GUI Login

#filename : login.py
#python version : 3.6.2

from tkinter import *
from tkinter import ttk
import sqlite3
import hashlib
import os
import time

LFont=("Verdana", 12)
MFont=("Verdana", 10)
SFont=("Verdana", 8)

class GUILogin(Tk):

    def __init__(self, *args, **kwargs):
        Tk.__init__(self, *args, **kwargs)

        utama = Frame(self)
        utama.pack(side=TOP, fill=BOTH, expand=True)



        self.frames = {}

        for F in (LoginPage, RegisterPage):

            frame = F(utama, self)

            self.frames[F] = frame

            frame.grid(row=0, column=0, sticky=NSEW)

        self.show_frame(LoginPage)

    def show_frame(self, cont):
        frame = self.frames[cont]
        frame.tkraise()

    def Login(self):

        username = nameL.get()
        password = passL.get()

        c.execute('SELECT * FROM passwords WHERE username = ? AND password = ?', (username, hasher(password)))

        if c.fetchone() is not None:
            print("\n [+] Logged In.\n\nWelcome {}\n".format(username))

        else:
            print("\n [!] Invalid Login.\n")
            time.sleep(1.5)
            self.show_frame(LoginPage)

    def Register(self):

        username = nameE.get()
        password = passE.get()

        c.execute("INSERT INTO passwords VALUES('{}', '{}')".format(username, hasher(password)))
        con.commit()

        self.show_frame(LoginPage)


    def hasher(self, string):
        return hashlib.sha1(string.encode()).hexdigest()

    def makeDB(self):
        global con
        global c
        con = sqlite3.connect(DB)
        c = con.cursor()

        c.execute("CREATE TABLE IF NOT EXISTS passwords(username TEXT, password TEXT")

        return c


class LoginPage(Frame):

    def __init__(self, parent, controller):
        Frame.__init__(self, parent)

        intro = Label(self, text="Login GUI", font=LFont)
        intro.grid()

        nameL = Label(self, text="Username: ", font=SFont)
        passL = Label(self, text="Password : ", font=SFont)
        nameL.grid(row=1, sticky=W)
        passL.grid(row=2, sticky=W)

        nameE = ttk.Entry(self)
        passE = ttk.Entry(self, show="*")
        nameE.grid(row=1, column=1)
        passE.grid(row=2, column=1)

        button = ttk.Button(self, text="Login", command=lambda: GUILogin.Login)
        button.grid(row=3)

        button1 = ttk.Button(self, text="Register", command=lambda:controller.show_frame(RegisterPage))
        button1.grid(row=3, column=1)



class RegisterPage(Frame):

    def __init__(self, parent, controller):
        Frame.__init__(self, parent)

        intro = Label(self, text="Register", font=LFont)
        intro.grid()

        nameL = Label(self, text="Username: ", font=SFont)
        passL = Label(self, text="Password: ", font=SFont)
        nameL.grid(row=1, sticky=W)
        passL.grid(row=2, sticky=W)

        nameE = Entry(self)
        passE = Entry(self, show="*")
        nameE.grid(row=1, column=1)
        passE.grid(row=2, column=1)

        button= ttk.Button(self, text="Register", command=GUILogin.Register)
        button.grid(row=3)

        button1 = ttk.Button(self, text="Cancel", command=lambda: controller.show_frame(LoginPage))
        button1.grid(row=3, column=1)


app = GUILogin()
app.title('Login')
app.geometry('300x150')
app.mainloop()