title: separate window in tkinter giving result
body: <p>I have been trying to make a simple calculator but I am struggling mainly with two things.</p>
  
  <ol>
  <li>Making a function that performs arithmetic equations in tkinter</li>
  <li>Showing the result in separate window</li>
  </ol>
  
  <p>I've attempted to show the results in a new window by using toplevel widget and showMessagebox but none of them works!</p>
  
  <p>Code:</p>
  
  <pre><code>from Tkinter import *
  import math
  import tkMessageBox
  
  class Calculator():
  
       def __init__(self,master):
  
            self.master = master
            self.master.configure(background='sky blue')
            self.master.geometry('650x420+350+225')
  
            self.master.title('Calculator')
  
            self.ini_velocity = DoubleVar()
  
            # here we start creating buttons and entry boxes
            self.m_label = Label(text='Calculator',fg = 'Navy', font=("Helvetica", 20,"bold italic"), bg='sky blue')
            self.m_label.pack()
  
            self.button1 = Button(self.master,text='Final velocity',fg='white',bg='dark green',bd =3, width=12, command= self.show_m)
            self.button1.place(x=52,y=155)
  
            self.label1=Label(self.master,text='''1. v = u + a*t
  
       Initial Velocity
  
       Acceleration
  
            Time ''', fg= 'Navy', font='Helvetica 10 bold',bg='sky blue')
            self.label1.place(x=0,y=30)
  
            self.e1= Entry(self.master, textvariable = self.ini_velocity, width=4,bd=2)
            self.e1.place(x=120, y=62)
  
            self.e2= Entry(self.master, width=4, bd=2)
            self.e2.place(x=120, y=92)
  
            self.e3=Entry(self.master, width=4,bd=2)
            self.e3.place(x=120, y=122)
  
       def my_calculation(self): # this function is to operate the calculation
            root2 = Toplevel(self.master)
            myGUI = result_window(root2)
  
       def my_quit(self):
            self.master.destroy()
  
       def myresault(self):
            self.a = self.ini_velocity.get()
  
  
  class result_window ():
       def __init__(self,master):
            self.master = master
            self.master.configure(background='sky blue')
            self.master.geometry('250x175+150+125')
            self.master.title('resault')
  
            print (Calculator.self.e1.get())
  
       def F_velocity(self):
            ini_v = self.ini_velocity.get()
            print (ini_v)
  
  
            # end of button commands
  def main():
  
       root = Tk()
       myGUIcalculator = Calculator(root)
       root.mainloop()
  
  if __name__=='__main__':
       main()
  </code></pre>