Program B.py The values in a dictionary can be Python lists . Code a dictionary

Question

Program B.py

The values in a dictionary can be Python lists. Code a dictionary named grades that uses a course name for each key and a list of test scores as the value for each key. For example, a course with key Psychology might have the list of test scores 88, 72, 94, 85 as its value. See also the output of Program C.py below. Your dictionary should consist of at least four courses, each with three to five test scores. When finished, serialize or pickle your dictionary object in a binary file. This program outputs only the message below to the screen.
OUTPUT
My semester grades were pickled.

Program C.py

This program should unpickle the binary file created by the program above and retrieve the dictionary. The dictionary should then be processed to display each course name and, on the same line, the test scores for each course and the average of these scores accurate to two decimal places. See sample output below. Strive to duplicate this output. Use a try block and except block as shown. You will need a counter and an accumulator to determine the averages. You can get it all done in the main function with two nested loops in the try block.
SAMPLE OUTPUT

My current classes and test grades are

Math test grades: 89 100 85 94               Average: 92.00 %

Science test grades: 97 56 73 90 79     Average: 79.00 %

Computer class test grades: 80 90 97     Average: 89.00 %

Morality test grades: 99 76 90 35            Average: 75.00 %

Explanation / Answer

I have put both the programs below:

Program B.py

import pickle

#A dictionary named grades

grades = {}

# Stuffing it with the data

grades["Math"] = [89, 100, 85, 94]

grades["Science"] = [97, 56, 73, 90, 79]

grades["Computer"] = [80, 90, 97]

grades["Morality"] = [99, 76, 90, 35]

#open a file, say grades.pickle in the write binary format,

#and dump the dictionary data in to it using pickle

with open('grades.pickle', 'wb') as f:

       pickle.dump(grades, f)

#print the output

print "My semester grades were pickled."

Program C.py

import pickle

#open the pickled binary file in the read binary format,

#and unpickle it using the load function of pickle

with open("grades.pickle", 'rb') as f:

       grades = pickle.load(f);

print "My current classes and test grades are"

#pick a course and its scores, find its average, and print them all

for (course, scores) in grades.iteritems():

       counter = 0 #to find no of scores

       accumulator = 0 #to find total score

       print course, "test grades:",

       for s in scores:

              print s,

              counter = counter + 1

              accumulator = accumulator + s

       print " Average:", format(accumulator/counter, '.2f'), "%"

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