"""Create fallback_executor
Generated by Phi-Octopus Eden
2025-11-08 00:10:24.540710
"""

```python
class FallbackExecutor:
    """
    A class for executing functions with a fallback mechanism.

    This class is designed to handle situations where an initial function call might fail due to errors.
    If the primary function raises an exception, it attempts to use a fallback function instead.
    The fallback function can be specified separately from the primary function.

    Args:
        primary_function (callable): The main function to execute.
        fallback_function (callable): An optional alternative function to use if the primary fails.

    Raises:
        Exception: If both `primary_function` and `fallback_function` are None or if no suitable fallback is available.

    Returns:
        Any: The result of the executed function, either the primary or the fallback.
    """

    def __init__(self, primary_function: callable, fallback_function: callable = None):
        if primary_function is None and fallback_function is None:
            raise Exception("At least one function must be provided.")
        self.primary_function = primary_function
        self.fallback_function = fallback_function

    def execute_with_fallback(self) -> Any:
        try:
            return self.primary_function()
        except Exception as e:
            if not self.fallback_function:
                raise e
            return self.fallback_function()

# Example usage
def main_function():
    # Simulate a condition that might cause an error
    raise ValueError("Something went wrong in the primary function.")

def fallback_function():
    print("Using fallback function.")
    return "Fallback result"

executor = FallbackExecutor(primary_function=main_function, fallback_function=fallback_function)
result = executor.execute_with_fallback()
print(result)  # Expected output: Using fallback function.
                # Result: 'Fallback result'
```

```python
class AnotherPrimaryFunction:
    def __call__(self):
        return "Successful execution"

another_primary_function = AnotherPrimaryFunction()

# Example usage with a different primary function
executor_with_alternative = FallbackExecutor(primary_function=another_primary_function)
result = executor_with_alternative.execute_with_fallback()
print(result)  # Expected output: 'Successful execution'
```