Shell Programming and Scripting

from tkinter import *
from tkinter import ttk

def calculate(*args):
    A=str(a.get())  
    B=str(b.get()) 
    C=str(c.get())

    #out.set(A+" "+B+" "+C)





root = Tk()
root.title("Sample nruntest GUI")
mainframe = ttk.Frame(root)
mainframe.grid(column=0,row=1)
mainframe.columnconfigure(0,weight=1)
mainframe.rowconfigure(0,weight=1)
mainframe['relief'] = 'groove'
mainframe['padding'] = (5,5)
mainframe['borderwidth'] = 2
#
a=StringVar()
b=StringVar()
c=StringVar()
out=StringVar()
#
al=ttk.Label(root,text="A").grid(column=0,row=0,sticky=W)
bl=ttk.Label(root,text="B").grid(column=0,row=1,sticky=W)
cl=ttk.Label(root,text="C").grid(column=0,row=2,sticky=W)
out_l=ttk.Label(root,text="Out").grid(column=0,row=3,sticky=W)
ae=ttk.Entry(root,width=10,textvariable=a).grid(column=1,row=0,sticky=E)
be=ttk.Entry(root,width=10,textvariable=b).grid(column=1,row=1,sticky=E)
ce=ttk.Entry(root,width=10,textvariable=c).grid(column=1,row=2,sticky=E)
out_e=ttk.Entry(root,width=10,textvariable=out).grid(column=1,row=3,sticky=E)

button = ttk.Button(root,text="hello",command=calculate).grid(column=0,row=4)
root.mainloop()