LESSON 3

Question 1

_______
user-defined ______ or prototype from which objects are created.

Answer 1

• Class
• Blueprint

Question 2

provide a means of _______ and functionality together.

Answer 2

• Classes
• Bundling data

Question 3

are variables that belong to a class

Answer 3

Attributes

Question 4

are always _____ and can
be accessed using the dot (.) operator.

Answer 4

• Attributes
• Public

Question 5

is an instance of a Class

Answer 5

Object

Question 6

like a blueprint while an instance is
a copy of the class with actual values

Answer 6

Class

Question 7

It is represented by the attributes of an
object. It also reflects the properties of an object.

Answer 7

State

Question 8

It is represented by the methods of an
object. It also reflects the response of an object to other objects.

Answer 8

Behavior

Question 9

It gives a unique name to an object and
enables one object to interact with other objects.

Answer 9

Identity

Question 10

DECLARING CLASS OBJECTS
(also known as instantiating a class)

Answer 10

When an object of a class is created,
the class is said to be instantiated.
● Alltheinstancessharetheattributes
and the behavior of the class. But the values of those attributes, i.e. the state are unique for each object.
● A single class may have any number of instances.

Question 11

When we call a method of this object as pyobject.method(arg1, arg2), this is automatically converted by Python into PyClass.method(myobject, arg1, arg2) – this is all the special self is about.

Answer 11

Self Parameter

Question 12

The Self Parameter does not require for you to name it “______”. Other wise? __________You can use _______ instead of it.

Answer 12

• Self
• any other name

Question 13

• The program’s execution is unaffected by the pass statement’s inaction.
• It merely permits the program to skip past that section of the code without doing anything.

Answer 13

Pass Parameter

Question 13

syntactic constraints of Python demand a valid statement but no useful code must be executed.

Answer 13

Pass Parameter

Question 14

similar to constructors in C++ and Java. Constructors are used to initializing the object’s state.

Answer 14

_ init _() method

Question 15

The__init__method is similar to constructors in ____ and _____.

Answer 15

• C++ and Java

Question 16

known as destructor, which are called when an object gets destroyed.

Answer 16

_ del _() method

Question 17

In ______, destructors are not needed as much as in C++ because Python has a garbage collector that handles memory management automatically.

Answer 17

Python

Question 18

when the reference count becomes zero, not when object went out of scope.

Answer 18

_ del _() method

Question 19

Advantages of using destructors in Python: _ del _() method

Answer 19

• Automatic cleanup
• Consistent behavior
• Easy to use
• Supports object-oriented programming
• Helps with debugging

Question 20

Destructors provide automatic cleanup of resources used by an
object when it is no longer needed. This can be especially useful in cases where resources are limited, or where failure to clean up can lead to memory leaks or other issues.

Answer 20

Automatic cleanup

Question 21

Destructors ensure that an object is properly cleaned up, regardless of how it is used or when it is destroyed. This helps to ensure consistent behavior and can help to prevent bugs and other issues.

Answer 21

Consistent behavior

Question 22

Destructors are easy to implement in Python and can be defined using the __del__() method

Answer 22

Easy to use

Question 23

Easy to use: Destructors are easy to implement in Python and can be defined using the _______

Answer 23

__del__() method

Question 24

define how a class object should be represented as a string.

Answer 24

_ str _() method

Question 25

It is often used to give an object a human- readable textual representation, which is helpful for logging, debugging, or showing users object information.

Answer 25

_ str _() method

Question 26

When a class object is used to create a string using the built-in functions ____ and ____, the __str__() function is automatically used.

Answer 26

• print() and str()

Question 27

for data, unique to each instance and class variables are for attributes and methods shared by all instances of the class.

Answer 27

Instance Variables

Question 28

whose value is assigned inside a constructor or method with self whereas class variables are variables whose value is assigned in the class.

Answer 28

Instance Variables