LESSON 3

Question 1

__ is a user-defined blueprint or prototype from which objects are created. __ provide a means of bundling data and functionality together

Answer 1

class, Classes

Question 2

Creating a new class creates a new type of ___, allowing new instances of that type to be made.

Answer 2

object

Question 3

creates a user-defined data structure, which holds its own data members and member functions, which can be accessed and used by creating an instance of that class.

Answer 3

Class

Question 4

is like a blueprint for an object

Answer 4

Class

Question 5

Some points on Python class:

Answer 5

● Classes are created by keyword class.
● Attributes are the variables that belong to a class.
● Attributes are always public and can be accessed using the dot (.) operator. Eg.: My class.Myattribute

Question 6

An ___ is an instance of a Class

Answer 6

Object

Question 7

A class is like a ___while an instance is a ___ of the class with actual values

Answer 7

blueprint, copy

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 8

● An object consists of:

Answer 8

State:
Behavior:
Identity:

Question 9

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

Answer 9

State:

Question 10

DECLARING CLASS OBJECTS is also known as

Answer 10

instantiating a class

Question 11

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

Answer 11

Identity:

Question 12

When an object of a class is created,
the class is said to be

Answer 12

instantiated

Question 13

All the ___ share the attributes
and the behavior of the class. But the
values of those attributes, i.e. the state
are __for each object.

Answer 13

instances, unique

Question 13

A __ __ may have any number of
instances.

Answer 13

single class

Question 14

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 14

Self Parameter

Question 15

does not require for you to name it “self”. You can use any other name instead of it.

Answer 15

Self Parameter

Question 16

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

Answer 16

_ init _() method

Question 17

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

Answer 17

destructors

Question 17

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

Answer 17

_ del _() method

Question 18

It is called when all references to the object have been deleted i.e when an object is garbage collected.

Answer 18

_ del _() method

Question 19

The destructor was called ____ or when all the references to object are deleted, i.e when the reference count becomes zero, not when object went out of scope.

Answer 19

after the program ended

Question 20

Advantages of using destructors in Python

Answer 20

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

Question 21

Destructors provide __ ___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 21

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 ___ ____ 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

Destructors are an important feature of object-oriented programming and can be used to enforce encapsulation and other principles of object-oriented design.

Answer 23

Supports object-oriented programming

Question 24

Destructors can be useful for debugging, as they can be used to trace the lifecycle of an object and determine when it is being destroyed

Answer 24

Helps with debugging

Question 25

is used to define how a class object should be represented as a string.

Answer 25

_ str _() method

Question 26

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 26

_ str _() method

Question 27

are 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

are variables 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

Question 29

We can define instance variables within 2 ways

Answer 29

● Using a constructor
● Using Getters and Setters (normal way)