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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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Interesting Planet 🌍

@interesting_planet_facts · Post #1190 · 04.01.2026 г., 12:11

🌎 Some mid-ocean ridges, like the Mid-Atlantic Ridge, are areas where new seafloor is constantly created as tectonic plates move apart. Hydrothermal vents along these ridges support unique ecosystems, including tube worms and giant clams, which thrive in total darkness using chemical energy instead of sunlight. ✨ #ocean⚡#geology⚡#biodiversity 👉subscribe Interesting Planet 👉more Channels ​

Interesting Planet 🌍

@interesting_planet_facts · Post #586 · 19.08.2025 г., 00:22

🌎 Deep beneath the Caribbean Sea, the deepest known blue hole—Dean’s Blue Hole—plunges over 200 meters. Its tight entrance leads to vast, vertical caverns, hosting unique marine life adapted to total darkness and low oxygen levels. ✨ #geology⚡#ocean⚡#biodiversity 👉subscribe Interesting Planet

Amazing Geography 🌍

@amazingeo · Post #637 · 17.02.2026 г., 12:31

🌍 Some gold mines today reach over 4,000 meters deep underground, making them among the deepest human-made structures on Earth. Special cooling systems are needed to keep miners safe from extreme heat. ✨ #mining⚡#resources⚡#geology⚡#geography⚡#nature⚡#earth 👉subscribe Amazing Geography 👉more Channels ​

Amazing Geography 🌍

@amazingeo · Post #497 · 06.12.2025 г., 12:31

🌍 The Atlantic Ocean is expanding as the Americas move away from Europe and Africa. This slow drift adds about 2.5 centimeters of new seafloor every year along the Mid-Atlantic Ridge. ✨ #continents⚡#ocean⚡#geology⚡#geography⚡#nature⚡#earth 👉subscribe Amazing Geography 👉more Channels ​

Amazing Geography 🌍

@amazingeo · Post #309 · 28.09.2025 г., 20:31

🌍 The Mid-Atlantic Ridge runs down the center of the Atlantic Ocean, forming the world’s longest mountain chain—most of it hidden beneath the sea between continents. ✨ #continents⚡#ocean⚡#geology⚡#geography⚡#nature⚡#earth 👉subscribe Amazing Geography 👉more Channels ​

Amazing Geography 🌍

@amazingeo · Post #352 · 09.10.2025 г., 18:31

🌍 Mount Etna in Italy is one of the world’s most active volcanoes, but it’s also growing taller each year as repeated eruptions pile new layers of lava onto its summit. ✨ #mountains⚡#volcanoes⚡#geology⚡#geography⚡#nature⚡#earth 👉subscribe Amazing Geography 👉more Channels ​

Amazing Geography 🌍

@amazingeo · Post #686 · 09.04.2026 г., 20:31

🌍 Earth’s crust floats on a soft, slowly flowing layer below called the mantle. This motion is what powers earthquakes, volcanoes, and shapes continents over millions of years. ✨ #earth⚡#geology⚡#mantle⚡#geography⚡#nature 👉subscribe Amazing Geography 👉more Channels ​

Amazing Geography 🌍

@amazingeo · Post #613 · 04.02.2026 г., 20:31

🌍 Some earthquake "swarms" can hit the same spot repeatedly over weeks or months, releasing energy in small bursts instead of one big quake—often in volcanic or tectonic hot zones. ✨ #earthquakes⚡#tectonics⚡#geology⚡#geography⚡#nature⚡#earth 👉subscribe Amazing Geography 👉more Channels ​

Amazing Geography 🌍

@amazingeo · Post #575 · 14.01.2026 г., 12:31

🌍 The planet’s largest earthquake ever measured—a magnitude 9.5—struck Chile in 1960. This event released so much energy it caused land to drop by up to two meters along the coast. ✨ #tectonics⚡#earthquakes⚡#geology⚡#geography⚡#nature⚡#earth 👉subscribe Amazing Geography 👉more Channels ​

Amazing Geography 🌍

@amazingeo · Post #534 · 24.12.2025 г., 20:31

🌍 One of the fastest-moving tectonic faults is in Turkey, with plates shifting up to 23 millimeters per year. This constant motion makes the region prone to frequent, sometimes devastating earthquakes. ✨ #tectonics⚡#earthquakes⚡#geology⚡#geography⚡#nature⚡#earth 👉subscribe Amazing Geography 👉more Channels ​

Amazing Geography 🌍

@amazingeo · Post #502 · 08.12.2025 г., 20:31

🌍 Some tectonic plate boundaries move so slowly they create “silent earthquakes”—huge shifts that happen over days or weeks, releasing energy without sudden shaking. ✨ #tectonics⚡#earthquakes⚡#geology⚡#geography⚡#nature⚡#earth 👉subscribe Amazing Geography 👉more Channels ​

Amazing Geography 🌍

@amazingeo · Post #234 · 14.09.2025 г., 09:12

🌍 Some large earthquakes can trigger aftershocks that last for months or even years. These smaller quakes are part of the Earth’s ongoing adjustment after a major tectonic shift. ✨ #tectonics⚡#earthquakes⚡#geology⚡#geography⚡#nature⚡#earth 👉subscribe Amazing Geography🌍 ​

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