Python Ch 9

The easiest way to save objects to permanent storage is to:

pickle them using the pickle function dump

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.__init__(self)

A method contains:

A header and a body

Some standard operators can be overloaded for use with new classes of objects.

True

The try-except statement is used to catch and handle exceptions that might be raised in a set of statements.

True

A simple class consists of:

a header and a sets of method definitions

A class variable is used for data that:

all instances of a class have in common

A method definition

always must have at least one parameter name, called self

A polymorphic method:

has a single header but different bodies in different classes

The three most important features of object-oriented programming are

encapsulation, inheritance, and polymorphism.

In addition to methods a class includes:

instance variables

A data model:

is a set of classes that are responsible for managing the data of a program.

A view is

is a set of classes that are responsible for presenting information to a human user and handling user inputs.

An instance variable refers to the data value that :

is owned by a particular instance of a class and no other

Encapsulation:

restricts access to an object's data to users of the methods of its class.

The name used to refer to the current instance of a class within the class definition is:

self

The purpose of the __init__ method in a class definition is to

set the instance variable to initial values

encapsulation, inheritance, and polymorphism.

simplify programs and make them more maintainable

The scope of an instance variable is:

the entire class in which it is introduced

Pickling is:

the process of converting an object to a form that can be saved to permanent file storage.

A object's lifetime ends:

when it can no longer be referenced anywhere in a program