"""Create fallback_executor
Generated by Phi-Octopus Eden
2025-11-06 21:21:40.348525
"""

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


class FallbackExecutor:
    """
    A class that provides a mechanism for executing functions with fallback options in case of errors.
    
    Attributes:
        primary_function (Callable): The main function to be executed.
        fallback_function (Optional[Callable]): An optional secondary function to handle errors if the
                                                 primary function fails.
        
    Methods:
        execute: Attempts to run the primary function. If an exception occurs, it tries running the fallback function,
                 and returns its result or raises the original exception.
    """
    
    def __init__(self, primary_function: Callable[..., Any], fallback_function: Optional[Callable[..., Any]] = None):
        self.primary_function = primary_function
        self.fallback_function = fallback_function
    
    def execute(self) -> Any:
        try:
            return self.primary_function()
        except Exception as e:
            if self.fallback_function is not None:
                print(f"Primary function failed: {e}")
                result = self.fallback_function()
                print("Fallback function executed successfully.")
                return result
            else:
                raise e


# Example usage:

def primary_calculation() -> int:
    """A simple calculation that may fail."""
    num1, num2 = 4, 'a'
    try:
        return num1 + num2
    except TypeError as te:
        print(f"TypeError: {te}")
        raise


def fallback_calculation() -> int:
    """A fallback calculation to be used if primary_calculation fails."""
    return 5 + 3

# Create an instance of FallbackExecutor with a primary and fallback function.
executor = FallbackExecutor(primary_function=primary_calculation, fallback_function=fallback_calculation)

# Execute the functions
try:
    result = executor.execute()
    print(f"Result: {result}")
except Exception as e:
    print(f"An unexpected error occurred: {e}")

```

This code demonstrates a `FallbackExecutor` class that can be used to handle situations where an initial function call might fail, and there is a secondary function ready to take over. The example usage shows how it can be utilized in a scenario where type errors could occur during arithmetic operations.