Starting Out with Python (4th Edition)
Starting Out with Python (4th Edition)
4th Edition
ISBN: 9780134444321
Author: Tony Gaddis
Publisher: PEARSON
Question
Book Icon
Chapter 7, Problem 9PE
Program Plan Intro

Population data

Program plan:

  • • Declare a function named “main()”. Inside the function,
    • ○ Use the “try…except” block to read the population from the file.
    • ○ Create a file object “fileObj” for the file “USPopulation.txt”
    • ○ Now, read the populations from the file and store it in “populationList” and close the file.
    • ○ Use a “for” loop to convert the populations into “float” type.
    • ○ Create an empty list “populationChange” to hold the changes in the population.
    • ○ Now, use the “for” loop to find the population change for the successive years and store it in “populationChange”.
    • ○ Call the function “max()” to find the greatest population change.
    • ○ Call the function “index()” to find the position of the greatest population change.
    • ○ Call the function “min()” to find the lowest population change.
    • ○ Call the function “index()” to find the position of the lowest population change.
    • ○ Then, call the function “sum()” to find the sum of the population changes in the “populationChange”.
    • ○ Find the average annual change.
    • ○ Now, print the average annual change, greatest population change year, and lowest population change year using the “print()” function.
    • ○ Handle the exceptions if any occurred using the “except” blocks.
  • • In the last, call the function “main()” to execute the program.

Blurred answer
Students have asked these similar questions
5. Charge Account Validation If you have downloaded the source code from the Computer Science Portal you will find a file named charge_accounts.txt in the Chapter 07 folder. This file has a list of a com- pany's valid charge account numbers. Each account number is a seven-digit number, such as 5658845. Programming Exercises 403 program Write a program that reads the contents of the file into a list. The program should then ask the user to enter a charge account number. The program should determine whether the number is valid by searching for it in the list. If the number is in the list, the should display a message indicating the number is valid. If the number is not in the list, the program should display a message indicating the number is invalid. (You can access the
1994 Weekly Gas GraphIn the student sample programs for this book, you will find a text file named 1994_Weekly_Gas_Averages.txt. The file contains the average gas price for each week in the year 1994.(There are 52 lines in the file.) Using matplotlib, write a Python program that reads thecontents of the file then plots the data as either a line graph or a bar chart. Be sure to displaymeaningful labels along the X and Y axes, as well as the tick marks.   (in python)
If you have downloaded the source code from this book’s companion Web site, you will find a file named USPopulation.txt in the Chapter 07 folder. The file contains the midyear population of the United States, in thousands, during the years 1950 through 1990. The first line in the file contains the population for 1950, the second line contains the population for 1951, and so forth.Write a program that reads the file’s contents into a list. The program should display the following data:• The average annual change in population during the time period• The year with the greatest increase in population during the time period• The year with the smallest increase in population during the time period(You can access the book’s companion Web site at www.pearsonglobaleditions.com/gaddis.)

Chapter 7 Solutions

Starting Out with Python (4th Edition)

Ch. 7.3 - Prob. 11CPCh. 7.3 - Prob. 12CPCh. 7.3 - Prob. 13CPCh. 7.4 - What will the following code display? names =...Ch. 7.5 - Prob. 15CPCh. 7.5 - Prob. 16CPCh. 7.5 - Prob. 17CPCh. 7.5 - Prob. 18CPCh. 7.8 - Prob. 19CPCh. 7.8 - Prob. 20CPCh. 7.8 - Write a set of nested loops that display the...Ch. 7.9 - Prob. 22CPCh. 7.9 - Prob. 23CPCh. 7.9 - Prob. 24CPCh. 7.9 - Prob. 25CPCh. 7.10 - Prob. 26CPCh. 7.10 - Prob. 27CPCh. 7.10 - Prob. 28CPCh. 7.10 - Prob. 29CPCh. 7.10 - Prob. 30CPCh. 7.10 - To create a bar chart with the bar function, what...Ch. 7.10 - Assume the following statement calls the bar...Ch. 7.10 - Prob. 33CPCh. 7 - This term refers to an individual item in a list....Ch. 7 - This is a number that identifies an item in a...Ch. 7 - Prob. 3MCCh. 7 - This is the last index in a list. a. 1 b. 99 c. 0...Ch. 7 - This will happen if you try to use an index that...Ch. 7 - This function returns the length of a list. a....Ch. 7 - When the operator's left operand is a list and...Ch. 7 - This list method adds an item to the end of an...Ch. 7 - This removes an item at a specific index in a...Ch. 7 - Prob. 10MCCh. 7 - If you call the index method to locate an item in...Ch. 7 - Prob. 12MCCh. 7 - This file object method returns a list containing...Ch. 7 - Which of the following statement creates a tuple?...Ch. 7 - Prob. 1TFCh. 7 - Prob. 2TFCh. 7 - Prob. 3TFCh. 7 - Prob. 4TFCh. 7 - A file object's writelines method automatically...Ch. 7 - You can use the + operator to concatenate two...Ch. 7 - Prob. 7TFCh. 7 - You can remove an element from a tuple by calling...Ch. 7 - Prob. 1SACh. 7 - Prob. 2SACh. 7 - What will the following code display? values = [2,...Ch. 7 - Prob. 4SACh. 7 - Prob. 5SACh. 7 - Prob. 6SACh. 7 - Prob. 1AWCh. 7 - Prob. 2AWCh. 7 - Prob. 3AWCh. 7 - Prob. 4AWCh. 7 - Write a function that accepts a list as an...Ch. 7 - Prob. 6AWCh. 7 - Prob. 7AWCh. 7 - Prob. 8AWCh. 7 - Total Sales Design a program that asks the user to...Ch. 7 - Prob. 2PECh. 7 - Rainfall Statistics Design a program that lets the...Ch. 7 - Prob. 4PECh. 7 - Prob. 5PECh. 7 - Larger Than n In a program, write a function that...Ch. 7 - Drivers License Exam The local driver s license...Ch. 7 - Name Search If you have downloaded the source code...Ch. 7 - Prob. 9PECh. 7 - World Series Champions If you have downloaded the...Ch. 7 - Prob. 11PECh. 7 - Prob. 12PECh. 7 - Magic 8 Ball Write a program that simulates a...Ch. 7 - Expense Pie Chart Create a text file that contains...Ch. 7 - 1994 Weekly Gas Graph In the student sample...
Knowledge Booster
Background pattern image
Similar questions
SEE MORE QUESTIONS
Recommended textbooks for you
Text book image
EBK JAVA PROGRAMMING
Computer Science
ISBN:9781337671385
Author:FARRELL
Publisher:CENGAGE LEARNING - CONSIGNMENT
Text book image
Programming with Microsoft Visual Basic 2017
Computer Science
ISBN:9781337102124
Author:Diane Zak
Publisher:Cengage Learning