reading function from another file into a button in python

Question

I'm making a main code in Python 3.6 called gui_check.py.

The code looks like this:

from tkinter import *
from urlread import givenumbers

top = Tk()
top.geometry("400x400")

B = Button(top, text = "Hello", command = givenumbers())
B.place(x = 50,y = 50)

top.mainloop()

In this code, there is a function called givenumbers() which is a function from another file (called urlread.py) that prints numbers.

The result I wanted to get is a gui with a button that when I click on it, it calls the function givenumber(). However, the result I get is that when I run the code it runs givenumber() (print the numbers) while opening the gui even without me clicking on the button.

Possible duplicate of Why is Button parameter “command” executed when declared? — j_4321
– j_4321, Commented Feb 3, 2017 at 17:57

Leonid · Accepted Answer · 2017-02-03 17:57:20Z

2

Remove the parentheses in:

B = Button(top, text = "Hello", command = givenumbers())

So you should have:

B = Button(top, text = "Hello", command = givenumbers)

instead.

Read http://effbot.org/zone/tkinter-callbacks.htm

answered Feb 3, 2017 at 17:57

Leonid

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