Unable to return value from callback function of a button in Python Tkinter

[nilaybnrj]

Hi Team

I am trying to get the input written in an Entry box using Tkinter, But whenever I am trying to do so I am not getting the desired result..Instead a None is getting returned. Please help My code is given below

from Tkinter import *

class menu:
    def __init__(self,master):
        self.master=master
        self.var1 = StringVar()
        self.entry = Entry(self.master,textvariable=self.var1)
        self.entry.pack(side=TOP)
        self.var2 = StringVar()
        self.value=self.get_value()
        self.button = Button(self.master,text='Hit Me',command = self.get_value)
        self.button.pack(side=TOP)

    def get_value(self):
         self.value= self.var1.get()

if __name__=="__main__":
    root = Tk()
    Menu = menu(root)
    print Menu.value
    root.mainloop()

Output:
None

in this while printing Menu.value I am getting None instead off getting what I entered into Entry.Please help.Thanks in advance.