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
Senior Veterinarian (Senior Animal Health Expert).
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DVM, Master's, Bachelor's Degree, or Advanced Diploma, in Veterinary Technology, Veterinary Science, or in a related field of study with relevant work experience
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Senior Veterinarian (Senior Animal Health Expert).
#adama_investment_group
#health_care
#Adama
DVM, Master's, Bachelor's Degree, or Advanced Diploma, in Veterinary Technology, Veterinary Science, or in a related field of study with relevant work experience
Quanitity Required: 2
Minimum Years Of Experience: #0_years
Maximum Years Of Experience: #8_years
Salary: 23676.00
Deadline: January 8, 2025
How To Apply: Submit your non-returnable application and CV along with supporting documents in person to the Human Resource Director of AIG located at Adama City, Abba Gada Sub City - In front of Tele Garage
Senior Veterinarian (Senior Animal Health Expert).
#adama_investment_group
#health_care
#Adama
DVM, Master's, Bachelor's Degree, or Advanced Diploma, in Veterinary Technology, Veterinary Science, or in a related field of study with relevant work experience
Quanitity Required: 2
Minimum Years Of Experience: #0_years
Maximum Years Of Experience: #8_years
Salary: 23676.00
Deadline: January 8, 2025
How To Apply: Submit your non-returnable application and CV along with supporting documents in person to the Human Resource Director of AIG located at Adama City, Abba Gada Sub City - In front of Tele Garage
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The law covers construction projects from 2013 to 2026 that meet the criteria but excludes some residents from facing demolition. This contradicts Article 25 of #Ethiopia’s Constitution and treaties like the #ICCPR. The regulation also fails Lon Fuller’s "internal morality of law" and exceeds the Council’s authority under Proclamation No. 242/2021.
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https://addisstandard.com/?p=56238
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In a statement sent to Addis Standard today, the party said the planned demonstrations will take place in several major cities, including #Addis_Abeba, #Mekelle, #Bahir_Dar, #Gondar, #Hawassa, #Adama, and #Ambo, urging #Ethiopians to join what it described as a peaceful effort to demand political reforms.
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Read more: https://addisstandard.com/?p=56410