"""Create fallback_executor
Generated by Phi-Octopus Eden
2025-11-06 19:23:51.821281
"""

```python
from typing import Callable, Any


class FallbackExecutor:
    """
    A class that provides a mechanism for executing functions with fallbacks in case of errors.
    
    Args:
        primary_func: The primary function to be executed. Should accept variable arguments and keyword arguments.
        fallback_funcs: A list of fallback functions to be tried in case the primary function fails.
                        Each function should have the same signature as `primary_func`.
    """
    def __init__(self, primary_func: Callable[..., Any], fallback_funcs: list[Callable[..., Any]]):
        self.primary_func = primary_func
        self.fallback_funcs = fallback_funcs

    def execute(self, *args: Any, **kwargs: Any) -> Any:
        """
        Execute the primary function. If it raises an exception, attempt to use one of the fallback functions.
        
        Args:
            *args: Positional arguments for the functions.
            **kwargs: Keyword arguments for the functions.

        Returns:
            The result of the successfully executed function or None if all attempts fail.
        """
        try:
            return self.primary_func(*args, **kwargs)
        except Exception as e:
            print(f"Error executing primary function: {e}")
            fallback_index = 0
            while fallback_index < len(self.fallback_funcs):
                try:
                    return self.fallback_funcs[fallback_index](*args, **kwargs)
                except Exception as e:
                    print(f"Error executing fallback function {fallback_index}: {e}")
                    fallback_index += 1
            return None


# Example usage

def primary_func_example(x: int) -> int:
    """
    Primary function that may fail.
    
    Args:
        x: An integer input.
        
    Returns:
        The square of the input if successful, otherwise raises a ValueError.
    """
    if x < 0:
        raise ValueError("Input must be non-negative")
    return x ** 2


def fallback_func1_example(x: int) -> int:
    print("Executing fallback function 1.")
    return (x + 1) ** 2


def fallback_func2_example(x: int) -> int:
    print("Executing fallback function 2.")
    return (x - 1) ** 2


# Creating a FallbackExecutor instance
executor = FallbackExecutor(primary_func=primary_func_example, 
                            fallback_funcs=[fallback_func1_example, fallback_func2_example])

# Example calls
print(executor.execute(5))     # Should succeed and print 25
print(executor.execute(-3))    # Should raise ValueError and use a fallback function
```