Environment Management

class Environment:
    def __init__(self, prefix=None, python=None, is_venv=False, 
                 base_working_set=None, pipfile=None, sources=None, project=None):
        """
        Initialize an Environment instance.
        
        Parameters:
        prefix (str|Path, optional): Environment prefix path
        python (str, optional): Python executable path
        is_venv (bool): Whether this is a virtual environment
        base_working_set (WorkingSet, optional): Base package working set
        pipfile (dict, optional): Pipfile data
        sources (list, optional): Package sources
        project (Project, optional): Associated project instance
        """

from pipenv.environment import Environment
from pathlib import Path

# Create environment instance
env_path = Path("/path/to/venv")
env = Environment(prefix=env_path)

# Create with specific Python
env = Environment(prefix=env_path, python="/usr/bin/python3.9")

# Create for existing virtualenv
env = Environment(prefix=env_path, is_venv=True)

class Environment:
    # Core properties
    python: str                        # Python executable path
    prefix: Path                       # Environment prefix path
    python_version: str                # Python version string
    sys_path: list[str]               # Python sys.path entries
    base_paths: dict[str, str]        # Environment base paths
    
    # Environment state
    is_venv: bool                     # Is virtual environment
    sources: list                     # Package sources
    pipfile: dict                     # Associated Pipfile data

env = Environment(prefix="/path/to/venv")

# Access environment information
print(f"Python executable: {env.python}")
print(f"Python version: {env.python_version}")
print(f"Environment prefix: {env.prefix}")
print(f"Is virtual environment: {env.is_venv}")

# Check Python paths
print(f"Python sys.path: {env.sys_path}")
print(f"Base paths: {env.base_paths}")

# Access configuration
print(f"Package sources: {env.sources}")

class Environment:
    def get_installed_packages(self):
        """
        Get list of installed packages in environment.
        
        Returns:
        list[Distribution]: List of installed package distributions
        """
    
    def get_outdated_packages(self, pre=False):
        """
        Get packages that have newer versions available.
        
        Parameters:
        pre (bool): Include pre-release versions
        
        Returns:
        list: List of outdated package specifications
        """
    
    def is_installed(self, pkgname):
        """
        Check if a package is installed in the environment.
        
        Parameters:
        pkgname (str): Package name to check
        
        Returns:
        bool: True if package is installed
        """
    
    def is_satisfied(self, req):
        """
        Check if an install requirement is satisfied.
        
        Parameters:
        req (InstallRequirement): Requirement to check
        
        Returns:
        bool: True if requirement is satisfied
        """

from pip._internal.req import InstallRequirement

env = Environment(prefix="/path/to/venv")

# Get all installed packages
installed = env.get_installed_packages()
for pkg in installed:
    print(f"{pkg.project_name}: {pkg.version}")

# Check for outdated packages
outdated = env.get_outdated_packages()
print(f"Outdated packages: {[pkg.project_name for pkg in outdated]}")

# Include pre-releases
outdated_pre = env.get_outdated_packages(pre=True)

# Check specific package installation
is_requests_installed = env.is_installed("requests")
print(f"Requests installed: {is_requests_installed}")

# Check requirement satisfaction
req = InstallRequirement.from_line("requests>=2.25.0")
is_satisfied = env.is_satisfied(req)
print(f"Requirement satisfied: {is_satisfied}")

class Environment:
    def activated(self):
        """
        Context manager for activating the environment.
        
        Returns:
        ContextManager: Context manager that activates environment
        """

import subprocess
import os

env = Environment(prefix="/path/to/venv")

# Use environment context manager
with env.activated():
    # Environment is now activated
    # Python executable points to virtual environment
    result = subprocess.run(["python", "--version"], capture_output=True, text=True)
    print(f"Active Python: {result.stdout.strip()}")
    
    # Environment variables are set
    print(f"VIRTUAL_ENV: {os.environ.get('VIRTUAL_ENV')}")
    print(f"PATH: {os.environ.get('PATH')}")

# Outside context, original environment is restored
print("Environment deactivated")

class Environment:
    def python_info(self):
        """
        Get detailed Python interpreter information.
        
        Returns:
        dict: Python interpreter metadata
        """
    
    def python_implementation(self):
        """
        Get Python implementation name (CPython, PyPy, etc.).
        
