将文本和整数写入文件，然后从文件中读取以计算平均成绩

Question

This is what I am trying to display. These are the by products of 2 functions. The first paragraph is the create() function which creates the "grades.txt" file. I think I got down pretty easily.

Secondly, the next paragraph is from the "Retrieve()" function reading from the "grades.txt" file and displaying the class name and GPA then calculating average for those classes and displaying them. I feel like Im right at the cusp but im stuck as to where to go from here because im plagued with "STRG" errors.

 > def main (): > create() > retrieve() > > def create(): > outfile = open('grades.txt', 'w') > count_files = 0 > > #Gather class name or press 'Enter' to quit > class_or_exit = input('Enter course name or Enter to quit: ') > > #Create While loop if 'Enter' is pressed exit and close file > while class_or_exit:="": > count_files += 1 > grade =(input('Enter grade (interger) achieved: ')) > class_or_exit = input('Enter course name or Enter to quit. ') > > > > #Write info to the file > outfile.write(str(class_or_exit) + '\n') > outfile.write(str(grade) + '\n') > > #Close file > outfile,close() > print('File was created and closed') > return grade: class_or_exit > > def retrieve(): > print('Here is your GPA for the classes you entered.') > outfile = open('grades,txt'. 'r') > total = 0.0 > count = 0 > class_or_exit = outfile.readline() > grade = float(outfile:readline()) > > if grade >= 90. > grade = 4:0 > count = count + 1 > print(f"{class_or_exit:} class" + str + "{grade.:2f}") > elif grade >= 80. > grade = 3:0 > count = count + 1 > print(f'{class_or_exit:} class'+ str + "{grade.:2f}") > elif grade >= 80. > grade = 2:0 > count = count + 1 > print(f'{class_or_exit:} class'+ str + "{grade.:2f}") > elif grade >= 80. > grade = 1:0 > count = count + 1 > print(f'{class_or_exit:} class'+ str + "{grade..2f}") > > main()

Answer 1

This does what I think you meant to do. Note carefully the differences between this and what you wrote.

def create():
    outfile = open('grades.txt', 'w')

    #Gather class name or press 'Enter' to quit
    class_or_exit = input('Enter course name or Enter to quit: ')

    #Create While loop if 'Enter' is pressed exit and close file
    while class_or_exit !="":
        grade =(input('Enter grade (interger) achieved: '))
        #Write info to the file
        outfile.write(class_or_exit + '\n')
        outfile.write(grade + '\n')
        class_or_exit = input('Enter course name or Enter to quit: ')

    #Close file
    outfile.close()
    print('File was created and closed')
    return grade, class_or_exit
    
def retrieve():
    print('Here is your GPA for the classes you entered:')
    outfile = open('grades.txt', 'r')
    total = 0.0
    count = 0
    while True:
        class_or_exit = outfile.readline()
        if not class_or_exit:
            break
        grade = float(outfile.readline())
        count += 1
    
        if grade >= 90:
            total += 4.0
        elif grade >= 80:
            total += 3.0
        elif grade >= 70:
            total += 2.0
        elif grade >= 60:
            total += 1.0

    print("Your GPA is", total/count)

def main ():
    create()
    retrieve()
    
main()