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A custom exception class that signals when an operation cannot be performed on a virtual item.

Purpose

VirtualItemError is a specialized exception class that inherits from Python's built-in Exception class. It is designed to be raised when code attempts to perform an operation that is not permitted on virtual items. This provides a specific, semantic way to handle errors related to virtual item operations, allowing calling code to catch and handle this specific error type separately from other exceptions. Virtual items are likely placeholder or abstract representations that don't support certain concrete operations.

Source Code

class VirtualItemError(Exception):
    """An operation can not be done on a virtual item."""
    pass

Parameters

Parameter Details

*args: Variable positional arguments passed to the Exception base class constructor. Typically includes an error message string describing what operation failed and why.

**kwargs: Variable keyword arguments passed to the Exception base class constructor. Rarely used but available for advanced exception handling scenarios.

Return Value

Instantiation returns a VirtualItemError exception object that can be raised using the 'raise' statement. When caught, the exception object contains the message and traceback information inherited from the Exception base class. The exception object itself has standard exception attributes like 'args' (tuple of arguments passed during instantiation) and can be converted to a string to display the error message.

Class Interface

Attributes

Usage Example

# Raising the exception
def process_item(item):
    if item.is_virtual:
        raise VirtualItemError(f"Cannot process virtual item: {item.name}")
    # Process the item normally
    return item.process()

# Catching the exception
try:
    result = process_item(my_item)
except VirtualItemError as e:
    print(f"Virtual item error occurred: {e}")
    # Handle the virtual item case specifically
    result = None
except Exception as e:
    print(f"Other error occurred: {e}")
    raise

Best Practices

• Raise this exception when detecting that an item is virtual and the requested operation is not supported on virtual items
• Always include a descriptive error message when raising the exception to help with debugging
• Catch this specific exception type when you want to handle virtual item errors differently from other exceptions
• Use this exception in a consistent manner across your codebase to maintain clear error semantics
• Consider documenting in your code which operations raise VirtualItemError so users of your API know what to expect
• This exception should be raised early in validation logic before attempting operations that would fail on virtual items

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