Question

I am making a Python GUI where the user types in int values into an Entry widget and then the program adds these values together.

However, for some reason whenever I try to tell the program to add these values it comes up with the error:

TypeError: unsupported operand type(s) for +: 'Entry' and 'Entry'"

I have looked around but can’t find anything on this topic. I have tried declaring the Entry widgets as ints and IntVars but it hasn’t worked so I’m wondering if it is actually possible to add up Entry values.

Answer 1

First you must get the string from the Entry and then convert it to an integer.

from Tkinter import *
root = Tk()

e1 = Entry(root)
e2 = Entry(root)
l = Label(root)
def callback():
    total = sum(int(e.get()) for e in (e1, e2))
    l.config(text="answer = %s" % total)
b = Button(root, text="add them", command=callback)
for widget in (e1, e2, l, b):
    widget.pack()
b.mainloop()