Exam 3

Question 1

What will the following code display?
dct = { ‘Monday’ : 1 , ‘Tuesday’ : 2, ‘Wednesday’ : 3}

print(dct[‘Tuesday’])

Answer 1

ANSWER would be 2 because it’s asking for the dct

Question 2

What will the following code display?

dct = { ·Monday’ : 1 , ‘Tuesday’ : 2, ‘Wednesday’ : 3}

print(dct.get(‘Friday’, ‘not found’))

Answer 2

ANS: not found

Question 3

dct = {1: [0, 1]. 2: [2, 3]. 3: [4, 51]}

print ( dct [ 3] )

Answer 3

ANS: [4, 51]

Question 4

After the following statement executes, what elements will be stored in the myset set?

myset = set ( ‘Saturn’)

Answer 4

ANS: {‘S’, ‘a’, ‘t’, ‘u’, ‘r’, ‘n’}

Question 5

After the following statement executes, what elements will be stored in the myset set?

myset = set( [2, 4, 4, 6, 6, 6, 6])

Answer 5

ANS: {2, 4, 6}

Question 6

After the following statement executes, what elements will be stored in the myset set?

myset = set ( [ ‘a ‘ , ‘bb’ , ‘ccc ‘ , ‘dddd ‘ ] )

Answer 6

ANS: { ‘a ‘ , ‘bb’ , ‘ccc ‘ , ‘dddd ‘}

Question 7

The difference of set1 and aet2 is a set that contains only the elements that appear in set1 but do not appear in set2. T/F

Answer 7

True

Question 8

New attributes and methods may be added to a subclass

Answer 8

True

Question 9

When a class inherits another class, it is required to use all the data attributes and methods of the superclass

Answer 9

False

Question 10

All instances of a class share the same values of the data attributes in the class.

Answer 10

False

Question 11

A class can be thought of as a blueprint that can be used to create an object

Answer 11

True

Question 12

Which method is automatically executed when an instance of a class is created in memory?

Answer 12

ANS: __init__

Question 13

Write the first line of code while creating a class named Worker?

Answer 13

ANS: class Worker:

Question 14

What type of method provides a safe way to return a value from a class’s attribute without changing it

Answer 14

ANS: Accessor

Question 15

In the following line of code, what is the name of the base class?

class Python(Course):

Answer 15

ANS: Course

Question 16

Of the two classes, Cherry and Flavor, which would most likely be the subclass?

Answer 16

ANS: Cherry

Question 17

What are the valid indexes for the string ‘New York’?

Answer 17

ANS: 0 through 7

Question 18

What will be displayed after the following code executes?

mystr = ‘yes’

yourstr = ‘no’

mystr += yourstr * 2

print(mystr)

Answer 18

ANS: ‘yesnono’

Question 19

What will be assigned to the variable some_nums after the following code executes?

special = ‘0123456789’, # ‘abcdfegh’

some_nums = special[0:10:2]

Answer 19

ANS: ‘02468’

Question 20

The following expression is valid:

string[6] = ‘8’

Answer 20

ANS: Invalid

Question 21

What is the return value of the string method lstrip()?

Answer 21

ANS: without leading spaces, \n, extra char,

Question 22

Indexing works with both strings and lists

Answer 22

True

Question 23

A subclass may not override any method other than the __init__ method.

Answer 23

false

Question 24

A superclass inherits attributes and methods from its subclasses without any of them having to be rewritten.

Answer 24

false

Question 25

An "is a" relashonship exists between a grasshopper and a bumblebee

Answer 25

false

Question 26

base classes are also called

Answer 26

superclass

Question 27

Each subclass has a method named __init__ that overrides the superclass's __init__ method.

Answer 27

true

Question 28

``` class clock: def __init__(self, shape, color, price): self._shape = shape self.color = color self.price = price ```

Answer 28

3 mutator, 3 accessor

Question 29

In a UML diagram depicting inheritance, you only need to write the name of the subclass.

Answer 29

false

Question 30

In an inheritance relationship, what is a specialized class called?

Answer 30

a subclass

Question 31

in the following line of code, what is the name of the base class? class Python(Course):

Answer 31

course

Question 32

In the following line of code, what is the name of the subclass? class Rose(Flower):

Answer 32

rose

Question 33

Of the two classes, Cherry and Flavor, which would most likely be the subclass?

Answer 33

cherry

Question 34

One problem with using a UML diagram is that there is no way to indicate inheritance.

Answer 34

false lol the whole point of the diagram is to show inheritance

Question 35

Polymorphism works on any two class methods that have the same name.

Answer 35

true

Question 36

what does a subclass inherit from a superclass?

Answer 36

atrributes and methods

Question 37

what gives a program the ability to call the correct method depending on the type of object that is used to call it?

Answer 37

Pollymorphism

Question 38

When a class inherits another class, it is required to use all the data attributes and methods of the superclass.

Answer 38

false

Question 39

When there are several classes that have many common data attributes, it is better to write a(n) ________ to hold all the general data.

Answer 39

superclass

Question 40

Which of the following is the correct syntax for defining a class, table, which inherits from the furniture class?

Answer 40

class table(furniture):

Question 41

________ allows a new class to inherit members of the class it extends.

Answer 41

inheritance

Question 42

________ has the ability to define a method in a subclass and then define a method with the same name in a superclass.

Answer 42

polymorphism

Question 43

what does it mean to say there is an "is a" relationship between two objects?

Answer 43

When one object is a specialized version of another object, there is an "is a" relationship between them. The specialized object " is a" version of the general object.

Question 44

In an inheritance relationship, the _____ is the general class. a. subclass b. superclass c. slave class d. child class

Answer 44

superclass