Question

To play the PowerBall lottery, you buy a ticket that has five unique numbers in the range of 1–69, and a “PowerBall” number in the range of 1–26. (You can pick the numbers yourself, or you can let the ticket machine randomly pick them for you.) Then, on a specified date, a winning set of numbers is randomly selected by a machine. If your first five numbers match the first five winning numbers in any order, and your PowerBall number matches the winning Pow-erBall number, then you win the jackpot, which is a very large amount of money. If your numbers match only some of the winning numbers, you win a lesser amount, depending on how many of the winning numbers you have matched. In the student sample programs for this book, you will find a file named pbnumbers.txt, containing the winning PowerBall numbers that were selected between February 3, 2010 and May 11, 2016 (the file contains 654 sets of winning numbers). Figure 8-6 shows an example of the first few lines of the file’s contents. Each line in the file contains the set of six numbers that were selected on a given date. The numbers are separated by a space, and the last number in each line is the PowerBall number for that day. For example, the first line in the file shows the numbers for February 3, 2010, which were 17, 22, 36, 37, 52, and the PowerBall number 24. Write a program that works with this file to display the 10 most common numbers, ordered by frequency.

Answer 1

Thanks for the question.
ere is the completed code for this problem. 

Comments are included, go through it, learn how things work and let me know if you have any doubts or if you need anything to change. 


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Thanks

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# file that needs to be read
filename = 'pbnumbers.txt'
# empty dictionary will contain number and its frequency, number is the lottery number
# which will act as the key while the vlaue will be the number of times the lottery
# number appeared in the file
number_dict = {}
# open the file in read mode
with open(filename, 'r') as infile:
    # read one line at a time
    for line in infile.readlines():
        # split the line by space
        line = line.strip().split()
       # pick the last 6 numbers which will be the lottery numbers
        numbers = line[-6:]
        # iterate over each number
        for number in numbers:
            # check if the number exist is in the dicitonary
            if number_dict.get(number) is None:
                # if its a new number add to the dictionary with count as 1
                number_dict[number] = 1
            else:
                # if the number already exist, increment the value by 1
                number_dict[number] += 1
    # sort the dictionary in reverse ordder that is number with highest frquency will apppear first
    number_list=sorted(number_dict.items(),key=lambda pair:pair[1],reverse=True)
    # slice the top 10 records
    top_10=number_list[:10]
    # print the numbers and its frequency
    print('{0:<10}{1:>10}'.format('Number','Frequency'))
    for data in top_10:
        print('{0:<10}{1:>10}'.format(data[0],data[1]))

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