Chapter 5, Part 2

Question 1

void function

Answer 1

Group of statements within a program for performing a specific task. Does not return a value to the statement that called it. When you need to perform the task, you call the function.

Question 2

value-returning function

Answer 2

Similar to void function (group of statements within a program for performing a specific task), but also returns a value. The value is returned to part of the program that called the function when function finishes executing.

Question 3

Standard library

Answer 3

Library of pre-written functions that comes with Python. Library functions perform tasks that programmers commonly need. print(), range() and input() are a few examples.

Question 4

Modules

Answer 4

Files that stores functions of the standard library. To call a function stored in a module, you need to write an import statement.

Question 5

Random module

Answer 5

Includes library functions for working with random numbers.

Question 6

Dot notation

Answer 6

Notation for calling a function that belongs to a module.

ex: module_name.function_name()

Question 7

randint function

Answer 7

Generates a random integer in the range provided by the arguments.

Question 8

randrange function

Answer 8

Similar to range function, but returns randomly selected integer from the resulting sequence. You pass the same arguments as you do to the range function.

Question 9

random function

Answer 9

Returns a random float in the range of 0.1 to 1.0. Does not receive arguments.

Question 10

uniform function

Answer 10

Returns a random float, but allows user to specify range.

Question 11

Seed value

Answer 11

Initializes the formula that generates random numbers. Need to use different seeds in order to get different series of random numbers. By default, system time is used for seed. Can use random.seed() to specify desired seed value.

Question 12

The random numbers created by functions in the random module are actually….

Answer 12

….pseudo-random numbers.

Question 13

How do you write a value-returning function?

Answer 13

To write a value-returning function, you write a simple function and add one or more return statements at the end of the function definition.

Question 14

Name 3 reasons why value-returning functions can be useful in specific situations.

Answer 14

1. You can have the function prompt the user for input and return the user’s input.
2. Simplify mathematical expressions.
3. Complex calculations that need to be repeated throughout the program.

Question 15

IPO chart

Answer 15

Describes the input, processing and output of the function. An IPO chart is a tool for designing and documenting functions.

Question 16

Boolean function

Answer 16

Returns either True or False. Used to test a condition such as for repetition or decision structures.

Question 17

How do you return multiple values?

Answer 17

In Python, a function can return multiple values.

Ex: return expression 1, expression 2, expression 3, etc.

When you call such a function in an assignment statement, you need to have an equal number of variable names on the left side of the assignment operator to receive the returned values.

Question 18

math module

Answer 18

part of standard library that contains functions that are useful for performing mathematical calculations.

Question 19

Modularization

Answer 19

Grouping related functions in modules. Makes program easier to understand, test, and maintain.

In large, complex programs, it is important to keep code organized.

Question 20

Menu-driven program

Answer 20

Displays a list of operations on the screen, allowing the user to select the desired operation.