login = False
EnterUserName = input("Enter your username: ")
ValidUserName = False
ValidPassWord = False

file = open("LoginDetails.CSV","r")
for line in file:
    details = line.split(",")
    UserName = details[0]
    PassWord = details[1]

while ValidUserName == False:
    if EnterUserName == UserName:
        print("Username Correct! ")
        ValidUserName = True

    if ValidUserName != True:
        print("Incorrect Password - Try again!")
        ValidUserName = False

while ValidPassWord == False:
    if ValidUserName == True:
        EnterPassWord = input("Enter your password: ")
        if EnterPassWord == PassWord:
            print("Password Correct! ")
            ValidPassWord = True

        if ValidPassWord != True:
                print("Incorrect Password - Try again!")

if ValidUserName and ValidPassWord == True:
    print("=================")
    print("Login Successful!")
    print("=================")