lab1.py

import csv
import sys
import random

from collections import defaultdict

#make a function




Name = list()
userID = list()
UserPassword = list()
with open( 'marks_test.csv', newline='\n') as csvfile:
    reader = csv.reader( csvfile ) 
    for row in reader :
        Name.append(row[0])
        userID.append( row[1] )
        UserPassword.append( row[2] )



def check_User_Info(user_input1, user_input2):


    for member_index in range( len(userID)):
        member_userID = userID[ member_index ]
        member_userPassword = UserPassword[ member_index ]
        member_name = Name[ member_index ]
        
            
        for elem in userID:
            if user_input1 == elem:
                print("Correct UserID.")
                member_index = userID.index(user_input1)
                
                if user_input2 == UserPassword[ member_index ]:
                    print("welcome!")
                    return True
                else:
                    print("your password or UserID is not valid, please try again")
                    return False
while True:
    user_input1 = input("Please enter userID:")
    user_input2 = input("Please enter your password")
    y = check_User_Info(user_input1, user_input2)
    if y == True:
        break
    else:
        print("your password or UserID is not valid, please try again")
        
        continue
    

                

                

check_User_Info(user_input1, user_input2)