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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 29 слични објави

Пребарај: #lassafeverinfo

当前筛选 #lassafeverinfo清除筛选

#Lassafeverinfo Our latest Lassa Fever Situation Report has been published on our website (week 23). This week's situation report and that of previous weeks can be downloaded via https://ncdc.gov.ng/diseases/sitreps/?cat=5&name=An%20update%20of%20Lassa%20fever%20outbreak%20in%20Nigeria

#Lassafeverinfo Our latest Lassa Fever Situation Report has been published on our website (week 22). This week's situation report and that of previous weeks can be downloaded via https://ncdc.gov.ng/diseases/sitreps/?cat=5&name=An%20update%20of%20Lassa%20fever%20outbreak%20in%20Nigeria

#Lassafeverinfo Our latest Lassa Fever Situation Report has been published on our website (week 6). In this reporting week, a total of 68 confirmed cases were recorded. This week's situation report and that of previous weeks can be downloaded via https://ncdc.gov.ng/diseases/sitreps/?cat=5&name=An%20update%20of%20Lassa%20fever%20outbreak%20in%20Nigeria

#Lassafeverinfo Our latest Lassa Fever Situation Report has been published on our website (week 4). This week's situation report and that of previous weeks can be downloaded via https://ncdc.gov.ng/diseases/sitreps/?cat=5&name=An%20update%20of%20Lassa%20fever%20outbreak%20in%20Nigeria

#Lassafeverinfo Our latest Lassa Fever Situation Report has been published on our website (week 2). This week's situation report and that of previous weeks can be downloaded via https://ncdc.gov.ng/diseases/sitreps/?cat=5&name=An%20update%20of%20Lassa%20fever%20outbreak%20in%20Nigeria

#Lassafeverinfo Our latest Lassa Fever Situation Report has been published on our website (week 49). This week's situation report and that of previous weeks can be downloaded via https://ncdc.gov.ng/diseases/sitreps/?cat=5&name=An%20update%20of%20Lassa%20fever%20outbreak%20in%20Nigeria

In total for 2024, 1035 confirmed cases of #LassaFever have been recorded across 28 States in Nigeria. 🔗Download, read, and share our latest #LassaFever situation report via: https://ncdc.gov.ng/diseases/sitreps/?cat=5&name=An%20update%20of%20Lassa%20fever%20outbreak%20in%20Nigeria #LassaFeverInfo

In total for 2024, 1018 confirmed cases and 172 deaths of #LassaFever have been recorded across 28 States in Nigeria. 🔗Download, read, and share our latest #LassaFever situation report via: https://ncdc.gov.ng/diseases/sitreps/?cat=5&name=An%20update%20of%20Lassa%20fever%20outbreak%20in%20Nigeria #LassaFeverInfo

In total for 2024, 1005 confirmed cases of #LassaFever have been recorded across 28 States in Nigeria. 🔗Download, read, and share our latest #LassaFever situation report via: https://ncdc.gov.ng/diseases/sitreps/?cat=5&name=An%20update%20of%20Lassa%20fever%20outbreak%20in%20Nigeria #LassaFeverInfo

In this week's #LassaFever situation report, we provide a summary of the epidemiological situation and response activities in Nigeria. 🔗Download, read, and share via https://ncdc.gov.ng/diseases/sitreps/?cat=5&name=An%20update%20of%20Lassa%20fever%20outbreak%ll20in%20Nigeria #LassaFeverInfo

In this week's #LassaFever situation report, we provide a summary of the epidemiological situation and response activities in Nigeria. 🔗Download, read, and share via https://ncdc.gov.ng/diseases/sitreps/?cat=5&name=An%20update%20of%20Lassa%20fever%20outbreak%ll20in%20Nigeria #LassaFeverInfo

You can not be too safe! #Lassafever presents with symptoms similar to those of many illnesses like malaria. Healthcare workers are urged to always have a high index of suspicion and practice standard infection prevention and control measures when attending to patients. #LassafeverInfo

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