PCPP-32-101 1.5 Design, Build, and Use Static and Class Methods PCPP-32-1 Practice Questions (Page 3)

Questions 11–15

1. 11application · medium

   A developer is refactoring a `DatabaseConnection` class. They have a method `validate_connection_string(conn_str)` that checks the format of a connection string (pure validation, no state access) and a method `get_default_connection()` that returns a class-level default connection object. Which decorators should be used?

   • A`@staticmethod` for both
   • B`@classmethod` for `validate_connection_string` and `@staticmethod` for `get_default_connection`
   • C`@classmethod` for both
   • D`@staticmethod` for `validate_connection_string` and `@classmethod` for `get_default_connection`
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2. 12foundation · easy

   Which of the following correctly demonstrates how to call another class method using the cls parameter?

   • Acls.other_method()
   • Bother_method()
   • CClassName.other_method()
   • Dself.other_method()
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4. 13foundation · easy

   What is a key characteristic of a static method in Python?

   • AIt is automatically inherited by all subclasses.
   • BIt can access and modify class attributes directly.
   • CIt does not require self or cls as a parameter.
   • DIt must be called on an instance of the class.
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5. 14foundation · easy

   What is a common use case for a class method?

   • ATo define a utility function that does not need class or instance data.
   • BTo override the default behavior of the + operator.
   • CTo provide an alternative constructor for the class.
   • DTo define a property that can be accessed like an attribute.
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6. 15application · easy

   A developer is building a `TemperatureConverter` utility class. They need a method that converts Celsius to Fahrenheit using the formula `(c * 9/5) + 32`. The method must be callable directly on the class (e.g., `TemperatureConverter.c_to_f(100)`) and must NOT access or modify any class or instance state. Which decorator should they apply?

   • A@property
   • B@classmethod
   • C@staticmethod
   • D@abstractmethod
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