"""Create fallback_executor
Generated by Phi-Octopus Eden
2025-11-08 01:36:35.601526
"""

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


class FallbackExecutor:
    """
    A class for executing a function with fallbacks in case of errors.
    
    Attributes:
        primary_fn (Callable): The primary function to execute.
        secondary_fn (Optional[Callable]): The fallback function if the primary fails.
        error_handler (Optional[Callable[[Exception], Any]]): A handler for custom error handling.
        
    Methods:
        run: Executes the primary function and handles errors using fallbacks and a custom error handler.
    """
    
    def __init__(self, primary_fn: Callable[..., Any], secondary_fn: Optional[Callable[..., Any]] = None,
                 error_handler: Optional[Callable[[Exception], Any]] = None):
        self.primary_fn = primary_fn
        self.secondary_fn = secondary_fn
        self.error_handler = error_handler
    
    def run(self) -> Any:
        """
        Executes the primary function, and if it fails, tries to execute the secondary function.
        
        Returns:
            The result of the executed function or None in case of unrecoverable failure.
            
        Raises:
            Any exception that is not handled by the fallbacks.
        """
        try:
            return self.primary_fn()
        except Exception as e:
            if self.secondary_fn:
                try:
                    return self.secondary_fn()
                except Exception as secondary_e:
                    if self.error_handler:
                        return self.error_handler(secondary_e)
                    else:
                        raise
            else:
                if self.error_handler:
                    return self.error_handler(e)
                else:
                    raise


# Example usage

def divide_numbers(a: int, b: int) -> float:
    """Divides two numbers."""
    return a / b

def handle_zero_division_error(error: Exception) -> str:
    """Returns an error message for division by zero."""
    return "Error: Division by zero is not allowed."

# Create FallbackExecutor instance
executor = FallbackExecutor(
    primary_fn=lambda: divide_numbers(10, 2),
    secondary_fn=lambda: divide_numbers(10, 5),
    error_handler=handle_zero_division_error
)

# Run the executor and print the result
try:
    result = executor.run()
    print(f"Result: {result}")
except Exception as e:
    print(f"Failed to execute the fallbacks with an error: {e}")
```