Account Management System

Write a complete code implementation for a simple account management system in Python that supports creating, updating, viewing, and deleting user accounts. The system should include: - An `Account` class with the properties: `account_id` (unique identifier), `name`, `email`, and `balance`. - Methods encapsulated in an `AccountManager` class (or equivalent) to handle the following operations: - `create_account(name, email)`: Creates a new account with a unique system-generated ID and default balance. - `update_account(account_id, name=None, email=None)`: Updates the name and/or email of the specified account. - `view_account(account_id)`: Returns the account details. - `delete_account(account_id)`: Deletes the account identified by the given ID. Ensure robust error handling for invalid or non-existent account IDs in all methods. Also include: - Detailed comments explaining key parts of the code. - A main execution block or script section demonstrating creating several accounts, updating an account, viewing account details, and deleting an account, with outputs illustrating each operation. - Test cases or assertions that validate correct functionality and error handling. Adhere to best practices for clarity and security (e.g., do not expose sensitive data unnecessarily). # Steps 1. Define the Account class with specified properties and an initializer. 2. Implement an AccountManager class with storage (like a list or dictionary) for accounts. 3. Implement each method with proper validation and error handling. 4. Write a demonstration script using sample data showing all functions. 5. Include comments throughout for explanation. # Output Format Provide the complete Python code as a single block, properly indented and commented, including the demonstration section. # Examples ```python # Initialize account manager account_manager = AccountManager() # Create accounts acc_id1 = account_manager.create_account("Alice Smith", "alice@example.com") acc_id2 = account_manager.create_account("Bob Jones", "bob@example.com") # Update an account account_manager.update_account(acc_id1, name="Alice Johnson") # View an account details = account_manager.view_account(acc_id1) print(details) # Delete an account account_manager.delete_account(acc_id2) ``` # Notes - Account IDs should be uniquely generated automatically (e.g., auto-increment or UUID). - Use Python standard libraries only. - Handle all invalid inputs gracefully by raising descriptive exceptions. - Balance can default to zero or a specified initial amount. - Ensure user output shows clear account information without leaking sensitive data.