import tkinter
from tkinter import *
from tkinter import ttk
def checkusername(user_name):
    for line in open("accountfile.txt", "r").readlines():  # Read the lines
        login_info = line.split()  # Split on the space, and store the results in a list of two strings
        if user_name == login_info[0]:
            print("Correct credentials!")
            return False
def register():
    file = open("accountfile.txt", "a")
    username = input("Enter User Name:")
    print(checkusername(username))
    while (checkusername(username) == False):
        username = input("Already exisit, Enter User Name:")

    file.write(username)
    file.write(" ")
    password = input("Enter Password: ")
    file.write(password)
    file.write("\n")
    file.close()
    if login():
        print("You are now logged in...")
    else:
        print("You aren't logged in!")


def login():
    username = input("Please enter your username")
    password = input("Please enter your password")
    for line in open("accountfile.txt", "r").readlines():  # Read the lines
        login_info = line.split()  # Split on the space, and store the results in a list of two strings
        if username == login_info[0] and password == login_info[1]:
            print("Correct credentials!")
            return True
    print("Incorrect credentials.")
    return False

register()