Question

the language is in Python please help

Instructions from your teacher. Instructions The US Population.txt file contains the midyear population of 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. Create an application that reads the file's contents into a list. The application should do the following: • (15 points) Read the file into an list of integers (multiply by 1000) • Iterate through the array and display: (10 points) Year Population (10 points) Change from previous year (subtract current year minus previous year) (10 points) Percent change in population over last year(change in population divided by previous year population • When complete, display the following based on the changes in population (not changes in percent): • (10 points) Average Population Change • (10 points) Minimum Population Change and Year • (10 points) Maximum Population Change and Year Example Output Year 1950 1951 1952 1953 1954 Population 151868000 153982000 156393000 158956000 161884000 Change N/A 2114000 2411000 2563000 2928000 Percent Change N/A 1.398 1.578 1.64% 1.84%

Answer 1

'''
Python version : 3.6
Python program to read the text file containing US population from year 1950 to 1990
and calculate the change in population and its percent change and calculate the average
population change, minimum and maximum population change and the corresponding years
'''

# specify the file name
file = 'USPopulation.txt'

# empty list to contain the population from 1950 to 1990
population = []
# open the file
with open(file) as fp:
   # read the contents of the file into the list with each line being an element of the list
   contents = fp.readlines()
   fp.close() # close the file
   # loop over the contents list
   for line in contents:
       # strip is used to remove leading and trailing whitespace from line
       # int is used to convert string to integer and multiply the result by 1000
       population.append(int(line.strip())*1000)
  
   # initialize the variables for average, maximum and minimum
   total_population_change = 0
   min_population_change = -1
   max_popuation_change = -1
   min_pop_change_year = 0
   max_pop_change_year = 0
  
   # display the header
   print('%-10s%-15s%-15s%-s' %('Year','Population','Change','Percent Change'))
   year = 1950 # start year
   # loop over the population list
   for i in range(len(population)):
       # if first record
       if i==0:
           print('%-10d%-15d%-15s%-s' %(year,population[i],'N/A','N/A'))
       else: # for rest of the records
           change = population[i] - population[i-1] # calculate the change in population
           change_percent =float(change*100)/(population[i-1]) # calculate percent change
           # display the record
           print('%-10d%-15d%-15d%-.2f%-s' %(year,population[i],change,change_percent,'%'))
           total_population_change += change # add the change to total_population_change
           # determine if change is the minimum population change
           if min_population_change == -1 or min_population_change > change:
               min_population_change = change
               min_pop_change_year = year
           # determine if change is the maximum population change  
           if max_popuation_change == -1 or max_popuation_change < change:
               max_popuation_change = change
               max_pop_change_year = year
       year += 1      
  
   # calculate the average population change
   avg_change = float(total_population_change)/(len(population)-1)
   # display the average, minimum and maximum population change
   print('\nAverage Change = %.1f' %avg_change)
   print('Minimum Change = %d (%d)' %(min_population_change,min_pop_change_year))  
   print('Maximum Change = %d (%d)' %(max_popuation_change,max_pop_change_year))

#end of program  

Code Screenshot:

!יים loco VoWNE Python version: 3.6 Python program to read the text file containing US population from year 1950 to 1990 and calculate the change in population and its percent change and calculate the average population change, minimum and maximum population change and the corresponding years # specify the file name file = 'US Population.txt' 11 12 13 15 # empty list to contain the population from 1950 to 1990 population = [] # open the file Ewith open (file) as fp: # read the contents of the file into the list with each line being an element of the list contents = fp.readlines () fp.close() # close the file # loop over the contents list for line in contents: # strip is used to remove leading and trailing whitespace from line # int is used to convert string to integer and multiply the result by 1000 population.append(int (line.strip ())*1000) 18 19 # initialize the variables for average, maximum and minimum total population change = 0 min_population change = -1 max popuation change = -1 min_pop_change year = 0 max_pop_change year = 0

# initialize the variables for average, maximum and minimum total_population change = 0 min_population change = -1 max_popuation change = -1 min_pop_change_year = 0 max_pop_change_year = 0 NO www NEOCOWN OOOO OWNEO COUTWN POLO Unul # display the header print(" %-10%-15%-1558-5' $('Year', 'Population', 'Change', 'Percent Change')) year = 1950 # start year # loop over the population list for i in range (len (population)): # if first record if i==0: print('%-100%-150%-15%-5' $(year, population[i], 'N/A', 'N/A')) else: # for rest of the records change = population[i] - population[i-1] # calculate the change in population change_percent =float (change*100)/(population[i-1]) # calculate percent change # display the record print('%-100%-15%-15%-20%-' % (year, population[i], change, change_percent,'%')) total population change += change # add the change to total population change # determine if change is the minimum population change if min population change == -1 or min_population change > change: min population change = change min_pop_change_year = year # determine if change is the maximum population change if max_popuation change == -1 or max_popuation change < change: max_popuation_change = change max_pop_change_year = year year += 1 # calculate the average population change avg_change = float (total population change)/(len (population)-1) # display the average, minimum and maximum population change print("\nAverage Change = %.11' favg change) print('Minimum Change = %d (%)' $ (min population change,min_pop_change_year)) print('Maximum Change = %d (d)' $ (max popuation change,max_pop_change_year)) #end of program

Output:

Input file:

14 15 151868 153982 3 156393 158956 161884 | 165069 168088 8 171187 174149 10 | 177135 11 179979 12 182992 | 185771 188483 191141 16 193526 | 195576 | 197457 199399 20 201385 203984 22 206827 209284 24 211357 213342 26 215465 217563 219760 29 222095 224567 31 227225 32 229466 231664 34 233792 235825 36 237924 37 240133 38 | 242289 39 244499 40 246819 41 249623 21 23 30

Output: