"""Create fallback_executor
Generated by Phi-Octopus Eden
2025-11-06 00:48:39.958122
"""

```python
class FallbackExecutor:
    """
    A class for creating a fallback mechanism to handle errors or failures in operations.

    Attributes:
        primary_exec (callable): The main function or method that is attempted first.
        fallback_exec (callable): The secondary function or method used as the fallback if the primary fails.
        error_types (tuple of Exception classes): Types of exceptions that should trigger a fallback execution.

    Methods:
        execute: Attempts to run the primary execution, and falls back to the secondary if an exception is raised.
    """

    def __init__(self, primary_exec: callable, fallback_exec: callable, error_types=(Exception,)):
        """
        Initialize FallbackExecutor with primary and fallback executors and optional exception types.

        Args:
            primary_exec (callable): The main function or method to attempt execution.
            fallback_exec (callable): The secondary function or method to use if the primary fails.
            error_types (tuple of Exception classes, optional): Types of exceptions to catch for fallback. Default is all.
        """
        self.primary_exec = primary_exec
        self.fallback_exec = fallback_exec
        self.error_types = error_types

    def execute(self, *args, **kwargs) -> any:
        """
        Attempt to run the primary execution and fall back to the secondary if an exception occurs.

        Args:
            *args: Positional arguments passed to both executors.
            **kwargs: Keyword arguments passed to both executors.

        Returns:
            The result of the primary or fallback execution, or None on failure without a fallback.
        """
        try:
            return self.primary_exec(*args, **kwargs)
        except self.error_types as e:
            if callable(self.fallback_exec):
                return self.fallback_exec(*args, **kwargs)
            else:
                print(f"No fallback function defined for error {e}")
                return None


# Example usage

def primary_func(x: int) -> int:
    """A simple primary function that may fail on non-integer inputs."""
    return x + 10


def fallback_func(x: int) -> int:
    """A simple fallback function with an alternative operation to the primary function."""
    return 2 * x


# Using FallbackExecutor
executor = FallbackExecutor(primary_exec=primary_func, fallback_exec=fallback_func)
result = executor.execute(5)  # Should succeed and return 15
print(result)

result = executor.execute('a')  # Should fail on primary but succeed on fallback with 'aa'
print(result)
```

This Python code defines a `FallbackExecutor` class that provides a generic way to handle errors by providing a fallback mechanism. The example usage demonstrates how to use the class in two scenarios: one where the primary function succeeds, and another where it fails, triggering the fallback.