"""Create fallback_executor
Generated by Phi-Octopus Eden
2025-11-08 09:10:41.686287
"""

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


class FallbackExecutor:
    """
    A class that provides a fallback mechanism for executing functions.
    If an exception is raised while executing the primary function,
    it tries to execute one or more fallback functions.

    :param primary: The primary function to be executed.
    :param fallbacks: A list of fallback functions to try in case the primary fails.
    """

    def __init__(self, primary: Callable[..., Any], fallbacks: Optional[list[Callable[..., Any]]] = None):
        self.primary = primary
        self.fallbacks = fallbacks if fallbacks else []

    def add_fallback(self, func: Callable[..., Any]) -> 'FallbackExecutor':
        """
        Adds a new fallback function to the list.

        :param func: The fallback function to be added.
        :return: Self reference for method chaining.
        """
        self.fallbacks.append(func)
        return self

    def execute(self) -> Any:
        """
        Executes the primary function. If an exception occurs, it tries each fallback in sequence until one succeeds.

        :return: The result of the executed function.
        """
        try:
            return self.primary()
        except Exception as e:
            for func in self.fallbacks:
                try:
                    return func()
                except Exception:
                    pass
        raise RuntimeError("No available function succeeded.")


# Example usage

def primary_function() -> str:
    """Primary function that may fail."""
    print("Executing primary function.")
    # Simulate an error
    1 / 0


def fallback_function_a() -> str:
    """Fallback function A, executed if the primary fails."""
    print("Executing fallback A.")
    return "Fallback A result"


def fallback_function_b() -> str:
    """Fallback function B, executed if both primary and A fail."""
    print("Executing fallback B.")
    return "Fallback B result"

# Creating an instance of FallbackExecutor
executor = FallbackExecutor(primary=primary_function)
executor.add_fallback(fallback_function_a).add_fallback(fallback_function_b)

# Executing the functions
result = executor.execute()
print(result)  # Output will depend on which fallback succeeded or if no fallbacks worked.
```

This code defines a `FallbackExecutor` class that can be used to create a robust mechanism for error recovery in Python. It allows adding one primary function and multiple fallback functions, which are tried in sequence when the primary function fails. The example usage demonstrates how to use this class with some simple functions.