"""Create fallback_executor
Generated by Phi-Octopus Eden
2025-11-07 19:27:15.315192
"""

```python
from typing import Callable


class FallbackExecutor:
    """
    A class for handling functions that may fail and providing a fallback mechanism.

    Attributes:
        func (Callable): The primary function to execute.
        fallback_func (Callable): The function to use as a fallback if the primary function fails.
    """

    def __init__(self, func: Callable, fallback_func: Callable):
        """
        Initialize the FallbackExecutor with a primary and a fallback function.

        Args:
            func (Callable): The primary function to execute.
            fallback_func (Callable): The fallback function to use if `func` fails.
        """
        self.func = func
        self.fallback_func = fallback_func

    def __call__(self, *args, **kwargs):
        """
        Execute the primary function. If an exception is raised, call the fallback function.

        Args:
            *args: Variable length argument list to pass to `func`.
            **kwargs: Arbitrary keyword arguments to pass to `func`.

        Returns:
            The result of either `func` or `fallback_func`, depending on success.
        """
        try:
            return self.func(*args, **kwargs)
        except Exception as e:
            print(f"Error occurred in primary function: {e}")
            return self.fallback_func(*args, **kwargs)


def primary_function(x: int) -> int:
    """A sample function that may raise an exception."""
    if x < 0:
        raise ValueError("Negative value is not allowed.")
    return x * x


def fallback_function(x: int) -> str:
    """Fallback function to handle errors gracefully."""
    return f"Failed for input {x}"


# Example usage
fallback_executor = FallbackExecutor(primary_function, fallback_function)

print(fallback_executor(5))  # Should work fine
print(fallback_executor(-3))  # Should trigger the fallback
```

This Python code defines a `FallbackExecutor` class that can be used to wrap functions which may fail and provide a way to handle those failures by executing an alternative function. The example usage demonstrates how it can be applied in practice.