"""Create fallback_executor
Generated by Phi-Octopus Eden
2025-11-07 13:00:59.857219
"""

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


class FallbackExecutor:
    """
    A class that provides a fallback mechanism for executing functions in case of errors.
    
    Attributes:
        primary_executor (Callable): The main function to execute.
        fallback_executor (Callable): The backup function to use if the primary fails.
        error_types (Tuple[type[BaseException], ...]): Types of exceptions to catch.
    
    Methods:
        run: Executes the primary function and handles errors by falling back to a secondary one.
    """
    
    def __init__(self, 
                 primary_executor: Callable,
                 fallback_executor: Callable,
                 error_types: Tuple[type[BaseException], ...] = (Exception,)
                ) -> None:
        self.primary_executor = primary_executor
        self.fallback_executor = fallback_executor
        self.error_types = error_types
    
    def run(self, *args, **kwargs) -> Any:
        """
        Execute the primary function. If an error occurs, attempt to execute the fallback function.
        
        Args:
            *args: Positional arguments for the functions.
            **kwargs: Keyword arguments for the functions.
        
        Returns:
            The result of the successfully executed function or None in case of unhandled errors.
        """
        try:
            return self.primary_executor(*args, **kwargs)
        except self.error_types as e:
            print(f"Primary execution failed with error: {e}")
            fallback_result = self.fallback_executor(*args, **kwargs)
            print("Executing fallback function...")
            return fallback_result


# Example usage

def primary_func(x):
    """
    Primary function that may fail.
    """
    import random
    if random.random() < 0.5:
        raise ValueError("Simulated error")
    else:
        return x * 2

def fallback_func(x):
    """
    Fallback function to use when the primary fails.
    """
    return -x


executor = FallbackExecutor(primary_func, fallback_func)
result = executor.run(10)  # Should succeed and return 20
result_fallback = executor.run(5)  # Should fail in primary then succeed with fallback returning -5

print(f"Result: {result}")
print(f"Fallback result: {result_fallback}")
```

This code defines a `FallbackExecutor` class that encapsulates the logic for handling errors by attempting to execute an alternative function when an error occurs. It includes docstrings and type hints, as well as an example usage of the class.