Python-Lab:

print('Chapter 5: This program uses loops to analyze states and their populations

# This week you'll again be putting your code inside functions... this time, one # for each part of the assignment

def part1(): print(' Part 1 - use a loop to find the biggest state and population, compare to max()') # Using a loop, scan the entire list of populations to find the biggest. Then retrieve that state's name. # Print a line that indicates that state's name and its population. # Print also that result of the max() function on state_populations for comparison. # print out something like "The biggest state is x, with a population of y" # followed with something like "Using max() I get z, which should match" # insert your code next... just put your cursor at the end of this line and press Enter

def part2(): print(' Part 2 - use a loop to find all the states populations, compare to sum()') # Using a loop, scan the entire list to add up all the state populations. # Print also the value of the sum() function for comparison. # print something like "The total population of all the states is x" # followed with something like "Using sum() I get y, which should match" # insert your code next...

def part3(): print(' Part 3 - Where does Arizona rank?') # Use a loop to scan the list and determine where Arizona ranks in the pecking order by population. # print something like "Arizona ranks as the x th largest state in the nation" # Hint: review this week's Digging Deeper Additional Information for a review of rank. # insert your code next...

def part4(): print(' Part 4 - use a loop build a list and then print all the states containing a user supplied letter') # Input the user letter choice, using any non-letter entry to stop the loop # use something like user_input = input('Find all the states with letter (any non-letter will stop):') # Treat lower case and upper case as different letters. # Example: User requests lowercase p, result is Mississippi and New Hampshire. # Example: Uppercase P gives Pennsylvania. # Example: Lowercase g should return seven states, uppercase G returns only one. # If a valid letter is supplied, then gather into a list all the state names containing that letter. # Print the list. # If the list is empty, print something like "There were no states with that letter" and ask again. # Hint: an easy way to do the input is making a string of acceptable letters, something like # x = 'abcdef...zABC...Z' # then test if user_input is a member of that string. # insert your code next...

def part5(): print(' Part 5 - OPTIONAL Bonus Points - Biggest vs. the rest of the nation') # Use a loop to determine how many big states it takes to be half or more of the entire country's population # print something like # "The top x states, [list of those states], have a combined population of x, which is y % of the nation." # insert your code next...

# what follows are a few functions that help this program. # it's not dangerous to look down here... see if you can figure out what's going on

# what follows are a couple of functions that help this program. def get_all_states(): """Opens a .csv file and loads lists of state names and July 2019 population data The .csv file is assumed to have a header row, but we skip over it."""

infile = open(INPUT_FILE, 'r')

next(infile) # read and toss away the header which is the first line in the file

for line in infile: one_line = line.split(',') # obtain one line from the file, parse it using the commas state_names.append(one_line[0]) # append this name to the tail of the list x = int(one_line[1]) # convert the population string into integer state_populations.append(x) # and then append to the tail of the list, repeat the loop till EOF infile.close()

def print_all_states(): """Quick check that the data loaded properly""" print(' Our lists have', len(state_names), 'state names and', len(state_populations), 'populations.') print("state_names:", state_names) print() print("state_populations:", state_populations)

def goodbye(): print(" ***End of program***")

def main(): get_all_states() #this loads the two lists #print_all_states() # quick check to see that everything was loaded... uncomment this line to peek part1() # run each of the assignment parts part2() part3() part4() part5() goodbye()

# call main # ok, granted, the next two lines of code are odd... just consider it to be magic code at this point. # don't worry, all will be revealed in good time! Start a disussion thread or send me an email if you can't wait. if __name__ == '__main__': main()

Also here is the state population list that I am working with on this lab.

State Name	State Population
Ohio	11689100
Arkansas	3017825
Idaho	1792065
Connecticut	3565287
North Carolina	10488084
Virginia	8535519
West Virginia	1787147
Iowa	3155070
Wyoming	578759
Wisconsin	5822434
Pennsylvania	12801989
New Hampshire	1359711
Missouri	6137428
Oklahoma	3956971
Vermont	623989
Delaware	973764
California	39512223
Kansas	2913314
Alaska	731545
Michigan	9986857
New York	19453561
Texas	28995881
Illinois	12671821
South Dakota	884659
Nebraska	1934408
Utah	3205958
Minnesota	5639632
Louisiana	4648794
Arizona	7278717
Colorado	5758736
Tennessee	6833174
Maine	1344212
Alabama	4903185
New Jersey	8882190
Mississippi	2976149
Rhode Island	1059361
Hawaii	1415872
North Dakota	762062
Georgia	10617423
Washington	7614893
New Mexico	2096829
Oregon	4217737
South Carolina	5148714
Montana	1068778
Indiana	6732219
Nevada	3080156
Maryland	6045680
Florida	21477737
Massachusetts	6949503
Kentucky	4467673