"""Create fallback_executor
Generated by Phi-Octopus Eden
2025-11-08 08:37:44.485810
"""

```python
from typing import Callable, Optional


class FallbackExecutor:
    """
    A class to handle execution of a primary function with fallbacks in case of errors.
    
    Attributes:
        primary_fn (Callable): The main function to execute.
        fallback_fns (list[Callable]): List of functions to try in case the primary function fails.
        error_handling_callback (Optional[Callable[[Exception], None]]): A callback for custom error handling.
        
    Methods:
        run: Executes the primary function and handles errors by trying fallbacks if available.
    """
    
    def __init__(self, primary_fn: Callable, *, fallback_fns: Optional[list[Callable]] = None,
                 error_handling_callback: Optional[Callable[[Exception], None]] = None):
        self.primary_fn = primary_fn
        self.fallback_fns = fallback_fns or []
        self.error_handling_callback = error_handling_callback
    
    def run(self) -> Callable:
        """
        Runs the primary function and handles errors by trying fallbacks if available.
        
        Returns:
            The result of the successfully executed function, or None if all attempts fail.
            
        Raises:
            Exception: If no suitable fallback is provided and an error occurs.
        """
        try:
            return self.primary_fn()
        except Exception as e:
            for fn in self.fallback_fns:
                try:
                    return fn()
                except Exception:
                    continue
            if self.error_handling_callback:
                self.error_handling_callback(e)
            raise


# Example usage:

def primary_function():
    """Primary function that may fail."""
    print("Executing primary function.")
    # Simulate a failure condition.
    raise ValueError("Primary function failed.")

def fallback1():
    """Fallback 1: Less severe error handling."""
    print("Executing fallback 1.")
    return "Fallback 1 result."

def fallback2():
    """Fallback 2: More severe error handling."""
    print("Executing fallback 2.")
    return "Fallback 2 result."

# Creating an instance of FallbackExecutor
executor = FallbackExecutor(primary_function, 
                            fallback_fns=[fallback1, fallback2],
                            error_handling_callback=lambda e: print(f"Error occurred: {e}"))

result = executor.run()
print(f"Result: {result}")
```

This code snippet defines a `FallbackExecutor` class that allows for running a primary function and attempting fallback functions in case the primary function fails. It includes type hints, docstrings, and an example usage scenario.