Questions and Answers
What is the general class in the relationship between superclasses and subclasses?
superclass
What is the specialized class in the relationship between superclasses and subclasses?
subclass
What does it mean to say there is an 'is a' relationship between two objects?
When one object is a specialized version of another object.
What does a subclass inherit from its superclass?
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What is the name of the superclass in the class definition 'class Canary(Bird):'?
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______ allows a new class to extend an existing class.
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In an inheritance relationship, which is the general class?
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In an inheritance relationship, which is the specialized class?
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Which of these would most likely be the subclass in the relationship between Airplane and JumboJet?
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What characteristic of object-oriented programming allows the correct version of an overridden method to be called?
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Which function can be used to determine whether an object is an instance of a class?
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Polymorphism allows you to write methods in a subclass that have the same name as methods in the superclass.
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It is not possible to call a superclass's init method from a subclass's init method.
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A subclass can have a method with the same name as a method in the superclass.
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Only the init method can be overridden.
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You cannot use the isinstance function to determine whether an object is an instance of a subclass of a class.
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What is the name of the superclass in the class definition 'class Tiger(Felis):'?
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What is an overridden method?
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In object-oriented programming, ______ is used to create an 'is a' relationship among classes.
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Superclasses are also called ______.
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Subclasses are also called ______.
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Inheritance involves a superclass and a subclass. The superclass is the ______ and the subclass is the ______.
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You show inheritance in a UML diagram by ______ from the subclass to the superclass.
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What functionality does polymorphism provide?
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We can prevent an AttributeError exception from occurring by using the built-in function ______.
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Study Notes
Inheritance and Object-Oriented Programming
- Superclass is a general class; subclass is a specialized class.
- An "is a" relationship indicates that one object is a specific version of another, meaning the specialized object possesses all attributes of the general object, plus extra features.
- Subclasses inherit all attributes from their superclasses.
Class Definition and Relationships
- In the class definition
class Canary(Bird):, Bird is the superclass while Canary is the subclass. - Inheritance allows new classes to extend existing ones by inheriting members.
Identifying Classes
- The superclass is the general class in an inheritance relationship.
- The subclass is the specialized class in an inheritance relationship.
- In the scenario with Airplane and JumboJet, JumboJet would most likely be the subclass of Airplane.
Polymorphism
- Polymorphism permits the correct overridden method to be executed when a subclass instance invokes it.
- Methods in a subclass can share the same name as methods in the superclass, enhancing functionality and flexibility.
Instance Checks
- The
isinstancefunction checks if an object is an instance of a specified class or subclass. - It is false to say you cannot call a superclass's
__init__method from a subclass's__init__method.
Overriding Methods
- A method in a subclass can have the same name as one in the superclass, creating an overridden method.
- Not only the
__init__method can be overridden; any method can be.
General Knowledge
- Superclasses are referred to as base classes; subclasses are often called derived classes.
- Inheritance is illustrated in UML diagrams with a line that has an open arrowhead pointing from the subclass to the superclass.
- Polymorphism allows for method name overlap between subclasses and superclasses, enabling correct method calls based on the object type.
- Using
isinstancehelps prevent AttributeError by confirming if an object belongs to a specific class or its subclass.
Studying That Suits You
Use AI to generate personalized quizzes and flashcards to suit your learning preferences.
Description
Test your knowledge of classes in Python with these flashcards from Chapter 11 of 'Starting Out with Python'. Focus on understanding superclasses and subclasses, as well as the 'is a' relationship in object-oriented programming. Perfect for reinforcing key concepts in this chapter.
