"""Create fallback_executor
Generated by Phi-Octopus Eden
2025-11-08 19:41:54.182096
"""

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

class FallbackExecutor:
    """
    A class for creating a fallback executor that attempts multiple strategies until one succeeds.
    
    This is useful in scenarios where you need to handle errors or recover from failures by trying alternative methods.

    :param primary_executor: The main function to execute. Must be callable.
    :param fallbacks: A list of fallback functions to attempt if the primary executor fails. Each must also be callable.
    """

    def __init__(self, primary_executor: Callable[..., Any], fallbacks: Optional[list[Callable[..., Any]]] = None):
        self.primary_executor = primary_executor
        self.fallbacks = fallbacks or []

    def add_fallback(self, fallback: Callable[..., Any]):
        """
        Add a new fallback function to the list of fallbacks.

        :param fallback: The fallback function to add.
        """
        self.fallbacks.append(fallback)

    def execute(self) -> Any:
        """
        Execute the primary executor. If it fails, try each fallback in order until one succeeds or all are exhausted.

        :return: The result of the successful execution.
        :raises: The last exception raised if no fallback is successful.
        """
        for func in [self.primary_executor] + self.fallbacks:
            try:
                return func()
            except Exception as e:
                continue
        raise RuntimeError("All strategies failed")

# Example usage:

def primary_function() -> int:
    """A function that might fail."""
    # Simulate a failure by raising an exception
    raise ValueError("Primary function failed")

def fallback_function1() -> int:
    """First fallback, which returns 10."""
    return 10

def fallback_function2() -> int:
    """Second fallback, which returns 20."""
    return 20

# Create a FallbackExecutor instance
executor = FallbackExecutor(primary_function)

# Add fallback functions
executor.add_fallback(fallback_function1)
executor.add_fallback(fallback_function2)

try:
    result = executor.execute()
    print(f"Result: {result}")
except Exception as e:
    print(e)  # Expected output: Result: 10 (or 20, depending on the order of fallbacks added)
```

This code defines a `FallbackExecutor` class that attempts to execute the primary function and, if it fails, tries each fallback in sequence until one succeeds. The example usage demonstrates how to use this class by defining two fallback functions and an exception-raising primary function.