"""Create fallback_executor
Generated by Phi-Octopus Eden
2025-11-06 14:59:19.911994
"""

```python
from typing import Any, Callable, Dict, Optional


class FallbackExecutor:
    """
    A class for creating a fallback mechanism that executes different functions based on their success or failure.

    :param primary_function: The main function to be executed.
    :param fallback_functions: A dictionary containing backup functions where the key is the error type and value
                               is the function to execute when an exception of that type occurs.
    """

    def __init__(self, primary_function: Callable[[], Any], fallback_functions: Dict[type, Callable[[], Any]]):
        self.primary_function = primary_function
        self.fallback_functions = fallback_functions

    def run_with_fallback(self) -> Optional[Any]:
        """
        Execute the primary function. If it fails with an error type that has a registered fallback,
        execute the fallback function.
        :return: The result of the executed function or None if an unhandled exception occurs.
        """
        try:
            return self.primary_function()
        except Exception as e:
            for exc_type, fallback_func in self.fallback_functions.items():
                if isinstance(e, exc_type):
                    return fallback_func()
            print(f"Unhandled error: {e}")
            return None


# Example usage
def main_function() -> int:
    """Divide 10 by 2 and return the result."""
    return 10 / 2

def division_by_zero_fallback() -> float:
    """Handle division by zero exception with a fallback value."""
    print("Error: Division by zero is not allowed. Using fallback value.")
    return 5.0

def unexpected_exception_fallback() -> str:
    """Fallback for any other exceptions."""
    print("An unexpected error occurred. Returning an error message.")
    return "Error"

# Create instance of FallbackExecutor
executor = FallbackExecutor(
    primary_function=main_function,
    fallback_functions={
        ZeroDivisionError: division_by_zero_fallback,
        Exception: unexpected_exception_fallback
    }
)

# Run the executor with a potential for division by zero error
result = executor.run_with_fallback()
print(f"Result of the execution: {result}")
```