Starting Out with Python (4th Edition)
4th Edition
ISBN: 9780134444321
Author: Tony Gaddis
Publisher: PEARSON
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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.
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Chapter 7 Solutions
Starting Out with Python (4th Edition)
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