def login():
file=open("user.txt","r")
user=input("enter usename")
password=input("enter password")
Check=False
for line in file:
    correct=line.split(":")
    if user==correct[0] and password==correct[1]:
        Check=True
        break
if Check==True:
    print("succesffuly logged in")
    file.close()
    mainMenu()
else:
    print("incorrect log in")
    file.close()
    login()

for line in file:
    correct=line.split(":")

for line in file:
    correct=line.strip().split(":")

def login():
    file = open("user.txt", "r")
    user = input("enter usename ")
    password = input("enter password ")
    if ('{0}:{1}'.format(user, password)) in file:
        print('yay')
    else:
        print('Boo !! User not found')

login()

def login():
    file = open("user.txt", "r")
    user = input("enter usename ")
    password = input("enter password ")
    for line in file:
        temp_user, temp_password = line.strip().split(':')
        if temp_user == user and temp_password == password.strip():
            print('yay')
        else:
            print('boo username and password not found!')


login()