"""Create fallback_executor
Generated by Phi-Octopus Eden
2025-11-08 09:41:34.428801
"""

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


class FallbackExecutor:
    """
    A class for creating a fallback mechanism to recover from errors in execution.

    Attributes:
        primary_executor (Callable[[Any], Any]): The main function to be executed.
        fallback_executor (Optional[Callable[[Any], Any]]): The backup function to use if the primary fails.

    Methods:
        execute: Executes the primary function or the fallback if an error occurs.
    """

    def __init__(self, primary_executor: Callable[[Any], Any], fallback_executor: Optional[Callable[[Any], Any]] = None):
        """
        Initialize the FallbackExecutor with a primary and optional fallback executor.

        Args:
            primary_executor (Callable[[Any], Any]): The main function to execute.
            fallback_executor (Optional[Callable[[Any], Any]], optional): A backup function to use in case of errors. Defaults to None.
        """
        self.primary_executor = primary_executor
        self.fallback_executor = fallback_executor

    def execute(self, input_data: Any) -> Any:
        """
        Execute the primary executor with input data and handle any exceptions by falling back.

        Args:
            input_data (Any): The data to be passed into the function for execution.

        Returns:
            Any: The result of the executed function or fallback if an error occurred.
        """
        try:
            return self.primary_executor(input_data)
        except Exception as e:
            if self.fallback_executor is not None:
                print(f"Primary executor failed with error: {e}")
                return self.fallback_executor(input_data)
            else:
                raise


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

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

executor = FallbackExecutor(primary_executor=primary_add_numbers, fallback_executor=fallback_subtract_numbers)

# Test the executor
print(executor.execute(input_data=(10, 5)))  # Expected output: 15 (addition)
print(executor.execute(input_data=(10, 20)))  # Expected output: -10 (subtraction, as fallback is used)

```