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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 #52098 · 15.03.2025 г., 07:56

⚡️🇷🇺🇺🇦⚡️ Two Majors #Summary for the Morning of 15 March 2025; 06:29 (GMT+3)⚡️ 🛡More than 20 UAVs were downed by air defence and EW means over the #Voronezh region at night. The governor of the #Bryansk region also reported that an UAV attack had been repelled. Local media reported explosions (15-20) over #Volgograd, with one drone downed near 'Sarepta Station.' The likely target was the local oil refinery, with footage of a fire emerging. During the day, a drone crashed in the centre of #Dzhankoy (#Crimea), injuring 2 women. The UAV damaged a café, and shrapnel struck 2 private houses and a church. There were 3 wounded. 🎯 Russian Forces, in turn, targeted industrial zones and the port in #Odessa and its surroundings with Geranium drones. A fire broke out at an electrical substation following one of the strikes, and the regional administration reported that #Chernomorsk (#Ilyichevsk) was completely blacked out due to damage to the energy infrastructure. The enemy also reported strikes on #Chernigov, #Pavlograd, #Cherkassy, #Starokonstantinov, the Bogodukhovsky district of the #Kharkov region, as well as the #Vinnitsa and #Kiev regions. 🔹 In #Kursk Region, the destruction of remaining enemy forces attempting to retreat into the #Sumy region continues. Trump has stated that thousands of AFU militants are encircled. The final settlements left to be liberated are #Gogolevka, #Gornal, #Oleshnya, and #Guyevo. The enemy is striking liberated territories. AFU Nazis targeted the local history museum in #Sudzha, an architectural monument from the late 19th century. A museum employee, who had remained in the city during the occupation and had come to inspect the building, was killed. 2 other employees were wounded. Since 12 March, 209 residents have been evacuated from the liberated settlements. Amid the Russian Army’s advance and the Supreme Command’s objective of creating a buffer zone, mandatory evacuation has begun in 8 villages near the border in the #Yunakovka and #Miropolye communities of the #Sumy region. Russian forces have already pushed into enemy territory towards #Basovka and #Zhuravka. Until demining operations are completed, the authorities in the region have imposed temporary entry restrictions in 122 settlements across 6 districts bordering #Ukraine. 🔹 In the North of #Kupyansk Direction, reports indicate clashes with AFU forces near #Figolevka on the right bank of the Oskol. 🔹 In #Pokrovsk Direction, fighting continues near #Udachnoye, #Kotlino, #Peschanoye, #Shevchenko, and #Tarasovka. The enemy claims that Russian units, freed up after the liberation of #Konstantinovka, have been redeployed to #Pokrovsk to increase pressure. 🔹 On the #Vremyevka Ledge, the 'Group of Troops East' continues advancing towards #Bogatyr west of the village. Fighting is ongoing in the areas of #Dneproenergiya and #Burlatskoye. 🔹 On the #Zaporozhye Front, reports indicate Russian success near #Shcherbaki and #MalyeShcherbaki.🗺👆Russian units continue to assault enemy positions in the forest plantations. From the southern side, airborne troops have entered #Shcherbaki, assaulting enemy fortifications and strongpoints. The enemy has pulled back its main forces, leaving observation posts in the village manned with machine gun and rifle crews, supported by artillery and kamikaze drones. #Shcherbaki is nearly cleared. Assault groups of the Russian Airborne Forces are advancing from the south towards #MalyeShcherbaki and from the east towards #Shcherbaki. 💥 In #Belgorod Region, the enemy continues heavy strikes. #Valuyki, #Kukuyevka, #Murom, #Shebekino, #Tishanka in the Volokonovsky district, and #YasnyeZori in the Belgorod district are under attack. 💥 In #Gorlovka (#DPR), a Nazi drone strike injured a 1951-born woman and a 1981-born man. A 1970-born man was injured by enemy barrel artillery. 📱 Join GLOBAL DEPTH to boost your TG Feed 💬Welcome to Military Chat & Ukraine Observer 🇺🇦On Ukraine Observer you will find your daily independent Ukraine War Battle Update