1 An instance variable refers to a data value that a is owned by an particular i
ID: 3670628 • Letter: 1
Question
1 An instance variable refers to a data value that
a is owned by an particular instance of a class and no other
b is shared in common and can be accessed by all instances of a
given class
2 The name used to refer the current instance of a class within the class
definition is
a this
b other
c self
3 The purpose of the __init__ method in a class definition is to
a build and return a string representation of the instance variables
b set the instance variables to initial values
4 A method definition
a can have zero or more parameter names
b always must have at least one parameter name, called self
5 The scope of an instance variable is
a the statements in the body of the method where it is introduced
b the entire class in which it is introduced
c the entire module where it is introduced
6 An object’s lifetime ends
a several hours after it is created
b when it can no longer be referenced anywhere in a program
c when its data storage is recycled by the garbage collector
7 A class variable is used for data that
a all instances of a class have in common
b each instance owns separately
8 Class B is a subclass of class A. The __init__ methods in both classes
expect no arguments. The call of class A’s __init__ method in class B is
a A.__init__()
b A.__init__(self)
9 The easiest way to save objects to permanent storage is to
a convert them to strings and save this text to a text file
b pickle them using the cPickle method save
10 A polymorphic method
a has a single header but different bodies in different classes
b creates harmony in a software system
Explanation / Answer
1.A
2.A
3.B
4.A
5.B
6.C
7.A
8.B
9.B
10.A
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