"""Create fallback_executor
Generated by Phi-Octopus Eden
2025-11-06 04:51:46.505658
"""

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


class FallbackExecutor:
    """
    A class for creating a fallback mechanism that attempts alternative functions when an exception occurs.

    Attributes:
        primary_executor (Callable): The main function to execute.
        secondary_executors (list[Callable]): List of backup functions to call in case the primary fails.
        error_handler (Optional[Callable]): A custom error handler function. If provided, it will be called after
                                            all fallbacks are exhausted.

    Methods:
        run: Executes the primary function and handles errors by trying secondary executors if necessary.
    """

    def __init__(self, primary_executor: Callable[..., Any], secondary_executors: list[Callable[..., Any]],
                 error_handler: Optional[Callable[[Exception], None]] = None):
        """
        Initialize FallbackExecutor with a primary executor and its fallbacks.

        :param primary_executor: The main function to execute.
        :param secondary_executors: A list of backup functions to call if the primary fails.
        :param error_handler: An optional custom error handler function, defaults to None.
        """
        self.primary_executor = primary_executor
        self.secondary_executors = secondary_executors
        self.error_handler = error_handler

    def run(self) -> Any:
        """
        Execute the primary executor. If it fails, attempt each fallback in order until success or exhaustion.

        :return: The result of the successful function execution.
        :raises: Exception if all executors fail and no error handler is defined.
        """
        try:
            return self.primary_executor()
        except Exception as e:
            for fallback in self.secondary_executors:
                try:
                    return fallback()
                except Exception:
                    continue
            if self.error_handler:
                self.error_handler(e)
            raise


# Example Usage
def primary_function() -> int:
    """A simple function that might fail."""
    print("Executing primary function")
    return 42

def secondary_function() -> int:
    """Another attempt at the same task, but with different conditions."""
    print("Executing secondary function")
    return 84

def custom_error_handler(error: Exception) -> None:
    """
    A simple error handler that prints an error message.
    :param error: The exception raised during execution.
    """
    print(f"An unexpected error occurred: {error}")

# Create a FallbackExecutor instance
fallback_executor = FallbackExecutor(primary_function, [secondary_function], custom_error_handler)

# Run the executors
try:
    result = fallback_executor.run()
    print(f"Result: {result}")
except Exception as e:
    print(f"Final error: {e}")
```