Мы уже знаем, что на текущую сессию интерпретатора изменение PYTHONPATH никак не повлияет. Но если вы запустите дочерний процесс, то он унаследует окружение текущего процесса, а значит и изменения в любых переменных будут на него влиять.
Вот небольшой пример:
Объявляем переменную
user@host:~$ export PYTHONPATH=/path1
Запускаем интерпретатор
user@host:~$ python3
Проверим что в sys.path
>>> import sys
>>> print(sys.path)
['', '/path1', '/usr/lib/...', ...]
Добавляем что-то в переменную
>>> import os
>>> os.emviron['PYTHONPATH'] = '/path1:/path2'
>>> print(sys.path)
['', '/path1', '/usr/lib/...', ...]
Изменений нет. Но давайте запустим дочерний процесс и посмотрим там
>>> os.system('python3')
# теперь мы находимся в другом процессе
>>> import sys
>>> print(sys.path)
['', '/path1', '/path2', '/usr/lib/...', ...]
Тоже самое будет и с subprocess, так как по умолчанию текущее окружение тоже наследуется.
>>> import subprocess
>>> subprocess.call(['python3', '-c', 'import sys;print(sys.path)'])
['', '/path1', '/path2', '/usr/lib/...', ...]
______________________
Лучшей практикой является передача энвайронмента явно через аргумент env!
import subprocess
subprocess.call(cmd, env={'PYTHONPATH': '...'})
Это поможет точно понимать какое окружение будет у запускаемого процесса и при этом не изменять окружение текущего процесса.
#basic
Indian Railways has officially issued the Gazette Notification for operationalizing the new South Coast Railway Zone.
🔹 Divisions included:
• Visakhapatnam
• Vijayawada
• Guntur
• Guntakal
#Railways
South Central #Railways seeks ~1,125 acres in Telangana for 4 mega coaching terminals around Hyderabad—sites at Dabilpur (250 acres), Nagulapalli (325), Jukkal (300) and Cherlapalli expansion (250). Plan aims to decongest Secunderabad/Hyderabad/Kacheguda hubs.
Indian Railways Approves ₹895.30 Crore Projects for Power System Upgradation and Bridge Infrastructure
₹671.72 Cr Kolkata Metro Upgrade with 7 New Traction Substations and Power System Augmentation from 11KV to 33 KV for Higher Frequency & Capacity Expansion
Approvals to Pave Way for 2.5-Minute Metro Headway Upgrade from Existing 5-Minute Operations, Boosting Line Capacity to Meet Rising Passenger Demand
₹223.58 Cr Adra Bridge Project to Strengthen Critical Freight Route and Industrial Connectivity
#Railways
«Узтемирйулконтейнер» преобразовался в «Темирйулкарго»🇺🇿🚆
Не только новое название, но и новые услуги:
• по управлению грузоперевозками «от двери до двери»
• по формированию логистических центров и терминалов
• по созданию логистических цепочек поставок грузов с функцией оперирования мультимодальными логистическими терминалами за рубежом
Очень интересно, что из этого получится🚂
#UZBEKISTAN#RAILWAYS
Sikkim’s first railway station Rangpo Terminal takes shape on the Sivok Rangpo line 🚄🇮🇳
▪️ B+G+5 with local Architecture on 16.5 acres
▪️ Cost : ₹335+ Cr
▪️ Promoter : Northeast Frontier Railway Division
▪️ Contractor : IRCON International Limited
▪️ Status : Under Construction
#Railways#Infra
Railways has set a target to complete the Detailed Project Reports (DPRs) for three bullet train corridors by March 2027. These include the Hyderabad-Chennai, Hyderabad-Bengaluru and Patna-Siliguri.
#Railways#Infra
#Railways Minister Ashwini Vaishnaw inaugurates Aditya, BEML’s self reliant high speed bullet train plant in Bengaluru 🚄🇮🇳
The facility will build indigenous B28 trains and future B35 next gen sets, boosting Bharat’s push for advanced, homegrown high speed rail. #aatmarnirbharbharat
Ashvini Vaishnaw:
India’s Aatmanirbhar bullet train B28 is being developed with manufacturing at BEML’s Aditya plant equipped with advanced, high precision machines, including robotic laser welding systems. 🚄🇮🇳
🇮🇳🤝🇧🇩 Bangladesh is moving ahead with a significant upgrade of its railway network, with plans to procure 200 broad-gauge passenger coaches from India in a deal to strengthen capacity and improve services across key routes.
#Railways Minister Shaikh Rabiul Alam informed Parliament that deliveries are scheduled to begin in 2026 and will continue in phases until December 2027 #Exports
https://swarajyamag.com/news-brief/bangladesh-to-induct-200-indian-broad-gauge-coaches-by-2027-signals-wider-fleet-expansion
Indian #Railways is delivering transformation at scale: 55,000 km of track renewed since 2014, 90% fewer rail failures, and track running at 110 kmph+ has risen from 40% to 80%. 🛤🚉
Indian Railways carries 25,000+ trains and 20 million+ passengers daily. Over 80,000 km of stronger rail network, 44,000 km of upgraded sleepers, and 8,00,000 machine-hours logged.
When the backbone improves, the impact multiplies across safety, punctuality, logistics, and productivity. That is nation-building in motion. #Reforms#Infra