python Tkinter get() value from Entry Field

Question

I have getting confused in getting the value from the Tkinter() Entry Field. I have this kind of code...

from Tkinter import*

def valueGET(val1, val2):
             


        

Answer 1

from tkinter import *
import tkinter as tk
root =tk.Tk()
mystring =tk.StringVar(root)
def getvalue():
    print(mystring.get())
e1 = Entry(root,textvariable = mystring,width=100,fg="blue",bd=3,selectbackground='violet').pack()
button1 = tk.Button(root, 
                text='Submit', 
                fg='White', 
                bg= 'dark green',height = 1, width = 10,command=getvalue).pack()

root.mainloop()

Answer 2

you need brackets in the print command in your function

def valueGET(val1, val2):
    print val1 + "  " + val2

Answer 3

The code call valueGET even before submit button is created. Then it pass the return value of the function to Button constructor as command argument.

To register the function as callback, replace folloiwng line:

submit = Button(frame, text="Enter", width=15, command=valueGET(E1.get(), E2.get())) 

with:

submit = Button(frame, text="Enter", width=15, command=lambda: valueGET(E1.get(), E2.get()))