Question

The attached file US Population.txt contains the US population 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. You will notice the population numbers are always increasing. So rather than finding the average population over the years, you have been asked to find the average annual change during the time period instead. the year with the greatest increase in population during the time period (highest growth rate) • the year with the smallest increase in population during the time period (smallest growth rate)

Answer 1

PROGRAM :

try:

fp = open("Population.txt", "r")

avg = 0

prev_pop = int(fp.readline())

greatest_chg_yr = 1951

greatest_chg = 0

smallest_chg_yr = 1990

smallest_chg = prev_pop

c = 0

for line in fp.readlines():

curr_pop = int(line)

change = curr_pop - prev_pop

if(change>greatest_chg):

greatest_chg = change

greatest_chg_yr = c+1951

if(change<smallest_chg):

smallest_chg = change

smallest_chg_yr = c + 1951

prev_pop = curr_pop

avg += change

c += 1

fp.close()

avg /= c

print("Average annual change during the time period: "+str(avg))

print("The year with the greatest increase in population during the time period (highest growth rate): "+str(greatest_chg_yr))

print("The year with the smallest increase in population during the time period (smallest growth rate): "+str(smallest_chg_yr))

except FileNotFoundError:

print("Unable to open file Population.txt")

Population.txt:

151868 153982 156393 158956 161884 165069 168088 171187 174149 177135 179979 182992 185771 188483 191141 193526 195576 197457 199399 201385 203984 206827 209284 211357 213342 215465 217563 219760 222095 224567 227225 229466 231664 233792 235825 237924 240133 242289 244499 246819 249623

OUTPUT :

Average annual change during the time period: 2443.875 The year with the greatest increase in population during the time period (highest growth rate): 1955 The year with the smallest increase in population during the time period (smallest growth rate): 1967