formatting

import Tkinter as tk # python 2
import tkFont as tkfont # python 2


class Store(tk.Tk):
    def __init__(self, *args, **kwargs):
        tk.Tk.__init__(self, *args, **kwargs)
        self.title_font = tkfont.Font(family='Helvetica', size=18, weight="bold", slant="italic")
        self.username = tk.StringVar()
        container = tk.Frame(self)
        container.pack(side="top", fill="both", expand=True)
        container.grid_rowconfigure(0, weight=1)
        container.grid_columnconfigure(0, weight=1)
        self.frames = {}
        for F in (StartPage, Signup, DoSignup, Login):
            page_name = F.__name__
        frame = F(parent=container, controller=self)
        self.frames[page_name] = frame
        frame.grid(row=0, column=0, sticky="nsew")
        self.show_frame("StartPage")
    def show_frame(self, page_name):
        '''Show a frame for the given page name'''
        frame = self.frames[page_name]
        frame.tkraise()


class StartPage(tk.Frame):
    def __init__(self, parent, controller):
        tk.Frame.__init__(self, parent)
        self.controller = controller
        #self.username = tk.StringVar()
        #self.username.set("")
        lblUsername = tk.Label(self, text="Username", font=("Courier", 15, "bold"))
        #entryUsername = tk.Entry(self, textvariable=self.username)
        lblPassword = tk.Label(self, text="Password", font=("Courier", 15, "bold"))
        self.password = tk.StringVar()
        self.password.set("")
        entryPassword = tk.Entry(self, textvariable=self.password, show="*")
        buttonLogin = tk.Button(self, text="Login",command=lambda: controller.show_frame("Login"))
        buttonSignUp = tk.Button(self, text="Signup",command=lambda: controller.show_frame("Signup"))
        lblUsername.pack()
        #entryUsername.pack()
        lblPassword.pack()
        entryPassword.pack()
        buttonLogin.pack()
        buttonSignUp.pack()


class Signup(tk.Frame):
    def __init__(self, parent, controller):
        tk.Frame.__init__(self, parent)
        self.controller = controller
        Signup.username = tk.StringVar()
        Signup.username.set("")
        lblUsername = tk.Label(self, text="Username", font=("Courier", 15, "bold"))
        entryUsername = tk.Entry(self, textvariable=Signup.username)
        self.password = tk.StringVar()
        self.password.set("")
        lblPassword = tk.Label(self, text="Password", font=("Courier", 15, "bold"))
        entryPassword = tk.Entry(self, textvariable=self.password, show="*")
        lblEmail = tk.Label(self, text="Email", font=("Courier", 15, "bold"))
        self.email = tk.StringVar()
        self.email.set("")
        entryEmail = tk.Entry(self, textvariable=self.email)
        lblFullName = tk.Label(self, text="Full Name", font=("Courier", 15, "bold"))
        self.fullName = tk.StringVar()
        self.fullName.set("")
        entryFullName = tk.Entry(self, textvariable=self.fullName)
        buttonSignUp = tk.Button(self, text="Signup",command=self.test)
        buttonBack = tk.Button(self, text="Back to startpage",command=lambda: controller.show_frame("StartPage"))
        lblUsername.pack()
        entryUsername.pack()
        lblPassword.pack()
        entryPassword.pack()
        lblEmail.pack()
        entryEmail.pack()
        lblFullName.pack()
        entryFullName.pack()
        buttonSignUp.pack()
        buttonBack.pack()
    def test(self):
        Signup.username.set("Sugeng")
        return Signup.username.get()
        self.controller.show_frame("DoSignup")


class DoSignup(tk.Frame):
    def __init__(self, parent, controller,):
        tk.Frame.__init__(self, parent)
        self.controller = controller
        print(Signup.username)
        a= Signup.username.get()
        lblUsername = tk.Label(self, text=a, font=("Courier", 15, "bold"))
        lblUsername.pack()

class Login(tk.Frame):
    def __init__(self, parent, controller):
        tk.Frame.__init__(self, parent)
        self.controller = controller

if __name__ == "__main__":
    app = Store()
    app.mainloop()