Question 1

The Python interpreter picks out equality from the other comparisons by looking for an __equals__ method when it encounters the == and != operators.

Accepted Answer

A) True 
 B)False

Question 2

Inheritance allows a class to automatically reuse and extend the code of similar but more general classes.

Accepted Answer

A) True 
 B)False

Question 3

As a rule of thumb, when should you include an __eq__ method in a class?

Accepted Answer

A)   Always, because the comparison for equality is not compatible with classes.
B)   Whenever a comparison for equality uses criterion other than object identity.
C)   Only when you need to be able to make a comparison based on object identity.
D)   Only if you plan to export the class as part of a module.E) A) and B)
F) B) and C)

Question 4

The attributes of an object are represented as what type of variables?

Accepted Answer

A)   state variables
B)   substance variables
C)   instance variables
D)   self variablesE) A) and B)
F) B) and D)

Question 5

Unlike other object-oriented languages, Python does not support polymorphic methods.

Accepted Answer

A) True 
 B)False

Question 6

What are the two parts of a rational number? (Choose two.)

Accepted Answer

A)   dominator
B)   denominator
C)   numerator
D)   terminatorE) B) and D)
F) A) and C)

Question 7

What method is known as a class's constructor, because it is run automatically when a user instantiates the class?

Accepted Answer

A)   __start__
B)   __build__
C)   __main__
D)   __init__E) None of the above
F) A) and C)

Question 8

What type of programming is defined by the term "functional programming"?

Accepted Answer

A)   Programming utilizing cooperative subprograms to solve problems.
B)   Programming using input and output statements, assignment statements, and control statements for selection and iteration.
C)   Programming such that classes can be defined for objects and reused to define similar objects.
D)   Programming using a set of cooperating functions rather than relying on assignment.E) C) and D)
F) B) and D)

Question 9

If the parenthesized parent class name is omitted from the class definition, the new class is automatically made a subclass of self.

Accepted Answer

A) True 
 B)False

Question 10

What type of programming is defined by the term "procedural programming"?

Accepted Answer

A)   Programming utilizing cooperative subprograms to solve problems.
B)   Programming using input and output statements, assignment statements, and control statements for selection and iteration.
C)   Programming such that classes can be defined for objects and reused to define similar objects.
D)   Programming using a set of cooperating functions rather than relying on assignment.E) All of the above
F) A) and B)

Question 11

Python programmers typically capitalize their own class names to distinguish them from variable names.

Accepted Answer

A) True 
 B)False

Question 12

In the context of Python objects, what does the pickling process do?

Accepted Answer

A)   It preserves objects by storing them in memory.
B)   It preserves objects by storing them to a file.
C)   It preserves objects by creating a sqlite database.
D)   It preserves objects by adding them to the calling Python script file.E) A) and C)
F) All of the above

Question 13

Any object can be pickled before it is saved to a file, and then unpickled as it is loaded from a file into a program.

Accepted Answer

A) True 
 B)False

Question 14

In Python, when does an object reach the end of its life?

Accepted Answer

A)   When its timeout value has expired.
B)   When it has been terminated by the destroy method.
C)   When it has passed the last statement that uses it.
D)   When it can no longer be referred to by the program that created it.E) B) and D)
F) C) and D)

Question 15

What are the two access modes that are used when opening a file for input and output when pickling? (Choose two.)

Accepted Answer

A)   r
B)   rb
C)   w
D)   wbE) All of the above
F) A) and D)

Question 16

The str method is a good example of a polymorphic method that appears throughout Python's system of classes.

Accepted Answer

A) True 
 B)False

Question 17

Python has a built-in type for rational numbers called rational.

Accepted Answer

A) True 
 B)False

Question 18

What type of programming is defined by the term "imperative programming"?

Accepted Answer

A)   Programming such that classes can be defined for objects and reused to define similar objects.
B)   Programming that involves the use of input and output statements, assignment statements, and control statements for selection and iteration.
C)   Programming that uses cooperating subprograms to solve problems.
D)   Programming that views a program as a set of cooperating functions.E) B) and C)
F) A) and D)

Question 19

When the pickle.load function reaches the end of a file, what type of exception is raised?

Accepted Answer

A)   IOError
B)   EOFError
C)   DataError
D)   FileErrorE) All of the above
F) B) and C)

Question 20

A method automatically returns the value None when it includes no return statement.

Accepted Answer

A) True 
 B)False

Exam 9: Design With Classes

If the parenthesized parent class name is omitted from the class definition, the new class is automatically made a subclass of self.

Correct AnswerverifiedShow Answer

Unlike other object-oriented languages, Python does not support polymorphic methods.

Correct AnswerverifiedShow Answer

What are the two access modes that are used when opening a file for input and output when pickling? (Choose two.)

Correct AnswerverifiedShow Answer

What type of programming is defined by the term "functional programming"?

Correct AnswerverifiedShow Answer

Any object can be pickled before it is saved to a file, and then unpickled as it is loaded from a file into a program.

Correct AnswerverifiedShow Answer

When the pickle.load function reaches the end of a file, what type of exception is raised?

Correct AnswerverifiedShow Answer

In Python, when does an object reach the end of its life?

Correct AnswerverifiedShow Answer

Inheritance allows a class to automatically reuse and extend the code of similar but more general classes.

Correct AnswerverifiedShow Answer

Python programmers typically capitalize their own class names to distinguish them from variable names.

Correct AnswerverifiedShow Answer

What method is known as a class's constructor, because it is run automatically when a user instantiates the class?

Correct AnswerverifiedShow Answer

As a rule of thumb, when should you include an __eq__ method in a class?

Correct AnswerverifiedShow Answer

In the context of Python objects, what does the pickling process do?

Correct AnswerverifiedShow Answer

The attributes of an object are represented as what type of variables?

Correct AnswerverifiedShow Answer

What type of programming is defined by the term "imperative programming"?

Correct AnswerverifiedShow Answer

What type of programming is defined by the term "procedural programming"?

Correct AnswerverifiedShow Answer

A method automatically returns the value None when it includes no return statement.

Correct AnswerverifiedShow Answer

The str method is a good example of a polymorphic method that appears throughout Python's system of classes.

Correct AnswerverifiedShow Answer

The Python interpreter picks out equality from the other comparisons by looking for an __equals__ method when it encounters the == and != operators.

Correct AnswerverifiedShow Answer

Python has a built-in type for rational numbers called rational.

Correct AnswerverifiedShow Answer

What are the two parts of a rational number? (Choose two.)

Correct AnswerverifiedShow Answer

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As a rule of thumb, when should you include an eq method in a class?

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The Python interpreter picks out equality from the other comparisons by looking for an equals method when it encounters the == and != operators.

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