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When running this little program, 0 for a sales amount should always deliver the error message. For some reason after I enter some other incorrect values and then try 0, the program allows it and completes. Must be something with the loop but I can't tell. Do I need to group the 2 "while"s together or what? Help please :)

Code:

#Define the main function

def main():

    # create a variable to control the loop

    keep_going = 'y'

    

    # create a counter for salesperson's

    number_of_salespersons = 0

    

    # process each salesperson's sales

    while keep_going == 'y' or keep_going == 'Y':



        # use a function to process each salesperson

        process_salesperson()



        number_of_salespersons += 1



        # are there more salesperson's?

        keep_going = raw_input('Are there more salespeople? (enter y for yes): ')



    # display the total number of salespeople

    print "There were", number_of_salespersons, "salesperson's."

    

    

    

def process_salesperson():

    # get the salesperson's name

    name = raw_input("What is the salesperson's name? ")



    # input the first sale amount

    print 'Enter', name + "'s first sale amount:",

    first_sale_amount = input()

    

    # validate the sale amount is  > $1 and < $25000

    while first_sale_amount < 1:

        print "ERROR: the sale amount must be between $1 and $25000."

        first_sale_amount = input("Please enter a correct sale amount: ")

        

    while first_sale_amount > 25000:

        print "ERROR: the sale amount must be between $1 and $25000."

        first_sale_amount = input("Please enter a correct sale amount: ")

        

    # intialize average, highest, and lowest sale amount

    total_sales = first_sale_amount

    highest_sale = first_sale_amount

    lowest_sale = first_sale_amount

    

    # get the number of sales for this person

    print 'How many sales did', name, 'have?',

    number_of_sales = input()

    

    for number in range(2, number_of_sales + 1):

        # get the sale amount

        print 'Enter', name + "'s amount for sale #" + str(number) + ':', 

        sale_amount = input()

        

        # validate the sale amount is  > $1 and < $25000

        while sale_amount < 1:

            print "ERROR: the sale amount must be between $1 and $25000."

            sale_amount = input("Please enter a correct sale amount: ")

        

        while sale_amount > 25000:

            print "ERROR: the sale amount must be between $1 and $25000."

            sale_amount = input("Please enter a correct sale amount: ")

            

        # accumulate the sales

        total_sales += sale_amount



        # check for highest sale

        if sale_amount > highest_sale:

            highest_sale = sale_amount



        # check for lowest sale

        elif sale_amount < lowest_sale:

            lowest_sale = sale_amount

            

    # compute average sale

    average_sale = float(total_sales) / number_of_sales

    

    # display the average, highest, and lowest sales

    print

    print name + "'s average sale was: \t $%6.2f" % average_sale

    print name + "'s highest sale was: \t $%6.2f" % highest_sale

    print name + "'s lowest sale was: \t $%6.2f" % lowest_sale

    print



# call the main function

main()