venv बनाना और सक्रिय करना

# Terminal:
# python -m venv .venv
# Creates: .venv/bin/python, .venv/lib/, .venv/pyvenv.cfg
print('create demo')

# macOS/Linux:
# source .venv/bin/activate
# Prompt changes to (.venv) user@host...
print('unix activate demo')

# Windows CMD:
# .venv\Scripts\activate.bat
# Windows PowerShell:
# .venv\Scripts\Activate.ps1
print('windows activate demo')

import sys
print(sys.prefix)
# Check if inside venv:
print(sys.prefix != sys.base_prefix)

# Terminal:
# deactivate
# Prompt returns to normal
print('deactivate demo')

# (with venv active):
# pip install requests
# pip install flask==3.0.0
print('isolated install demo')

# python -m venv .venv --prompt myproject
# Creates venv with custom prompt: (myproject)
print('venv options demo')

# (with venv active):
# python -m pip install --upgrade pip
print('upgrade pip demo')

# VS Code settings.json:
# {"python.defaultInterpreterPath": ".venv/bin/python"}
print('ide demo')

import sys
in_venv = sys.prefix != sys.base_prefix
print('In venv:', in_venv)