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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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Amazing Geography 🌍

@amazingeo · Post #622 · 09.02.2026 г., 12:31

🌍 Some rainforest insects mimic leaves so perfectly they even show “bite marks” or rot spots on their bodies, hiding from predators in the dense, shadowy understory. ✨ #rainforest⚡#biodiversity⚡#adaptation⚡#geography⚡#nature⚡#earth 👉subscribe Amazing Geography 👉more Channels ​

Amazing Geography 🌍

@amazingeo · Post #528 · 21.12.2025 г., 20:31

🌍 Terraced vineyards on Portugal's Douro River show how people reshape steep hillsides for farming. Ancient stone walls protect soil from erosion while letting grape vines thrive in harsh terrain. ✨ #agriculture⚡#landscape⚡#adaptation⚡#geography⚡#nature⚡#earth 👉subscribe Amazing Geography 👉more Channels ​

Amazing Geography 🌍

@amazingeo · Post #17 · 10.08.2025 г., 10:26

🌍 Terraced rice fields in Southeast Asia transform steep hillsides into farmable land, reducing soil erosion and creating unique landscapes shaped by both nature and human ingenuity. ✨ #agriculture⚡#landscape⚡#adaptation⚡#geography⚡#nature⚡#earth 👉subscribe Amazing Geography🌍

Interesting Planet 🌍

@interesting_planet_facts · Post #987 · 29.10.2025 г., 18:11

🌎 The male seahorse is the only animal where the male becomes pregnant, carrying fertilized eggs in a special pouch until they hatch. Seahorses can give birth to hundreds of fully formed young at a time—up to 2,000 in a single brood. ✨ #adaptation⚡#animals⚡#ocean 👉subscribe Interesting Planet 👉more Channels ​

Amazing Geography 🌍

@amazingeo · Post #547 · 31.12.2025 г., 12:31

🌍 In tundra landscapes, some mosses and lichens can survive temperatures below –50°C and continue to photosynthesize under snow, making them some of the Earth’s hardiest plants. ✨ #tundra⚡#permafrost⚡#adaptation⚡#geography⚡#nature⚡#earth 👉subscribe Amazing Geography 👉more Channels ​

Amazing Geography 🌍

@amazingeo · Post #310 · 29.09.2025 г., 12:31

🌍 The Galápagos Islands are home to the only marine iguanas on Earth. These unique lizards swim and dive in the Pacific Ocean, making them the world’s only sea-going reptiles. ✨ #islands⚡#wildlife⚡#adaptation⚡#geography⚡#nature⚡#earth 👉subscribe Amazing Geography 👉more Channels ​

Amazing Geography 🌍

@amazingeo · Post #24 · 10.08.2025 г., 13:59

🌍 Urban green roofs, where buildings are topped with plants, help cities manage rainwater, reduce heat, and provide habitats for birds and insects, blending urban life with nature. ✨ #cities⚡#environment⚡#adaptation⚡#geography⚡#nature⚡#earth 👉subscribe Amazing Geography🌍

Amazing Geography 🌍

@amazingeo · Post #509 · 12.12.2025 г., 12:31

🌍 In tropical rainforests, some plant leaves grow waxy surfaces and pointed tips called "drip tips." These features help water run off quickly, stopping mold and fungi in the damp climate. ✨ #rainforest⚡#tropics⚡#adaptation⚡#geography⚡#nature⚡#earth 👉subscribe Amazing Geography 👉more Channels ​

Amazing Geography 🌍

@amazingeo · Post #120 · 26.08.2025 г., 13:12

🌍 Earth’s climate zones are not just about temperature—they also shape which plants and animals can survive. Some cacti thrive in deserts, while rainforests burst with life in tropical zones. ✨ #climate⚡#vegetation⚡#adaptation⚡#geography⚡#nature⚡#earth 👉subscribe Amazing Geography🌍 ​

Interesting Planet 🌍

@interesting_planet_facts · Post #539 · 11.08.2025 г., 03:22

🌎 The star-nosed mole detects prey in total darkness using its unique nose, covered in 22 finger-like tentacles packed with touch sensors. This extraordinary adaptation lets it identify and eat tiny insects and worms faster than any other mammal, even underwater. ✨ #animals⚡#adaptation⚡#evolution 👉subscribe Interesting Planet

Amazing Geography 🌍

@amazingeo · Post #663 · 16.03.2026 г., 20:31

🌍 Tropical savannas can burn naturally every 1–3 years, yet some species, like the baobab tree, thrive by storing water in thick trunks to survive both drought and fire. ✨ #savanna⚡#grassland⚡#adaptation⚡#geography⚡#nature⚡#earth 👉subscribe Amazing Geography 👉more Channels ​

Amazing Geography 🌍

@amazingeo · Post #503 · 09.12.2025 г., 12:31

🌍 In Chile's Atacama Desert, rare fog called "camanchaca" drifts inland from the Pacific. Some plants here survive by absorbing water directly from this fog, not from rainfall. ✨ #desert⚡#arid⚡#adaptation⚡#geography⚡#nature⚡#earth 👉subscribe Amazing Geography 👉more Channels ​

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