程序代写代做代考 python Starting Out with Python 4e (Gaddis)

Starting Out with Python 4e (Gaddis)
Chapter 11 Inheritance

TRUE/FALSE

1. New attributes and methods may be added to a subclass.

ANS: T

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

ANS: F

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

ANS: F

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

ANS: T

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

ANS: F

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

ANS: F

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

ANS: T

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

ANS: F

9. An “is a” relationship exists between a grasshopper and a bumblebee.

ANS: F

10. An “is a” relationship exists between a wrench and a tool.

ANS: T

MULTIPLE CHOICE

1. __________ allows a new class to inherit members of the class it extends.
a.
Encapsulation

b.
Attributes

c.
Methods

d.
Inheritance

ANS: D

2. What gives a program the ability to call the correct method depending on the type of object that is used to call it?
a.
Polymorphism

b.
Inheritance

c.
Encapsulation

d.
Methods

ANS: A

3. What does a subclass inherit from a superclass?
a.
instances and attributes

b.
objects and methods

c.
methods and instances

d.
attributes and methods

ANS: D

4. In a UML diagram, what does the open arrowhead point to?
a.
the superclass

b.
the subclass

c.
the object

d.
a method

ANS: A

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

b.
subclass

c.
object

d.
method

ANS: A

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

b.
a subclass

c.
an object

d.
an instance

ANS: B

7. Base classes are also called
a.
superclasses

b.
derived classes

c.
subclasses

d.
class instances

ANS: A

8. What is the relationshop called in which one object is a specialized version of another object?
a.
parent-child

b.
node-to-node

c.
is a

d.
class-subclass

ANS: C

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

b.
Encapsulation

c.
Polymorphism

d.
the ‘is a’ relationship

ANS: C

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

b.
Flower

c.
Rose(Flower)

d.
None of these

ANS: A

11. In the following line of code, what is the name of the base class?
class Python(Course):
a.
Python

b.
Course

c.
Python(Course)

d.
None of these

ANS: B

12. Given the following line of code, in a UML diagram, what would the open arrowhead point to?
class Celery(Vegetable):
a.
Celery

b.
Vegetable

c.
class

d.
Celery(Vegetable)

ANS: B

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

b.
Flavor

c.
either one

d.
neither; these are inappropriate class or subclass names

ANS: A

14. Which method can you use to determine whether an object is an instance of a class?
a.
isinstance

b.
isclass

c.
isobject

d.
issubclass

ANS: A

15. Which of the following is the correct syntax for defining a class, table, which inherits from the furniture class?
a.
class furniture[table]:

b.
class table.furniture:

c.
class furniture(table):

d.
class table(furniture):

ANS: D

16. Given the following beginning of a class definition for a superclass named clock, how many accessor and mutator methods will be needed to complete the class definition?
class clock:
def __init__(self, shape, color, price):
self._shape = shape
self.color = color
self.price = price
a.
1 mutator, 1 accessor

b.
3 mutator, 4 accessor

c.
3 mutator, 3 accessor

d.
4 mutator, 5 accessor

ANS: C

COMPLETION

1. __________ allows subclasses to have methods with the same names as methods in their superclasses.

ANS: Polymorphism

2. The __________ function determines whether or not an object is an instance of a specific class or an instance of a subclass of that class.

ANS: isinstance

3. A subclass is also called a(n) __________ class.

ANS: derived

4. A superclass is also called a(n) __________ class.

ANS: base

5. When a subclass method has the same name as a superclass method, the subclass method __________ the superclass method.

ANS: overrides

6. In an inheritance relationship, the extended class is called the __________.

ANS: subclass

7. New attributes and methods may be added to a subclass which makes it a(n) __________ version of the superclass.

ANS: specialized

8. In an inheritance relationship, a minivan can be thought of as a(n) ___________ of the vehicles class.

ANS: subclass, derived class

9. The term ___________ refers to an object’s ability to take different forms.

ANS: polymorphism

10. In a UML diagram, a line with an open arrowhead from a subclass to a superclass indicates ___________.

ANS: inheritance