CSV在写入和读取文件时出现问题

Question

所以我正在尝试创建一个CSV文件并允许它以特定方式读取并导回到程序中。它应该按字母顺序或数字，从最高到最低。 代码如下。已导入随机，时间和CSV。请忽略第2和第3类，因为它们尚未正确格式化。那么我怎么能让它从文件中取回来组织它？

import random
import time
import csv

Score = 0
CorrectAnswer = 0 
Op = ('X', '+', '-')
if CorrectAnswer == 0:
print("Hello! Welcome to the maths quiz. You will be asked 10     questions. They will be X, + or -.")
time.sleep (2)
Name = input(str("Before we start can you please put in your name?"))
Class = int(input('Also Which class are you in? 1, 2 or 3'))
print("Hello, get ready "+Name)

for loop in range(1):     
    Number_1 = random.randint(1,10)
    Number_2 = random.randint(1,10)
    MathsOp = str(random.choice(Op))
    print (Number_1, MathsOp, Number_2) 
    UserAnswer = input('So what is your answer?')

    if MathsOp == 'X':
        CorrectAnswer = (CorrectAnswer + Number_1 * Number_2)
        print (CorrectAnswer)
    if MathsOp == '-':
        CorrectAnswer = (CorrectAnswer + Number_1 - Number_2)
        print (CorrectAnswer)
    if MathsOp == '+':
        CorrectAnswer = (CorrectAnswer + Number_1 + Number_2)
        print (CorrectAnswer)    
    if int(UserAnswer) == CorrectAnswer:
        print ('Well Done! Next Question!')
        Score = (Score + 1)
        CorrectAnswer = 0 
    else:
        print ('Unlucky, better luck next time, Next Question!')
        CorrectAnswer = 0

print ('Well done', Name, '. You got ', Score) 

if Class == 1:
    PupilList = [(Name),(Score)]
    file = open('Class_1.csv', 'w')
    a = csv.writer(PupilList, delimiter='|', lineterminator='\n')
    a.writerows(PupilList)
    file.close()

if Class == 2:
    file = open('Class_2.csv', 'a')
    file.write((Name) + '|' + str(Score) + '\n')
    file.write('')
    file.close()

if Class == 3:
    file=open('Class_3.csv', 'a')
    file.write((Name) + '|' + str(Score) + '\n')
    file.write('')
    file.close()