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Изворен канал @pythonotes · Post #303 · 27 дек.

Наверняка вы замечали, что в Python есть удобная функция для получения переменной окружения os.getenv(NAME) И её "сестра" для создания или изменения переменных окружения os.putenv(NAME, VALUE) Но почему-то putenv() не работает как должно. Энвайромент не обновляется! os.putenv('MYVAR', '1') print(os.getenv('MYVAR')) ... и ничего 😴 Почему так? На самом деле энвайромент обновляется, но это значение не добавляется в словарь os.environ. Откройте исходник функции os.getenv(). Это просто шорткат для os.environ.get() В то время как putenv() это built-in С-функция. Словарь os.environ (или точней класс из MutableMapping) создаётся из энвайромента в момент инициализации. Функция putenv() самостоятельно его не изменяет. В тоже время, когда вы создаёте или изменяете ключ в os.environ, автоматически вызывается putenv() в методе __setitem__(). То есть, технически putenv() всё делает верно, но в os.environ это не отражается. Можно проверить так: >>> os.putenv('MYVAR', '123') >>> os.system('python -c "import os;print(os.getenv(\'MYVAR\'))"') 123 Я объявил переменную в текущем процессе и вызвал дочерний процесс, который её унаследовал и получил в составе os.environ. Аналогично при удалении переменной вызывается еще одна built-in функция unsetenv(), удаляющая переменную из системы. Итого ▫️ Удобней всего явно обновлять переменные через os.environ ▫️ Есть способ неявно создать/удалить переменную через putenv/unsetenv, что не повлияет на os.environ но изменит энвайромент и передаст изменения сабпроцессам. Но так лучше не делать! ▫️os.environ это просто обертка для built-in функций putenv() и unsetenv(). #basic

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Пронајдени 10 слични објави

Пребарај: #fetusdt

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@propheta_indicator · Post #23419 · 02.03.2026 г., 08:12

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Ai Crypto Signals

@blombardsignal · Post #748 · 25.11.2024 г., 15:00

#FETUSDT The price is moving inside a triangle and the price is heavily accumulated and we expect the downward trendline and the triangle to break upwards. If it breaks, we can expect a good rise.

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Propheta Indicator Signals

@propheta_indicator · Post #23411 · 28.02.2026 г., 10:52

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@propheta_indicator · Post #23779 · 07.05.2026 г., 07:06

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@propheta_indicator · Post #23754 · 20.04.2026 г., 02:11

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@propheta_indicator · Post #23391 · 25.02.2026 г., 18:31

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@propheta_indicator · Post #23558 · 25.03.2026 г., 11:04

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@elfcryptovip · Post #12162 · 16.10.2025 г., 20:02

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