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

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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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GBP/JPY FOREX

@gbpjpysignalfx · Post #82324 · 14.05.2026 г., 15:56

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GBP/JPY FOREX

@gbpjpysignalfx · Post #81473 · 25.04.2026 г., 15:01

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GOLD FX SIGNALS 🔔

@gold_fx_trading_oi · Post #56778 · 08.10.2024 г., 17:28

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EURUSD USDJPY GBPUSD SIGNALS

@eurusdusdjpygbpusdsignalsfx · Post #79869 · 07.03.2026 г., 07:46

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Jordi Visser

@jvisserlabs · Post #23438 · 25.10.2025 г., 17:29

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The Crypto Network ™️

@thcryptonetwok · Post #10629 · 10.09.2024 г., 08:41

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The Crypto Network ™️

@thcryptonetwok · Post #9675 · 20.07.2024 г., 07:25

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Trading Pit Signals🎖️

@trading_pit_signal · Post #34139 · 23.04.2024 г., 16:29

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Trading Pit Signals🎖️

@trading_pit_signal · Post #34127 · 08.02.2024 г., 19:54

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Trading Pit Signals🎖️

@trading_pit_signal · Post #33799 · 03.02.2024 г., 08:59

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Trading Pit Signals🎖️

@trading_pit_signal · Post #33331 · 27.01.2024 г., 12:46

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GOLD FX SIGNALS 🔔

@gold_fx_trading_oi · Post #57382 · 18.10.2024 г., 18:06

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