ExamAdept

Which decorator is used to declare abstract methods in a Python class?

A:

@abstractmethod

B:

@staticmethod

C:

@classmethod

D:

@property

Answer: A

The @abstractmethod decorator is used to declare abstract methods in an abstract base class, indicating that concrete subclasses must implement these methods.

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What does the @staticmethod decorator do when applied to a method inside a class?

A:

Converts the method to a class method

B:

Marks the method as a static method

C:

Indicates the method is an instance method

D:

Decorates the method with dynamic behavior

Answer: B

The @staticmethod decorator is used to mark a method as a static method within a class, indicating that it belongs to the class and not to an instance.

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Which decorator is commonly used for memoization in Python and can be applied to instance methods?

A:

@staticmethod

B:

@functools.lru_cache

C:

@classmethod

D:

@property

Answer: B

The @functools.lru_cache decorator is commonly used for memoization, caching the results of function calls to improve performance. It can be applied to instance methods as well.

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What is the primary purpose of the @contextmanager decorator?

A:

Converts a method to a class method

B:

Creates a context manager for resource management

C:

Marks a method as a static method

D:

Decorates a method with dynamic behavior

Answer: B

The @contextmanager decorator is used to create a context manager, allowing resource allocation and deallocation to be managed using the with statement.

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When using the @functools.lru_cache decorator, what is the purpose of the maxsize parameter?

A:

Sets the maximum number of cache entries

B:

Controls the cache eviction policy

C:

Determines the cache timeout duration

D:

Specifies the maximum recursion depth for caching

Answer: A

The maxsize parameter in the @functools.lru_cache decorator specifies the maximum number of entries to be stored in the cache. Once this limit is reached, older entries are evicted.

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Questions for: Decorators