CECS 100
LAB ASSIGNMENT 10
Assigned date: 11/4
Due date:   Monday 11/13
30 points

Do problem 9 (Population Data) in chapter 7 on page 404.  Data file
Please submit the lab assignment to Beachboard by Friday, November 8.

Since we do not meet this week, I provide some guidelines on how to do the problem 1.

# The program assumes that all population changes are positive.
# That is, that each year the population was larger than the
# previous year.

def main():

    # Setup variables
    yearly_change = []
    change = 0.0
    total_change = 0.0
    average_change = 0.0
    greatest_increase = 0.0
    smallest_increase = 0.0
    greatest_year = 0
    smallest_year = 0

    # Constant for the base year
    BASE_YEAR = 1950
   
    try:
        # Open the file for reading.
        ________________________________________________
       
        # Read all the lines in the file into a list.
        ____________________________________
       
        # Turn all read strings into numbers. Use a for  in  loop
        ______________________
            yearly_population[i] = ________________________ # use float operator to convert string into numbers

        # Calculate the change in population size for each two years.
        for i in range(1, len(yearly_population)):
            change = yearly_population[i] -___________________
            yearly_change.append(change)

            # If this is the first year, set trackers to its value.
            if i==1:
                greatest_increase = change
                smallest_increase = _____________
                greatest_year = 1
                smallest_year = ___________

            # This is not the first change in population size.
            # Update trackers if relevant.
            else:
                if change > greatest_increase:
                    greatest_increase = _________
                    greatest_year = i
                   
                elif _____________________
                    _____________________
                   _____________________

        total_change = _________________________  # use sum function and float
        average_change = ________________________________

        print('The average annual change in population ' \
              'during the time period is', format(______________________)) # format to 2 decimal places
        print('The year with the greatest increase in population was', \
             _______________________)
        print('The year with the smallest increase in population was', \
             __________________________)
       
    except IOError:
        print('The file could not be found.')
    except IndexError:
        print('There was an indexing error.')
    except:
        print('An error occurred.')

# Call the main function.
main()

Grading

• Demonstrate the result to the instructor
• Return a printout of the program