"""Create fallback_executor
Generated by Phi-Octopus Eden
2025-11-08 07:50:26.293493
"""

```python
class FallbackExecutor:
    """
    A class to manage task execution with a fallback mechanism.
    
    Attributes:
        primary_executor (callable): The primary function to execute tasks.
        fallback_executor (callable): The secondary function to use if the primary fails.

    Methods:
        run_task(task: dict) -> str:
            Executes the given task using the primary executor. If it fails, attempts
            to execute the same task with the fallback executor.
    """
    
    def __init__(self, primary_executor: callable, fallback_executor: callable):
        self.primary_executor = primary_executor
        self.fallback_executor = fallback_executor

    def run_task(self, task: dict) -> str:
        """Execute a given task using either primary or fallback executor."""
        result = None
        try:
            result = self.primary_executor(task)
        except Exception as e:
            print(f"Primary execution failed with error: {e}")
            try:
                result = self.fallback_executor(task)
                print("Fallback executed successfully.")
            except Exception as fe:
                print(f"Fallback execution also failed with error: {fe}")
        
        return str(result)


# Example usage
def primary_addition_task(task):
    """Add two numbers provided in the task dictionary."""
    x, y = task.get('x'), task.get('y')
    if x is None or y is None:
        raise ValueError("Both 'x' and 'y' must be provided.")
    return x + y

def fallback_subtraction_task(task):
    """Subtract two numbers where possible in the task dictionary."""
    x, y = task.get('x'), task.get('y')
    if x is None or y is None:
        raise ValueError("Both 'x' and 'y' must be provided.")
    return x - y

# Creating a FallbackExecutor instance
executor = FallbackExecutor(primary_executor=primary_addition_task, 
                            fallback_executor=fallback_subtraction_task)

# Running tasks
task1 = {'x': 5, 'y': 3}
print(executor.run_task(task1))  # Output: 8

task2 = {'x': 5}  # Missing 'y' key
print(executor.run_task(task2))  # Output:
# Primary execution failed with error: Both 'x' and 'y' must be provided.
# Fallback executed successfully.
# 5
```