Py4e Chapter 14 Flashcards

Questions and Answers

Which came first, the instance or the class?

class

In Object Oriented Programming, what is another name for the 'attributes' of an object?

not methods or forms or messages

At the moment of creation of a new object, Python looks at the _________ definition to define the structure and capabilities of the newly created object.

class

Which of the following is NOT a good synonym for 'class' in Python?

direction Signup and view all the answers

What does this Python statement do if PartyAnimal is a class? `zap = PartyAnimal()`

Use the PartyAnimal template to make a new object and assign it to zap Signup and view all the answers

What is the syntax to look up the fullname attribute in an object stored in the variable colleen?

colleen.fullname Signup and view all the answers

Which of these statements is used to indicate that class A will inherit all the features of class B?

class A(B) : Signup and view all the answers

What keyword is used to indicate the start of a method in a Python class?

def Signup and view all the answers

What is 'self' typically used for in a Python method within a class?

To refer to the instance in which the method is being called Signup and view all the answers

What does the Python dir() function show when we pass an object into it as a parameter?

It shows the methods and attributes of the object Signup and view all the answers

Which of the following is rarely used in Object Oriented Programming?

Destructor Signup and view all the answers

What is a class?

shape of an object, template (the cookie cutter) Signup and view all the answers

What is an object?

also called an instance; the cookie to the cookie cutter, (behavior defined by the class) Signup and view all the answers

What is state in the context of an object?

the set of values of the attributes of a particular object. Signup and view all the answers

What is a method?

a verb; the object's abilities; the function inside the object Signup and view all the answers

What are attributes in the context of an object?

data Signup and view all the answers

Study Notes

Object-Oriented Programming Basics

Classes are foundational structures in Object-Oriented Programming, defining the template for creating objects.
An instance is created based on a class; the class is established before instances can exist.

Class and Object Relationships

Attributes refer to the data elements associated with an object, distinct from methods, forms, or messages.
Upon the instantiation of an object, Python utilizes the class definition to establish its structure and capabilities.
An object, or instance, is a specific realization of a class, embodying the behavior defined by that class.

Class Syntax and Inheritance

The syntax for class inheritance is expressed as class A(B):, indicating that class A inherits features from class B.
Keywords such as def are used to declare methods within a class, signifying the start of method definitions.

Reference and Method Utilization

The keyword "self" within class methods serves to reference the particular instance invoking the method, allowing access to its attributes.
To access an object's attribute, the syntax follows the format: objectname.attribute, e.g., colleen.fullname.

Functions and Object Attributes

The Python built-in function dir() reveals an object's methods and attributes when the object is passed as an argument.

Additional Concepts in OOP

Destructors are infrequently used in object-oriented design, as they handle object cleanup upon termination.
The state of an object is defined by the values of its attributes at any given time.
Methods represent the capabilities of an object, functioning as verbs that execute specific tasks, e.g., string.uppercase() or list.append().

Terminology Definitions

Class: A template defining the structure and behavior of objects (like cookie cutters).
Object: An instance created from a class (like the cookies made from those cutters).
Attributes: Data elements that characterize the object.
Methods: Functions associated with the object, defining its behavior.

These notes encompass the essential concepts and terminology in Python's object-oriented programming as explored in Chapter 14 of Py4e.

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Review key concepts from Chapter 14 of Python for Everybody. This quiz covers important terminology and principles in Object Oriented Programming, including classes and attributes. Test your understanding of these essential programming concepts.