PCAP Object-Oriented Programming Practice Question
A programmer writes a class with a method that should be called on the class itself, not on instances. Which decorator is appropriate?
⚠ Common exam trap
Python Institute often tests the distinction between @classmethod and @staticmethod, trapping candidates who think both are interchangeable for class-level calls, but @staticmethod does not receive the class argument and cannot modify class state.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
@classmethod
The @classmethod decorator transforms a method so that it receives the class itself as the first implicit argument (cls), rather than an instance (self). This allows the method to be called on the class directly, e.g., MyClass.my_method(), and is the correct choice when a method should operate on the class level, not on instances.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
@property
Why it's wrong here
The @property decorator is designed to make a method behave like a computed instance attribute, such as obj.value. It relies on an instance (self) and is only meaningful when accessed through an object; accessing it on the class itself (ClassName.method) returns the raw property object rather than a callable. Because the stem requires a method callable directly on the class, not on instances, @property cannot satisfy the requirement.
- ✓
@classmethod
Why this is correct
The `@classmethod` decorator binds the method to the class rather than to an instance, automatically receiving the class (`cls`) as the first parameter instead of `self`. This satisfies the stem’s constraint that the method “should be called on the class itself, not on instances,” because the decorator ensures the method can be invoked directly via `ClassName.method()` without requiring an object.
- ✗
@abstractmethod
Why it's wrong here
The @abstractmethod decorator declares a method signature that subclasses must override, but it does not alter how the method is invoked. The method still takes self and is intended to be called on an instance of a subclass, not on the class object directly. Moreover, a class with any abstract methods cannot be instantiated without overriding them, so this decorator is about enforcing an inheritance contract rather than providing a class-level callable.
- ✗
@staticmethod
Why it's wrong here
The @staticmethod decorator creates a plain function attached to a class, but unlike @classmethod it receives neither self nor cls as an automatic first argument. It can be invoked on the class, but it has no access to class-level state or other class methods, making it essentially an organizational utility rather than a class-level method in the semantic sense. The stem's phrase 'called on the class itself' implies the method should operate with knowledge of the class, which @staticmethod explicitly avoids.
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