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
🚨 Five fresh addresses jointly accumulated a massive amount of 46.816M $STORJ (currently worth $23.9M), or 11% of the total supply, from Binance and OKX over the past month.
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🚨 Whales are leaving the plummeting $MKR for the newly pumped $ETH!
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🔥🔥$IMX price is up 33% in the past hour, and you can predict it in advance with #SpotOnChain!🔥🔥
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🚨 IOSG Ventures just transferred 1,542 $ETH ($2.9M), 3.95M $1INCH ($1.31M) and 352K $UNI ($1.69M) #Binance.
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🚨 $DYDX ranks 4th in #SpotOnChain's Smart Money Outflow, with a large flow to CEX from whales.
Notably, three whales deposited 4.08M $DYDX ($13.9M) to exchanges in the last 12 hours:
1. Whale 0xb0d (likely Amber Group) deposited 2.37M $DYDX ($8.04M, avg price: $3.39) to #Binance ~3hrs ago.
- The whale deposited 9.2M $DYDX ($29.8M, avg price: $3.24) to #Binance since the unlock on Dec 1.
- Current holding: 3.26M $DYDX ($11.27M), which may be deposited to Binance soon.
2. Whale 0x01a deposited 1.2M $DYDX ($4.09M) to #Kraken at $3.41 ~4hrs ago.
- Estimated profit: $274K (+7.19%) in just 2 days.
- Current holding: 2.81M $DYDX ($9.71M).
3. CMS Holdings moved 516,023 $DYDX ($1.73M) to #Binance deposit address ~11hrs ago.
- Estimated realized profit: $2.66M if selling now.
- The VC no longer holds $DYDX on the Ethereum chain.
👉 More details: https://platform.spotonchain.ai/signal-details/whales-deposited-dydx-amid-the-market-rally-9197
🚨 $BTC price rose above $36K again today!
Note that #US Goverment still holds a large amount of 194,695 $BTC ($7.14B).
- Their $BTC value just increased by $208M after the $BTC pumped by 3%+ in the past 24 hours.
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🎉🎉 FTX debtors may have 391M$ more thanks to $FTT recent pump!
➡️ $FTT surged by 117% due to a potential reboot of FTX crypto exchange
➡️ FTX and Alameda addresses hold ~267M $FTT (76% of the total supply)
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🔥🔥DWF Labs started accumulating meme coins #PEPE and #FLOKI
➡️ 121M $PEPE ($100) was withdrawn from Binance to the DWF Labs address an hour ago. Is it a fake signal or a test transaction from the team?
➡️ received 15.8B $FLOKI (~$300K) from Floki dev and deposited them to Binance 8 hours ago
Details can be tracked at https://platform.spotonchain.ai/entity/122
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🎉 Hello, 2025, from SpotOnChain!
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🚨 $BLUR price is down by ~8% in the past 24 hours.
We noticed that #Wintermute and #MandalaCapital deposited 5.61M $BLUR ($2.83M) to #OKX in the past 14 hours.
1. Wintermute Trading deposited 2.85M $BLUR ($1.44M, price: $0.51) ~ 14hrs ago.
2. Mandala Capital unstaked and deposited 2.76M $BLUR ($1.39M, price: $0.5) ~ 7hrs ago, realizing a slight estimated loss of $77K (-5.21%) from $BLUR.
⚠️ Moreover, #SpotOnChain shows real-time CEX netflow. It is easy to see many strong positive spikes in the past 24 hours, indicating that more whales were also depositing $BLUR away!
👉 More details: https://platform.spotonchain.ai/signal-details/two-institutions-moved-blur-to-okx-10353