changes. 🔴#Pokrovsk Direction: 🔴 On the right Flank, far to the east, battles continue in the #Panteleymonovka area. To the west, for #Tarasovka. 🔴 South of the City, most of #Lysovka is RFAF controlled. 🔴 On the left Flank, the fighting (afore called clearing) continues in #Uspenovka. 🟡 In #Novoaleksandrovka, the battle for the village reportedly goes on. 🟡#Kotlyarovka has been approached by Russian troops. The AFU counterattack. 🟡 At #Bogdanovka, the RFAF advanced to the southern edge of the village. 🔴#Komar Direction: 🔴In #Bogatyr Sector (afore 'Konstantinopol Sector'), the RFAF advanced north of #Andreyevka in westerly direction and closed half of the pocket. Fighting continues to the west of the village (remember, previously the Russians were driven out of positions further west near #Alekseyevka). 🟡 In #Konstantinopol, Russian troops are still trying to regain control over the settlement. The AFU counterattack. 🟡 In #Razliv, the battle has reportedly shifted to the centre. 🟡On #Bogatyr, the RFAF are advancing on a broad front from the south. 🔴 In #Komar Sector, Russian troops move on #Otradnoye, located west of #Bogatyr. To the west, the battle for #Vesyoloye continue. 🔴#Zaporozhye Direction: 🔴In #Orekhov Section, positional fights in the are of​#MalayaTokmachka - #Rabotino area. Further west reportedly: 🟡 In #Shcherbaki, the battle continues with varying success. 🟡 In #MalyeShcherbakito the west, the RFAF try to get full control of the village. 🟡 In #Stepovoye, further west, the clashes continued. 🟡 In #Lobkovoye as well. 🟡#Pyatikhatki remains RFAF controlled. 🔴 In #Kherson Direction, the RFAF shelled AFU positions, the AFU, in turn, villages. 💥#Russia: 🔵 The AFU struck the 'Transmash Plant' in #Donetsk (#DPR); in #Lugansk (#LPR), the 'Industrial Zone'; in #Belgorod region, #Stroitel and several villages; and in #Kursk Region, again the 'Sudhza Gas Metering Station' and finished it off. 🎬 Video 2 💥#RestUkraine: 🔵 The RFAF, in turn, struck targets in the #Kiev, #Vinnitsa, #Zhitomir, #Kharkov, #Sumy, #Nikolayev, #Cherkassy, #Poltava, and #Chernigov regions, as well as in #Dnepropetrovsk. ⚠️ The Term 'Reportedly' indicates that it is unconfirmed! 🎞Vids Source 1; Source 2; 🗺 Maps @olegtsarov; @creamy_caprice 📋 Sources: CC; Tsarov; ⚡️2M; 🇺🇦Fiend;😼Kotenok 🕰As of 29 Mar 2025; 06:44 GMT+3;📃28 Mar 📱 Join GLOBAL DEPTH to boost your TG Feed 💬Join Military Chat for Comments & Discussions 🇺🇦On Ukraine Observer you will find your daily independent Ukraine War Battle Update