Program:

File name: “gpasort.py”

#Import required module

from gpa import Student

#Define the function make_Student()

def make_Student(info_Str):

    #Make multiple assignment

    Name, Hours, Gpoints = info_Str.split("\t")

    #Return constructor

    return Student(Name, Hours, Gpoints)

#Define the function read_Students()

def read_Students(file_name):

    #Open the input file for reading

    in_file = open(file_name, 'r')

    #Create an empty list

    Students = []

    #Create for loop to iterate over all lines in a file

    for line in in_file:

        #Append the line in a list

        Students.append(make_Student(line))

    #Close the input file

    in_file.close()

    #Return the list

    return Students

#Define the function write_Students()

def write_Students(Students, file_name):

    #Open output file to write

    out_file = open(file_name, 'w')

    #Create a for loop to iterate over list

    for s in Students:

        #Print output

        print("{0}\t{1}\t{2}".format(s.get_Name(), s.get_Hours(), s.getQ_Points()), file = out_file)

    #Close the output file

    out_file.close()

#Define the main() function

def main():

    #Print the string

    print("This program sorts student grade information by GPA, name, or credits.")

    #Get the input file

    file_name = 'gpa1.txt'

    #Assign the data return from read_Students()

    data = read_Students(file_name)

    #Create "while" loop

    while True:

        #Get the type

        x = (input('Type "GPA", "name", or "credits" >>>  '))

        #Get the type of ordering

        m = (input('Type "A" for ascending, "D" for descending.'))

        #Check whether the type is "GPA"

        if x == 'GPA':

            #Sort the data based on the gpa

            data.sort(key=Student.gpa)

            #Rename the file name

            s = "_(GPA)"

            #Check whether the ordering is "D"

            if m == "D":

                #Reverse the data

                data.reverse()

            #Use break to exit

            break

        #Check whether the type is "name"

        elif x == 'name':

            #Sort the data based on the name

            data.sort(key=Student.get_Name)

            #Rename the file name

            s = "_(name)"

            #Check whether the ordering is "D"

            if m == "D":

                #Reverse the data

                data.reverse()

            #Use break to exit

            break

        #Check whether the type is "credits"

        elif x == 'credits':

            #Sort the data based on the credits

            data.sort(key=Student.getQ_Points)

            #Rename the file name

            s = "_(credits)"

            #Check whether the ordering is "D"

            if m == "D":

                #Reverse the data

                data.reverse()

            #Use break to exit

            break

        #Otherwise

        else:

            #Print the string

            print("Please try again.")

    #Assign the output file

    filename = "GPA2" + s + ".py"

    #Write the data into output file

    write_Students(data, filename)

    #Print output file

    print("The data has been written to", filename)

#Call the main function

if __name__ == '__main__': main()

File name: “gpa.py”

#Create a class Student

class Student:

    #Define _init_() method

    def __init__(self, Name, Hours, Gpoints):

        self.Name = Name

        self.Hours = float(Hours)

        self.Gpoints = float(Gpoints)

    #Define get_Name() method

    def get_Name(self):

        #Return the name

        return self.Name

    #Define get_Hours()

    def get_Hours(self):

        #return hours

        return self.Hours

    #Define getQ_Points()

    def getQ_Points(self):

        #return grade points

        return self.Gpoints

    #Define the funcition gpa()

    def gpa(self):

        #return the value

        return self.Gpoints / self.Hours

#Define the function make_Student()

def make_Student(info_Str):

    #Make multiple assignment

    Name, Hours, Gpoints = info_Str.split("\t")

   #Return the constructor

    return Student(Name, Hours, Gpoints)

#Define the main() function

def main():

    #Open the input file for reading

    file_name = input("Enter the name of the grade file: ")

    in_file = open(file_name, 'r')

    #Set best to the record for the first student in the file

    best = make_Student(in_file.readline())

    #Process lines of the file using "for" loop

    for line in in_file:

        #Make the line of file into a student record

        s = make_Student(line)

        #Checck whether the student is best so far

        if s.gpa() > best.gpa():

            #Assign the best student record

            best = s

    #Close the input file

    in_file.close()

    #Print information about the best student

    print("The best student is:", best.get_Name())

    print("Hours:", best.get_Hours())

    print("GPA:", best.gpa())

if __name__ == '__main__':

    #Call the main() function

    main()