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
😄Feature
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😜 Best Funny Video @Funnys
😄Feature
➖➖➖➖➖➖
🔘A feature is an element of something interesting or important.
🔜The number of parks is an important feature of the city.
It it also used as a general label for the parts of our faces.
🔘My big nose is my least favourite feature.
🔜When we want to say what is included in something, we use feature. Often it's important that they're there.
🔘This phone features an amazing camera.
🔜Just remember, we use the word feature to talk about interesting or important things.
#feature👨🏫@America
➖➖➖➖➖➖➖➖➖➖➖➖
🆕 Crypto News @Money
😁 Crypto Game @Egame
🇺🇸 US News @America
🇯🇵 Japan News @Japan
🇦🇪 UAE News @Dubai
▶️ Popular Movies @Videos
😜 Best Funny Video @Funnys
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The last words you Said
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These beautiful clouds and cold Wheather ,
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#review
#poem
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The last time we met
The last words you Said
were not just words ,
But bullets in my lungs .
These beautiful clouds and cold Wheather ,
Reminds me of the moments we spent together .
Celebrating first Eid in your absence ,
Makes me guilty for my existence.
Scrolling through my WhatsApp
these days,
feels that life has left me no ways
I always felt happy whenever we met ,
But now ,
Your name forces me to regret ,
Your wait compels me to forget ,
And , even your thoughts pierces my heart.
-CH.Irfan.
#review
#poem
#feature
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Yangi featureʼlarni sinash uchun Alfa versiyasiga yozilmoqchiman. Agar qiziqarli narsa bo‘lsa, kanalimda yozaman.
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