Question 1

Which of the following is one of the hallmarks of well-designed software?

Accepted Answer

A)   a random grouping of interfaces to ensure secure code
B)   an interface that is tightly coupled to the implementation
C)   the clean separation of interfaces from implementations
D)   a sophisticated interface with a high learning curve C

Question 2

What method does Python run when it sees the in operator used with a collection?

Accepted Answer

A)   __contains__
B)   __iter__
C)   __eq__
D)   __add__ A

Question 3

While desirable, testing is not a critical part of software resource development.

Accepted Answer

A) True 
 B)False  False

Question 4

You can use a for loop on any collection.

Accepted Answer

A) True 
 B)False

Question 5

A docstring is a string enclosed in double quotes that will be displayed when Python's help function is run on a resource.

Accepted Answer

A) True 
 B)False

Question 6

What does Python do when it sees a for loop on an iterable object?

Accepted Answer

A)   executes a do loop
B)   runs the __iter__ method
C)   runs the clear method
D)   executes a return statement

Question 7

In the remove method for LinkedBag, if probe points to the node at the head of the linked structure, trailer will point to the tail.

Accepted Answer

A) True 
 B)False

Question 8

What is one of the pieces of data that must be initialized in the __init__ method in the LinkedBag class?

Accepted Answer

A)   an array
B)   a linked structure
C)   a physical size
D)   a string pointer

Question 9

In the ArrayBag class, what must the __init__ method do if a source collection is specified?

Accepted Answer

A)   the new instantiation of the bag must be copied to the source collection.
B)   the source collection must be initialized with the clear method
C)   the data in the source collection must be deleted
D)   the data in the source collection must be copied

Question 10

Which of the following methods will require changes between the ArrayBag and the LinkedBag class?

Accepted Answer

A)   isEmpty
B)   remove
C)   __eq__
D)   __len__

Question 11

Which is true about a bag collection?

Accepted Answer

A)   it is an unordered collection
B)   it is a standard collection type in Python
C)   bags can contain only numeric objects
D)   bags are of a fixed size

Question 12

Class diagrams show the relationships among classes at various levels of detail.

Accepted Answer

A) True 
 B)False

Question 13

The following code copies the data from a specified source collection in the LinkedBag __init__ method. What is the missing code? for item in sourceCollection:

Accepted Answer

A)   add(item.self) 
B)   self.add(item) 
C)   self.item(add) 
D)   self.item = source.item

Question 14

Which of the following is NOT a goal of the barrier that separates an interface from implementation?

Accepted Answer

A)   allows users to quickly glue resources together
B)   allows alternative implementations of the same resource
C)   changes to a resource's implementations do not disturb user code
D)   increases the learning curve for resource's users

Question 15

How can the performance of the in and remove functions be described in the two bag implementations?

Accepted Answer

A)   they take linear time
B)   they take constant time
C)   the performance is exponential according to the size of the bag
D)   the performance is logarithmic according to the size of the bag

Question 16

Data that is needed to represent the state of a collection are assigned instance variables in the __help__ method of the class.

Accepted Answer

A) True 
 B)False

Question 17

Each time you run Python's document function to obtain information about a module, data type, method, or function, you are accessing documentation about that resource's interface.

Accepted Answer

A) True 
 B)False

Question 18

A precondition is a statement of what must be true for a method to perform its actions correctly.

Accepted Answer

A) True 
 B)False

Question 19

The code for the __iter__ method is shown below. What is the missing code?
Def __iter__(self):

While cursor < len(self):
Yield self.items[cursor]
Cursor += 1

Accepted Answer

A)   cursor = 0
B)   cursor = 1
C)   cursor = self.size
D)   cursor = len(self)

Question 20

What testing tool can be used to help ensure that a resource meets its requirements?

Accepted Answer

A)   unittest
B)   pytest
C)   pyunit
D)   unitcheck

Exam 5: Interfaces, Implementations, and Polymorphism

Which of the following is one of the hallmarks of well-designed software?

What method does Python run when it sees the in operator used with a collection?

While desirable, testing is not a critical part of software resource development.

You can use a for loop on any collection.

A docstring is a string enclosed in double quotes that will be displayed when Python's help function is run on a resource.

What does Python do when it sees a for loop on an iterable object?

In the remove method for LinkedBag, if probe points to the node at the head of the linked structure, trailer will point to the tail.

What is one of the pieces of data that must be initialized in the init method in the LinkedBag class?

In the ArrayBag class, what must the init method do if a source collection is specified?

Which of the following methods will require changes between the ArrayBag and the LinkedBag class?

Which is true about a bag collection?

Class diagrams show the relationships among classes at various levels of detail.

The following code copies the data from a specified source collection in the LinkedBag init method. What is the missing code? for item in sourceCollection: < missing code >

Which of the following is NOT a goal of the barrier that separates an interface from implementation?

How can the performance of the in and remove functions be described in the two bag implementations?

Data that is needed to represent the state of a collection are assigned instance variables in the help method of the class.

Each time you run Python's document function to obtain information about a module, data type, method, or function, you are accessing documentation about that resource's interface.

A precondition is a statement of what must be true for a method to perform its actions correctly.

The code for the iter method is shown below. What is the missing code? Def iter(self) : < missing code > While cursor < len(self) : Yield self.items[cursor] Cursor += 1

What testing tool can be used to help ensure that a resource meets its requirements?

Exam 5: Interfaces, Implementations, and Polymorphism

Which of the following is one of the hallmarks of well-designed software?

What method does Python run when it sees the in operator used with a collection?

While desirable, testing is not a critical part of software resource development.

You can use a for loop on any collection.

A docstring is a string enclosed in double quotes that will be displayed when Python's help function is run on a resource.

What does Python do when it sees a for loop on an iterable object?

In the remove method for LinkedBag, if probe points to the node at the head of the linked structure, trailer will point to the tail.

What is one of the pieces of data that must be initialized in the __init__ method in the LinkedBag class?

In the ArrayBag class, what must the __init__ method do if a source collection is specified?

Which of the following methods will require changes between the ArrayBag and the LinkedBag class?

Which is true about a bag collection?

Class diagrams show the relationships among classes at various levels of detail.

The following code copies the data from a specified source collection in the LinkedBag __init__ method. What is the missing code? for item in sourceCollection: < missing code >

Which of the following is NOT a goal of the barrier that separates an interface from implementation?

How can the performance of the in and remove functions be described in the two bag implementations?

Data that is needed to represent the state of a collection are assigned instance variables in the __help__ method of the class.

Each time you run Python's document function to obtain information about a module, data type, method, or function, you are accessing documentation about that resource's interface.

A precondition is a statement of what must be true for a method to perform its actions correctly.

The code for the __iter__ method is shown below. What is the missing code? Def __iter__(self) : < missing code > While cursor < len(self) : Yield self.items[cursor] Cursor += 1

What testing tool can be used to help ensure that a resource meets its requirements?

What is one of the pieces of data that must be initialized in the init method in the LinkedBag class?

In the ArrayBag class, what must the init method do if a source collection is specified?

The following code copies the data from a specified source collection in the LinkedBag init method. What is the missing code? for item in sourceCollection: < missing code >

Data that is needed to represent the state of a collection are assigned instance variables in the help method of the class.

The code for the iter method is shown below. What is the missing code? Def iter(self) : < missing code > While cursor < len(self) : Yield self.items[cursor] Cursor += 1