Exercise: Classes

Questions for: Classes

What is the primary purpose of the __doc__ attribute?
A:
It stores the documentation string for a module, class, or function.
B:
It is used to access the private documentation of a class.
C:
It indicates the default values of the class attributes.
D:
It defines the documentation for a class constructor.
Answer: A
The __doc__ attribute in Python is used to access the documentation string (docstring) associated with a module, class, or function. It provides information about the purpose and usage of the code.
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What is the purpose of the isinstance() function?
A:
It checks if a variable is an instance of a specified class.
B:
It determines if an object has a particular attribute.
C:
It checks if two objects are of the same type.
D:
It verifies if an object is iterable.
Answer: A
The isinstance() function is used to check if a variable is an instance of a specified class or a tuple of classes. It returns True if the object is an instance of any of the given classes.
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What is the purpose of the @abstractmethod decorator?
A:
It creates an abstract class in Python.
B:
It indicates a method that must be implemented by any concrete (non-abstract) subclass.
C:
It is used to define a method that cannot be overridden.
D:
It marks a method as private and inaccessible from outside the class.
Answer: B
The @abstractmethod decorator is used to define abstract methods in an abstract class. Any concrete subclass must implement these abstract methods.
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In Python, what is the purpose of the __slots__ attribute in a class?
A:
It specifies the names of class methods.
B:
It defines the list of attributes that instances of the class can have.
C:
It indicates the inheritance hierarchy of the class.
D:
It is used to declare static variables in a class.
Answer: B
The __slots__ attribute in a class is used to explicitly declare a list of allowed attributes for instances of the class. It can help in saving memory by preventing the creation of additional instance attributes.
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What is the purpose of the @property decorator?
A:
It defines a property of a class that can be accessed using dot notation.
B:
It marks a method as a getter for a class attribute.
C:
It is used to create an instance variable in a class.
D:
It indicates a method that can only be accessed by the class itself.
Answer: B
The @property decorator is used to define a getter method for a class attribute. It allows the method to be accessed like an attribute without using parentheses.
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