Python Chapter 9 Flashcards
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Questions and Answers

What is an instance variable?

is owned by a particular instance of a class and no other

What is a polymorphic method?

has a single header but different bodies in different classes

What is a class variable used for?

data that all instances of a class have in common

How is class A's init method called in class B?

<p>A.<strong>init</strong>(self)</p> Signup and view all the answers

When does an object's lifetime end?

<p>when it can no longer be referenced anywhere in a program</p> Signup and view all the answers

What is the name used to refer to the current instance of a class?

<p>self</p> Signup and view all the answers

What is the purpose of the init method in a class?

<p>to set the instance variable to initial values</p> Signup and view all the answers

A method definition must have at least one parameter name, called self.

<p>True</p> Signup and view all the answers

What is the easiest way to save objects to permanent storage?

<p>pickle them using the pickle function dump</p> Signup and view all the answers

What is the scope of an instance variable?

<p>the entire class in which it is introduced</p> Signup and view all the answers

What does a simple class consist of?

<p>a header and a sets of method definitions</p> Signup and view all the answers

In addition to methods, what does a class include?

<p>instance variables</p> Signup and view all the answers

What does a method contain?

<p>A header and a body</p> Signup and view all the answers

Some standard operators can be overloaded for use with new classes of objects.

<p>True</p> Signup and view all the answers

What is pickling?

<p>the process of converting an object to a form that can be saved to permanent file storage</p> Signup and view all the answers

The try-except statement is used to catch and handle exceptions.

<p>True</p> Signup and view all the answers

What are the three most important features of object-oriented programming?

<p>encapsulation, inheritance, and polymorphism</p> Signup and view all the answers

What are the benefits of encapsulation, inheritance, and polymorphism?

<p>simplify programs and make them more maintainable</p> Signup and view all the answers

What is encapsulation?

<p>restricts access to an object's data to users of the methods of its class</p> Signup and view all the answers

What is a data model?

<p>a set of classes that are responsible for managing the data of a program</p> Signup and view all the answers

What is a view?

<p>a set of classes that are responsible for presenting information to a human user and handling user inputs</p> Signup and view all the answers

Study Notes

Instance Variables

  • Instance variables are specific to an individual class instance and are not shared with other instances.

Polymorphism

  • Polymorphic methods possess a single header but can have distinct implementations across different classes.

Class Variables

  • Class variables retain data common to all instances of a class, allowing for shared information among them.

Class Initialization

  • In subclassing, calling the superclass's __init__ method is done with the syntax A.__init__(self) when the constructor expects no arguments.

Object Lifetime

  • An object's lifetime concludes when it is no longer referenced, making it eligible for garbage collection.

Current Instance Reference

  • The term self is utilized within class definitions to refer to the current object instance.

Purpose of __init__

  • The __init__ method initializes instance variables to their starting values when an object is created.

Method Definition

  • Every method defined in a class must include at least one parameter called self, representing the instance.

Object Persistence

  • To save objects permanently, the easiest method involves using the pickle function's dump feature.

Scope of Instance Variables

  • Instance variables are accessible throughout the entire class in which they are declared.

Structure of a Simple Class

  • A simple class is structured with a header and a collection of method definitions.

Class Components

  • Besides methods, classes include instance variables, which store data pertinent to each instance.

Method Composition

  • Each method comprises a header that specifies its name and parameters, along with a body that contains executable statements.

Operator Overloading

  • Certain standard operators can be overloaded, providing customized functionality for new object classes.

Pickling Process

  • Pickling is the method of converting an object into a format suitable for saving to permanent file storage.

Exception Handling

  • The try-except statement aids in managing exceptions that may arise during the execution of a block of statements.

Key Features of OOP

  • Encapsulation, inheritance, and polymorphism are the trio of foundational principles in object-oriented programming.

Simplifying Code Maintenance

  • These principles enhance the simplicity and maintainability of programming endeavors.

Encapsulation Functionality

  • Encapsulation guarantees that access to an object's data is restricted to the methods defined within its class, promoting data integrity.

Data Model Definition

  • A data model encompasses a collection of classes dedicated to managing the data attributes of a program.

Role of a View

  • A view consists of classes that present information to users and manage their inputs, focusing on user interaction.

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Explore key concepts from Python Chapter 9 with these flashcards. Each card provides essential definitions and explanations related to object-oriented programming. Perfect for quick revision and understanding of instance variables, polymorphism, and class variables.

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