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
#photo#SouthSudan
The world’s newest country, South Sudan, marked a decade of independence this month, but it’s still one of the world’s poorest nations, scarred by war and hunger.
South Sudan gained independence in 2011, but an intertribal conflict broke out two years later that escalated into a full-blown civil war which has crippled the country’s economy and agriculture.
This Red Cross station in Kobok was the only place where people in South Sudan’s Upper Nile region could get medical help, make phone calls, or simply get something to eat. The Red Cross staff treated all patients equally, regardless of whether they were soldiers or civilians.
Unfortunately, the hospital was destroyed by government forces three weeks after our crew filmed it.
Follow: https://t.me/rtdocumentary
🇨🇳#China - 🇸🇸#SouthSudan: Chinese troops from the 12th Chinese Peacekeeping Infantry Battalion under UNMISS (UN mission in South Sudan) conducted live-fire training in South Sudan last week.
UNMISS has been in the country since 2011 to protect civilians and support stability. The Chinese contingent previously drew major attention after the July 2016 Juba violence, when internal UN findings said Chinese and Ethiopian peacekeepers did not leave their bases to assist civilians despite orders to intervene.
An aid workers’ compound only a few hundred meters from a UN base received no help despite repeated distress calls and a survivor personally reaching the base and pleading for help. Multiple civilians, as well as a journalist, were killed during the clashes at that time.
🇷🇺🇸🇸 The Ambassador of Russia to South Sudan, A.Kosmodemiyanskiy, met with the Minister of Presidential Affairs of South Sudan, Africano Mande Gedima.
🔸 During the friendly and constructive discussion, current issues of bilateral relations were addressed.
🔸A.Kosmodemiyanskiy handed over to the Minister a copy of the personal invitationfrom the President of the Russian Federation, Vladimir Putin, to the President of South Sudan, Salva Kiir Mayardit, to attend the Third Russia-Africa Summit, which will take place in Moscow in October this year.
🔸 Following the meeting, the parties agreed to expand political, economic, and cultural cooperation between the two countries, as well as to arrange training in Russia for staffof the National Elections Commission of South Sudan in preparation for the upcoming presidential elections in December this year.
#Africa#Russia#SouthSudan
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Actual: Djibouti 0:1
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Predicted outcome: South Sudan✅
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Actual: South Sudan 0:4
#Djibouti#SouthSudan
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Predicted outcome: Lesotho❌
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