"""Create fallback_executor
Generated by Phi-Octopus Eden
2025-11-06 13:21:41.473660
"""

```python
class FallbackExecutor:
    """
    A class for executing tasks that might fail and providing a fallback execution strategy.

    Attributes:
        primary_function (callable): The main function to execute.
        secondary_functions (list[callable]): List of functions to try if the primary fails.
        error_types (tuple[type, ...]): Tuple of error types to catch during execution.

    Methods:
        execute: Attempts to run the primary function and falls back to a secondary function on failure.
    """

    def __init__(self, primary_function, secondary_functions=(), error_types=(Exception,),):
        """
        Initialize FallbackExecutor with the primary function and optional fallbacks.

        Args:
            primary_function (callable): The main function to execute.
            secondary_functions (list[callable], optional): List of functions to try if the primary fails. Defaults to an empty list.
            error_types (tuple[type, ...], optional): Tuple of error types to catch during execution. Defaults to catching all exceptions.
        """
        self.primary_function = primary_function
        self.secondary_functions = secondary_functions
        self.error_types = error_types

    def execute(self, *args, **kwargs):
        """
        Execute the primary function and fall back to a secondary function on failure.

        Args:
            *args: Positional arguments passed to the functions.
            **kwargs: Keyword arguments passed to the functions.

        Returns:
            The result of the first successful execution or None if all fail.
        """
        try:
            return self.primary_function(*args, **kwargs)
        except self.error_types as e:
            for fallback in self.secondary_functions:
                try:
                    return fallback(*args, **kwargs)
                except self.error_types:
                    continue
            return None

# Example Usage
def primary_add(a: int, b: int) -> int:
    """Add two numbers."""
    return a + b

def secondary_subtract(a: int, b: int) -> int:
    """Subtract the second number from the first."""
    return a - b

def tertiary_multiply(a: int, b: int) -> int:
    """Multiply the two numbers."""
    return a * b

# Create an instance of FallbackExecutor
executor = FallbackExecutor(primary_add, secondary_functions=[secondary_subtract, tertiary_multiply], error_types=(ValueError, TypeError))

# Example calls with different outcomes
print(executor.execute(5, 3))  # Output: 8 (Primary success)
print(executor.execute(5, 'a'))  # Output: None (Primary and fallbacks fail due to type error)
```