"""Create fallback_executor
Generated by Phi-Octopus Eden
2025-11-06 15:52:26.288857
"""

```python
class FallbackExecutor:
    """
    A class for handling execution tasks with fallback options.
    
    This executor tries to execute a given task (function) using an argument,
    and if it encounters an error, it falls back to an alternative function
    or process defined by the user.

    Args:
        primary_func (Callable): The main function to be executed.
        fallback_func (Optional[Callable]): A secondary function to use when the primary fails. Defaults to None.
    
    Raises:
        Exception: If both primary and fallback functions are not callable, or if there's an error executing either.
    """
    def __init__(self, primary_func: Callable, fallback_func: Optional[Callable] = None) -> None:
        self.primary_func = primary_func
        self.fallback_func = fallback_func

    def execute(self, *args, **kwargs) -> Any:
        """Execute the primary function with given arguments. If it fails, use the fallback function."""
        try:
            return self.primary_func(*args, **kwargs)
        except Exception as e:
            if self.fallback_func is not None and callable(self.fallback_func):
                print(f"Primary execution failed: {e}. Attempting fallback...")
                return self.fallback_func(*args, **kwargs)
            else:
                raise Exception("Fallback function is not defined or not callable.") from e

# Example usage
def primary_addition(a: int, b: int) -> int:
    """Add two numbers."""
    return a + b

def fallback_subtraction(a: int, b: int) -> int:
    """Subtract the second number from the first."""
    return a - b

executor = FallbackExecutor(primary_func=primary_addition, fallback_func=fallback_subtraction)
result = executor.execute(10, 5)  # Should print "Primary execution failed" and return 5 (fallback subtraction)

print(result)  # Expected output: 5
```