@thedevs · Post #1984 · 19.07.2022 г., 06:41
Things you should know about databases. #article#databases @thedevs https://kutt.it/xx2Z3i
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Изворен канал @pythonotes · Post #76 · 27 апр.
Ранее я делал серию постов про битовые операторы. Вот вам ещё один наглядный пример как это используется в Python в модуле re. Чтобы указать флаг для компилятора нам надо указать его после передаваемой строки. Например, добавляем флаг для игнорирования переноса строки. pattern = re.compile(r"(\w+)+") words = pattern.search(text, re.DOTALL) А как указать несколько флагов? Ведь явно будут ситуации когда нам потребуется больше одного. Кто читал посты по битовые операторы уже понял как. pattern.search(text, re.DOTALL | re.VERBOSE) А теперь смотрим исходники, что находится в этих атрибутах? Не удивительно, степени двойки. Почему? Потому что каждое следующее значение это сдвиг единицы влево. >>> for n in [1, 2, 4, 8, 16, 32, 64, 128, 256]: >>> print(bin(n)) 0b1 0b10 0b100 0b1000 0b10000 0b100000 0b1000000 0b10000000 0b100000000 Чтобы было понятней, давайте напишем тоже самое но иначе, добавим ведущие нули: 000000001 000000010 000000100 000001000 000010000 000100000 001000000 010000000 100000000 Не понятно что тут происходит? Читай три поста про битовые операторы начиная с этого ➡️https://t.me/pythonotes/45 В общем, это пример применения побитовых операций в самом Python. Теперь вы знаете Python еще немного лучше) #tricks#regex#libs
Пребарај: #databases
@thedevs · Post #1984 · 19.07.2022 г., 06:41
Things you should know about databases. #article#databases @thedevs https://kutt.it/xx2Z3i
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@repo_science · Post #3374 · 30.06.2023 г., 14:57
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@repo_science · Post #3265 · 04.06.2023 г., 22:32
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@repo_science · Post #4219 · 20.10.2024 г., 21:14
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@repo_science · Post #3381 · 03.07.2023 г., 00:51
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@repo_science · Post #3322 · 19.06.2023 г., 22:42
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@repo_science · Post #3402 · 07.07.2023 г., 00:57
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@repo_science · Post #3423 · 11.07.2023 г., 14:22
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@repo_science · Post #3158 · 09.05.2023 г., 20:18
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@githubtrending · Post #14933 · 09.07.2025 г., 12:30
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