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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 #52845 · 04.04.2025 г., 08:04

⚡️ 🇷🇺 🇺🇦⚔️ Ukraine Fronts on the Morning of 4 April⚡️ 🔴#Sumy Direction: 🔴In #Sudzha Sector, to the west in Ukrainian lands, the RFAF is reportedly fighting off counterattacks and the battle for #Zhuravka continues. 🟡 In #Basovka's eastern part, Russian mobile groups on quads continue to advance. 🗺 Map 2 🟡 In #Kursk region, the fighting at AFU controlled #Oleshnya continues. According to video evidence, Russian troops have advanced to the centre of #Guyevo. 🔴In #KrasnayaYaruga Sector, the villages of #Popovka and #Demidovka are still embattled. Reportedly the RFAF extended the zone of control. 🗺 All on Map 1 🔴#Kharkov Direction: 🔴In #Liptsy and #Volchansk Sections, mutual shelling. 🔴#Svatovo Front: 🔴 In #Kupyansk Sector, there are battles for #Kamenka, otherwise no major changes. 🔴 In #Borovaya Sector, as well. 🔴In #Liman Sector, the RFAF continue infantry attacks west of #BalkaZhuravka with the aim of stretching the AFU and a subsequent assault on #Katerinovka and #Novoye. 🔴In #Seversk Sector, there are positional battles near #Belogorovka and at #Verkhnekamenskoye fighting continues. 🔴#ChasovYar Direction: 🔴In #ChasovYar Sector, fighting continues without major changes. 🔴In #Toretsk Sector, as well. 🔴#Pokrovsk Direction: 🔴 On the right Flank, far to the east, there are no major changes. Russian troops attack #Valentinovka, and further west the battle for #Tarasovka continues. 🔴 South of the City, heavy clashes with varying success and no significant changes on the frontline for now. 🔴 On the left Flank, Russian units reportedly advanced in the area of #Kotlyarovka - #Bogdanovka and finally entered the outskirts of #Kotlyarovka and #Troitskoye. 🔴#Komar Direction: 🔴In #Bogatyr Sector, Russian troops advanced over a section up to 3 km wide in the area of #Andreyevka. 🟡 Towards #Alekseyevka, the AFU advanced with an armoured column and came under AFU fire. The result of the action is disputed. 🎬 Video 🟡 In #Konstantinopol, the RFAF is trying to get a foothold again. 🗺 All on Map 3 🟡 Towards #Bogatyr, Russian troops reportedly advanced 1 km deep and 1.5 km along the front. 🔴 In #Komar Sector, the Russian takeover of #Vesyoloye has been confirmed by an Ukrainian soldier (according to video evidence, the RFAF have advanced to the southeastern edge), Russian troops reportedly have entered the southern outskirts of #Fyodorovka. 🔴#Zaporozhye Direction: 🔴In the #Orekhov Section, the villages of #Shcherbaki and #MalyeShcherbaki remained embattled. The RFAF reportedly, after taking #Lobkovoye (still unconfirmed), continued to advance in the area of #Stepovoye and #Lobkovoye in northerly and northwestern direction toward #Zaporozhye. 💥 In the #DPR, the AFU wounded two civilians in #Gorlovka by a drone drop. 💥 In #Kherson Direction, mutual shelling. Several villages came under AFU fire, wounding 2 civilians. 💥#OldRussia: 🔵In #Bryansk Region, the border settlement of #BelayaBerezka was hit by AFU drones, wounding 2 civilians. In #Kursk region, Russian air defence downed 17 UAVs. In #Belgorod region, several villages came under AFU fire. Air defence shot down a drone flying toward #Moscow. Over #Rostov and Lipetsk regions, UAVs were destroyed. RF MoD claimed that energy infrastructure in #Kursk, #Belgorod and #Zaporozhye regions as well as in #LPR were subjected to strikes. 💥#RestUkraine: 🔵 The RFAF struck #Kharkov and the surrounding area by 'Geranium' UAVs. Explosions were reported in #Kiev region and #Dnepropetrovsk. ⚠️ The Term 'Reportedly' indicates that it is unconfirmed! 🎞 Video Source 🗺 Maps @olegtsarov; @petrenko_iHS 📋 Sources: CC; Tsarov; 🇺🇦Fiend;⚡️2M;🐈Cat😼VK 🕰As of 4 Apr 2025; 06:33 GMT+3;📃3 Apr 📱 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