Chapter 14: Python Objects

Question 1

A variable that is part of a class.

Answer 1

attribute

Question 2

A template that can be used to construct an object. Defines the attributes and methods that will make up the object.
Like a cookie cutter that creates cookies (objects)

Answer 2

class

Question 3

A new class created when a parent class is extended. Inherits all of the attributes and methods of the parent class.

Answer 3

child class

Question 4

An optional specially named method (__init__) that is called at the moment when a class is being used to construct an object. Usually this is used to set up initial values for the object.

Answer 4

constructor

Question 5

An optional specially named method (__del__) that is called at the moment just before an object is destroyed. These are rarely used.

Answer 5

destructor

Question 6

When we create a new class (child) by extending an existing class (parent). The child class has all the attributes and methods of the parent class plus additional attributes and methods defined by the child class.

Answer 6

inheritance

Question 7

A function that is contained within a class and the objects that are constructed from the class. Some object-oriented patterns use ‘message’ to describe this concept.

Answer 7

method

Question 8

A constructed instance of a class. Contains all of the attributes and methods that were defined by the class. Some object-oriented documentation uses the term ‘instance’ interchangeably with this.

Answer 8

object

an = PartyAnimal() similar to counts = dict()
(constructs object using dict template, returns instance of dictionary, assigns to counts variable)

Question 9

The class which is being extended to create a new child class. The parent class contributes all of its methods and attributes to the new child class.
Aka super

Answer 9

parent class

Question 10

List method to retrieve items from a list

Answer 10

__getitem__
list.__getitem__(index)
list_class.__getitem__(list, index)

Question 11

called to do any initial setup of the data we want to store in the object

Answer 11

__init__()

def __init__(self):

Question 12

First class method parameter that gives us access to the object instance so we can set attributes and call methods using dot notation.

Answer 12

self
self.x = 0

Question 13

keyword defines a template indicating what data and code will be contained in each object of type (name)

Answer 13

class

class PartyAnimal:
indented methods and attributes

Question 14

Class object lifecycle

Answer 14

Define a class (template), use that class to create an instance of that class (object), and then use the instance. When the program finishes, all of the variables are discarded

Question 15

special syntax for init method in child class to call init method from parent class

Answer 15

super().__init__(parameter)