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function check_dependencies_v1

Maturity: 42

Validates the presence of required Python packages by attempting to import them and returns a list of any missing dependencies.

File:
/tf/active/vicechatdev/email-forwarder/run_service.py
Lines:
17 - 33
Complexity:
simple

Purpose

This function performs a dependency check to ensure all required packages for the application are installed. It iterates through a predefined list of package names, attempts to import each one (handling package name transformations like 'python-dotenv' to 'dotenv'), and collects any packages that fail to import. This is typically used during application startup or installation verification to provide clear feedback about missing dependencies before runtime errors occur.

Source Code

def check_dependencies():
    """Check if required dependencies are installed."""
    required_packages = [
        'aiosmtpd',
        'msal',
        'requests',
        'python-dotenv'
    ]
    
    missing = []
    for package in required_packages:
        try:
            __import__(package.replace('-', '_'))
        except ImportError:
            missing.append(package)
    
    return missing

Return Value

Returns a list of strings containing the names of missing packages. Each string is the pip-installable package name (e.g., 'python-dotenv', 'aiosmtpd'). If all dependencies are installed, returns an empty list. The package names in the returned list match the original package names as they would appear in pip install commands, not their import names.

Dependencies

  • aiosmtpd
  • msal
  • requests
  • python-dotenv

Conditional/Optional Imports

These imports are only needed under specific conditions:

import aiosmtpd

Condition: checked by the function but not required for the function itself to run

Optional 
import msal

Condition: checked by the function but not required for the function itself to run

Optional 
import requests

Condition: checked by the function but not required for the function itself to run

Optional 
from dotenv import load_dotenv

Condition: checked by the function but not required for the function itself to run

Optional

Usage Example

# Check for missing dependencies
missing_packages = check_dependencies()

if missing_packages:
    print(f"Missing packages: {', '.join(missing_packages)}")
    print(f"Install them with: pip install {' '.join(missing_packages)}")
    sys.exit(1)
else:
    print("All dependencies are installed!")
    # Proceed with application startup

Best Practices

  • Call this function early in application startup, before attempting to use any of the checked dependencies
  • The function handles package name transformations (hyphens to underscores) automatically, so 'python-dotenv' is correctly checked as 'dotenv'
  • Use the returned list to provide helpful error messages to users about which packages need to be installed
  • Consider wrapping the function call in a try-except block if you want to handle unexpected errors during the import checks
  • This function only checks if packages can be imported, not if they are the correct versions
  • The function does not install missing packages; it only reports them

Tags

dependency-check validation package-management installation prerequisites import-validation setup

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