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
👍 This is why we're here!
Reached 9th TP in the VIP HTL channel!
$308 in profits with a 5% entry and a $1000 deposit!
VIPs getting filthy rich by the day ☺️🤑🤑ACCESS TO MANUAL TRADING for 45usdt/month
👉 Looking at those reports and can't believe what you're seing?
Go to our reports channel and audit us! @propheta_reports
Register and get bonuses up to $6,000
Binance | OKX | ByBit👈🏻click!
#buycrypto#cryptochannel#trading
👍 This is why we're here!
Reached 9th TP in just 7 hours in the VIP HTL channel!
With a 5% entry and a $1000 deposit, you could've earned $206!
ACCESS TO MANUAL TRADING for 70usdt/month
📊Dominate the market with Propheta AI Analyzer: AI uncovers hidden patterns with razor-sharp analysis, adapts on the fly with slick customization, and delivers next-level pair hunting — your edge for strategic supremacy! GET THE ACCESS
Register and get bonuses up to $6,000
Binance | OKX | ByBit👈🏻click!
#passiveincome#cryptobot#cryptochannel
Reached 9th TP in the VIP PRO channel!
ACCESS TO MANUAL TRADING for 70usdt/month
👉 In our VIP community, not only will your deposit grow, but your skill as a trader as well!
Register and get bonuses up to $6,000
Binance | OKX | ByBit👈🏻click!
#cryptochannel#buybtc#crypto
Oops, we did it again 🤣
Reached 9th TP in the VIP PRO channel!
You could've earned $603 with a 5% entry and a $1000 deposit!
Feels good to be a Propheta VIP, man... 🏖ACCESS TO MANUAL TRADING for 70usdt/month
👉 Multiplying deposits every day!
Not convinced? Contact us for a free trial - @propheta_help
Register and get bonuses up to $6,000
Binance | OKX | ByBit👈🏻click!
#AItrader#passiveincome#cryptochannel
Reached 9th TP in just 3 hours in the VIP PRO channel!
Easy $513 with a 5% entry and a $1000 deposit!
Every day we're on fire! 🔥🔥🔥ACCESS TO MANUAL TRADING for 70usdt/month
👉 Time to start earning for real!
Join us >>> t.me/ProphetaAdmin_bot
Register and get bonuses up to $6,000
Binance | OKX | ByBit👈🏻click!
#cryptochannel#signalchannel#AItrader
Reached 9th TP in the VIP HTL channel!
You could've earned $214 with a 5% entry and a $1000 deposit!
VIPs getting filthy rich by the day ☺️🤑🤑ACCESS TO MANUAL TRADING for 70usdt/month
👉 Time to start earning for real!
Join us >>> t.me/ProphetaAdmin_bot
Register and get bonuses up to $6,000
Binance | OKX | ByBit👈🏻click!
#cryptochannel#buyeth#bitcoin
👆 Propheta living up to its name yet again 🔮
Reached 9th TP in just 1 hour in the VIP HTL channel!
You could've earned $306 with a 5% entry and a $1000 deposit!
🤑 All this profit could have been yours! 🔥ACCESS TO MANUAL TRADING for 70usdt/month
👉 Did you know that many traders use our performance reports to build their own trading strategy? That's how useful they are! Check them out: @propheta_reports
Register and get bonuses up to $6,000
Binance | OKX | ByBit👈🏻click!
#cryptonews#indicator#cryptochannel
👀 Well, would you look at that! 👆
#ENAUSDT has just reached 9th TP in the VIP CLUB channel!!!👍
With a 5% entry and a $1000 deposit, you could've earned $461!
Every day we're on fire! 🔥🔥🔥ACCESS TO MANUAL TRADING for 70usdt/month
👉 Not sure? Considering? Contemplating? Come have a look at our performance reports, spend about5 minutes and see for yourself that everything is 100% legit! @propheta_reports
Register and get bonuses up to $6,000
Binance | OKX | ByBit👈🏻click!
#AItrader#cryptobot#cryptochannel
#ENAUSDT reached 9th TP!
Signal from our VIP HTL channel!
You could've earned $302 with a 5% entry and a $1000 deposit!
VIPs getting filthy rich by the day ☺️🤑🤑ACCESS TO MANUAL TRADING for 70usdt/month
👉 Did you know that our referral partners receive extra discounts, even cumulative with the special offer prices?
START >>> Referral Program
Register and get bonuses up to $6,000
Binance | OKX | ByBit👈🏻click!
#cryptochannel#signalchannel#cryptobot
Oops, we did it again 🤣
#ENAUSDT reached 9th TP in under 2 days!
Signal from our VIP PRO channel!
With a 5% entry and a $1000 deposit, you could've earned $603!
VIPs getting filthy rich by the day ☺️🤑🤑ACCESS TO MANUAL TRADING for 70usdt/month
👉 Looking at those reports and can't believe what you're seing?
Go to our reports channel and audit us! @propheta_reports
Register and get bonuses up to $6,000
Binance | OKX | ByBit👈🏻click!
#cryptochannel#buybtc#tradingindicator
Oops, we did it again 🤣
Reached 9th TP in 1 day on our #ENAUSDT trade! 🔥🔥🔥
Using a 5% entry you could've earned $462 with a $1000 deposit
ACCESS TO MANUAL TRADING for 70usdt/month
👉 It's time to get a moneyprinter of your own!
Get access: t.me/ProphetaAdmin_bot
Register and get bonuses up to $6,000
Binance | OKX | ByBit👈🏻click!
#cryptochannel#btc#CryptoSignal
Reached 9th TP in 14 hours on our #BBUSDT trade! 🔥🔥🔥
Using a 5% entry you could've earned $199 with a $1000 deposit
ACCESS TO MANUAL TRADING for 70usdt/month
👉 It's time to get a moneyprinter of your own!
Get access: t.me/ProphetaAdmin_bot
Register and get bonuses up to $6,000
Binance | OKX | ByBit👈🏻click!
#cryptochannel#bitcoin#AItrading