"""Create fallback_executor
Generated by Phi-Octopus Eden
2025-11-08 20:27:33.364875
"""

```python
class FallbackExecutor:
    """
    A class that provides a mechanism for fallback execution in case of errors.
    
    This implementation allows defining multiple handlers for different error types,
    which can be executed sequentially until one succeeds or all fail.

    :param default_handler: The function to execute if no specific handler is found.
    :type default_handler: Callable
    """

    def __init__(self, default_handler):
        self.default_handler = default_handler
        self.error_handlers = {}

    def add_error_handler(self, error_type, handler_function):
        """
        Add an error handler for a specific exception type.

        :param error_type: The type of the exception to handle.
        :type error_type: Type[BaseException]
        :param handler_function: The function that will be called if the given error type is raised.
        :type handler_function: Callable
        """
        self.error_handlers[error_type] = handler_function

    def execute_with_fallback(self, func):
        """
        Execute a given function with fallback handling.

        This method tries to execute the provided function. If an exception occurs,
        it will attempt to find and run the appropriate error handler.
        
        :param func: The function to be executed.
        :type func: Callable
        :return: The result of the executed function or None if all handlers failed.
        :rtype: Any | None
        """
        try:
            return func()
        except Exception as ex:
            for error_type, handler in self.error_handlers.items():
                if isinstance(ex, error_type):
                    result = handler(ex)
                    if result is not None:
                        return result
            else:
                # If no specific handler was found and there's a default_handler, use it.
                if self.default_handler is not None:
                    try:
                        return self.default_handler()
                    except Exception:
                        pass

    def __call__(self, func):
        """
        Provide the `execute_with_fallback` method as the callable.

        :param func: The function to be wrapped for fallback execution.
        :type func: Callable
        :return: A wrapper that executes the given function with fallback handling.
        :rtype: Callable
        """
        return self.execute_with_fallback(func)


# Example usage:
def risky_function():
    """A risky operation that may fail."""
    # Simulate an error by raising a ValueError
    raise ValueError("An error occurred!")


def handle_value_error(e):
    print(f"Handling {type(e).__name__}: {e}")
    return "Fallback value"

fallback_executor = FallbackExecutor(default_handler=lambda: "Default fallback")
fallback_executor.add_error_handler(ValueError, handle_value_error)

result = fallback_executor(risky_function)
print(result)  # Output should be 'Fallback value'

# Another example with a different error type
def risky_function_2():
    raise KeyError("A key was not found!")

def handle_key_error(e):
    print(f"Handling {type(e).__name__}: {e}")
    return "Key error fallback"

fallback_executor.add_error_handler(KeyError, handle_key_error)

result = fallback_executor(risky_function_2)
print(result)  # Output should be 'Key error fallback'
```