I'm trying to create a login system using a text file

Question

I'm trying to create a login system using a textfile so i've turned the text file into a list. When printed the textfile looks like this as i've split the rows:
[['11Ali15', '@Tyson345', 'Alice', '15', '11'], ['11Ell16', 'Nibbles', 'Ellen', '16', '11'], ['13Ell12', 'Asdan3', 'Ellie', '12', '13']]

This list is set out [Username,Password,Name,Age,Yeargroup] and i want to be able to make a log in system where username and password match so program can be continued.

The code i'm using at the moment is:(One of my subroutines)

print("--Login--")
username = input("Please enter your username:")
while len(username) == 0:
    username = input(" Please enter your username:")

password = input("Please enter your password:")
while len(password) == 0:
    password = input(" Please enter your password:")

studentlist = []
with open ("studentdetails.txt") as textfile:
    for row in textfile:
        row = row.strip ("\n")
        studentlist.append(row.split())
print (studentlist)

for everything in studentlist:       
    UserName = everything[0]
    PassWord = everything[1]

if username == UserName and password == PassWord:
    print("Logged on.")
    quizmenu()

But this doesn't work as it doesn't let u log in and goes round in a loop of asking username and password even when they're entered correctly.

Answer 1

Your indentation is off. It should be checking for Username and Password for each user in the text file, which would be like the following:

for everything in studentlist:       
    UserName = everything[0]
    PassWord = everything[1]

    if username == UserName and password == PassWord:
        print("Logged on.")
        quizmenu()

Answer 2

Suppose you have username and password data in test.txt file . You can use the below function to validate user account

def validateUserAccount():
    global index_num,userName,passWord,balances,username,password
    username=input("Enter your username : ")
    password=input("Enter your password : ")
    fileRead=open('test.txt','r')
    flag=False
    while True:
        line=fileRead.readline()
        lineLength=len(line)
        if lineLength==0:
            break
        lineItem=line.split()
        if username.strip()==lineItem[0] and password.strip()==lineItem[1] :
            print("Hello !",username," you have logged in successfully.")
            flag=True
            break
    if flag==False:
        print("The user is not found.Please re-enter your username and password.")
        validateUserAccount()