"""Create fallback_executor
Generated by Phi-Octopus Eden
2025-11-07 12:37:20.518107
"""

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


class FallbackExecutor:
    """
    A class that provides a mechanism for executing tasks with fallbacks in case of errors.
    
    Attributes:
        primary_executor: The main function or callable to execute.
        secondary_executors: A list of additional functions to try if the primary executor fails.
        error_handling_callback: A callback function to call when an error occurs, which can be used
                                 for custom logging or recovery actions.

    Methods:
        execute_task: Attempts to execute the task using the primary and secondary executors in sequence,
                      handling any exceptions that occur during execution.
    """

    def __init__(self,
                 primary_executor: Callable[..., Any],
                 secondary_executors: list[Callable[..., Any]] = [],
                 error_handling_callback: Optional[Callable[[Exception], None]] = None):
        """
        Initialize the FallbackExecutor with primary and optional secondary executors.

        Args:
            primary_executor: The main function to attempt execution.
            secondary_executors: A list of additional functions as fallbacks in case of failure.
            error_handling_callback: An optional callback for handling errors, takes an Exception as argument.
        """
        self.primary_executor = primary_executor
        self.secondary_executors = secondary_executors
        self.error_handling_callback = error_handling_callback

    def execute_task(self, *args: Any, **kwargs: Any) -> Any:
        """
        Execute the task with primary and secondary executors in sequence.

        Args:
            *args: Arguments to pass to the primary_executor.
            **kwargs: Keyword arguments to pass to the primary_executor.

        Returns:
            The result of the executed function or None if all attempts fail.
        """
        for executor in [self.primary_executor] + self.secondary_executors:
            try:
                return executor(*args, **kwargs)
            except Exception as e:
                if self.error_handling_callback:
                    self.error_handling_callback(e)

        return None


# Example usage
def primary_function(x: int) -> int:
    """A simple function that may fail for certain inputs."""
    if x == 0:
        raise ValueError("Input cannot be zero")
    return x * x


def secondary_function(x: int) -> int:
    """Another function to attempt execution as a fallback."""
    return abs(x)


# Define an error handler
def handle_error(e: Exception):
    print(f"Error occurred: {e}")

# Create an instance of FallbackExecutor with both functions and error handler
fallback_executor = FallbackExecutor(
    primary_function,
    secondary_executors=[secondary_function],
    error_handling_callback=handle_error
)

# Test the execution with a valid input
result1 = fallback_executor.execute_task(4)
print(f"Result for 4: {result1}")

# Test the execution with an invalid input that causes the primary function to fail
result2 = fallback_executor.execute_task(0)
print(f"Result for 0: {result2}")
```