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python - 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

问题描述

这就是我想要展示的。这些是两个功能的副产品。第一段是创建“grades.txt”文件的 create() 函数。我想我很容易就下来了。

其次，下一段来自“Retrieve()”函数，它从“grades.txt”文件中读取并显示类名和 GPA，然后计算这些类的平均值并显示它们。我觉得我正处于风口浪尖，但我坚持从这里去哪里，因为我受到“STRG”错误的困扰。

 >     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()

标签： pythonfile-ioaverage

解决方案

这就是我认为你想要做的。请仔细注意这与您所写的内容之间的差异。

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()

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