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, 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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