        Returns:
        str: Python implementation name
        """

env = Environment(prefix="/path/to/venv")

# Get Python information
python_info = env.python_info()
print(f"Python info: {python_info}")

# Get implementation
implementation = env.python_implementation()
print(f"Python implementation: {implementation}")  # e.g., "CPython"

# Access version details
version_info = python_info.get("version_info", {})
print(f"Python version: {version_info}")

class Environment:
    def script_path(self, script_name):
        """
        Get path to script in environment bin directory.
        
        Parameters:
        script_name (str): Name of script
        
        Returns:
        Path: Path to script executable
        """
    
    def site_packages_path(self):
        """
        Get path to site-packages directory.
        
        Returns:
        Path: Path to site-packages
        """

env = Environment(prefix="/path/to/venv")

# Get script paths
pip_path = env.script_path("pip")
python_path = env.script_path("python")
print(f"Pip executable: {pip_path}")
print(f"Python executable: {python_path}")

# Get site-packages location
site_packages = env.site_packages_path()
print(f"Site-packages: {site_packages}")

# Check if scripts exist
if pip_path.exists():
    print("Pip is available in environment")

from pipenv.project import Project

# Get environment through project
project = Project()
env = project.get_environment()

print(f"Project environment: {env.prefix}")
print(f"Python version: {env.python_version}")

# Use project environment
with env.activated():
    installed = env.get_installed_packages()
    for pkg in installed:
        if pkg.project_name in project.packages:
            print(f"Project package: {pkg.project_name} {pkg.version}")

from pipenv.environment import Environment
import subprocess

# Create standalone environment
env = Environment(prefix="/path/to/standalone/venv")

# Activate and run commands
with env.activated():
    # Install package
    subprocess.run(["pip", "install", "requests"], check=True)
    
    # Verify installation
    if env.is_installed("requests"):
        print("Requests successfully installed")
    
    # Run Python code
    result = subprocess.run([
        "python", "-c", "import requests; print(requests.__version__)"
    ], capture_output=True, text=True)
    print(f"Requests version: {result.stdout.strip()}")

# Compare environments
env1 = Environment(prefix="/path/to/venv1")
env2 = Environment(prefix="/path/to/venv2")

# Compare installed packages
packages1 = {pkg.project_name: pkg.version for pkg in env1.get_installed_packages()}
packages2 = {pkg.project_name: pkg.version for pkg in env2.get_installed_packages()}

# Find differences
only_in_env1 = set(packages1.keys()) - set(packages2.keys())
only_in_env2 = set(packages2.keys()) - set(packages1.keys())
different_versions = {
    pkg for pkg in packages1
    if pkg in packages2 and packages1[pkg] != packages2[pkg]
}

print(f"Only in env1: {only_in_env1}")
print(f"Only in env2: {only_in_env2}")
print(f"Different versions: {different_versions}")

from pipenv.environment import Environment
from pipenv.exceptions import PipenvException

try:
    env = Environment(prefix="/nonexistent/path")
    with env.activated():
        packages = env.get_installed_packages()
except PipenvException as e:
    print(f"Environment error: {e}")
except Exception as e:
    print(f"Unexpected error: {e}")

from pipenv.environment import Environment
from pathlib import Path
import subprocess

# Create custom environment
venv_path = Path.home() / "my_custom_env"

# Create virtual environment
subprocess.run(["python", "-m", "venv", str(venv_path)], check=True)

# Initialize Environment instance
env = Environment(prefix=venv_path, is_venv=True)

# Verify setup
with env.activated():
    print(f"Environment active: {env.python}")
    print(f"Site packages: {env.site_packages_path()}")

import time
from pipenv.environment import Environment

env = Environment(prefix="/path/to/venv")

def monitor_packages():
    """Monitor package changes in environment."""
    last_packages = set()
    
    while True:
        current_packages = {
            pkg.project_name for pkg in env.get_installed_packages()
        }
        
        if current_packages != last_packages:
            added = current_packages - last_packages
            removed = last_packages - current_packages
            
            if added:
                print(f"Added packages: {added}")
            if removed:
                print(f"Removed packages: {removed}")
            
            last_packages = current_packages
        
        time.sleep(5)  # Check every 5 seconds

# monitor_packages()  # Uncomment to run