appsettings2

Create a mini-application named 'ConfigMaster' that leverages the 'appsettings2' Python package to manage configuration settings for various components of a system. The application should serve as a centralized configuration management tool, allowing users to define, store, and retrieve configuration settings easily. It will support multiple configuration sources such as environment variables, command-line arguments, and JSON/YAML files, ensuring flexibility and ease of use.

### Core Features:
1. **Configuration Binding**: Users should be able to bind configuration settings to complex objects. For instance, a database connection configuration might include parameters like host, port, username, and password.
2. **Source Prioritization**: Implement a feature where configuration sources have a priority level. For example, command-line arguments should override settings from environment variables, which in turn override default settings from a JSON file.
3. **Dynamic Configuration Updates**: Enable users to update configuration settings dynamically without restarting the application. This could be achieved through a simple API or a user interface.
4. **Secure Configuration Handling**: Provide an option to encrypt sensitive information stored in configuration files, ensuring that even if the files are accessible, the sensitive data remains secure.
5. **Logging and Notifications**: Integrate logging to record changes in configuration settings and send notifications when critical settings are updated.

### Implementation Steps:
1. **Setup Project Structure**: Initialize a new Python project with appropriate directory structure. Include necessary dependencies, including 'appsettings2', in your `requirements.txt` file.
2. **Define Configuration Classes**: Create classes representing different types of configurations (e.g., DatabaseConfig, SecurityConfig). These classes will be used to bind configuration settings using 'appsettings2'.
3. **Implement Source Management**: Use 'appsettings2' to create a Configuration object that combines settings from multiple sources. Define functions to add configuration sources, specifying their type and priority.
4. **Develop Dynamic Update Mechanism**: Design an API endpoint or UI element that allows users to modify configuration settings on-the-fly. Ensure that these updates are reflected in the active Configuration object immediately.
5. **Security Enhancements**: Integrate encryption libraries to handle sensitive data securely. Develop a method within 'ConfigMaster' to automatically encrypt/decrypt configuration values.
6. **Logging and Notification System**: Set up logging to track changes in configuration settings. Implement a notification service that alerts administrators via email or other methods when specific settings are altered.
7. **Testing and Documentation**: Write unit tests to verify the functionality of each component. Prepare comprehensive documentation explaining how to install, configure, and use 'ConfigMaster'.

By following these steps and utilizing the 'appsettings2' package effectively, you'll develop a robust and flexible configuration management solution that can be integrated into various applications.