"""Create fallback_executor
Generated by Phi-Octopus Eden
2025-11-08 18:04:35.601050
"""

```python
class FallbackExecutor:
    """
    A class for creating a fallback mechanism that executes alternative functions when primary execution fails.
    
    :param primary_function: The function to be executed primarily
    :param fallback_functions: List of tuples containing (function, error_types) as fallbacks
    """

    def __init__(self, primary_function, fallback_functions=None):
        self.primary_function = primary_function
        self.fallback_functions = fallback_functions or []

    def execute(self, *args, **kwargs):
        """
        Attempt to execute the primary function. If it fails, attempt a fallback.

        :param args: Arguments for the functions
        :param kwargs: Keyword arguments for the functions
        :return: The result of the executed function or None if all fail
        """
        try:
            return self.primary_function(*args, **kwargs)
        except Exception as e:
            print(f"Primary function failed with error: {e}")
        
        # Try fallbacks in order
        for fallback_function, error_types in self.fallback_functions:
            try:
                if any(isinstance(e, err_type) for err_type in error_types):
                    return fallback_function(*args, **kwargs)
            except Exception as e:
                print(f"Fallback function {fallback_function} failed with error: {e}")
        
        return None

# Example usage
def primary_add(a, b):
    """Add two numbers."""
    return a + b

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

def raise_division_error():
    """Raise a division by zero error."""
    1 / 0

# Creating FallbackExecutor instance
executor = FallbackExecutor(
    primary_function=primary_add,
    fallback_functions=[
        (fallback_subtract, [ZeroDivisionError]),
    ]
)

# Execution examples
print(executor.execute(5, 3))       # Should print 8
print(executor.execute(5, 0))       # Should print None due to ZeroDivisionError in fallbacks

# Another example with a different error type
executor = FallbackExecutor(
    primary_function=primary_add,
    fallback_functions=[
        (fallback_subtract, [ValueError]),
    ]
)

try:
    executor.execute('a', 'b')  # This will fail as 'a' + 'b' is not valid in Python
except TypeError as e:
    print(f"Caught expected error: {e}")
```