Python - Tkinter - setting IntVar's in a list

Question

I've written an app that takes some data from the user, queries the API of a website, and returns and processes the data given by the API. I'm trying to allow the user greater control of what happens next by creating checkboxes for each item retrieved.

Because the number of items retrieved will vary on each use, I'm putting the checkboxes and the IntVars for if they're checked or not into lists. However, when I try to set the IntVars to 1 (so they all start out checked) I get a TypeError telling me it wants the IntVar instance as the first arg, but that doesn't make any sense to me as I'm trying to call a method for the IntVar in the first place.

This is a much simplified version of my code that generates an identical error:

import Tkinter as tk

class Application(tk.Frame):
    def __init__(self, master=None):
        tk.Frame.__init__(self, master)
        self.grid()

        self.test_names = ["Box 1", "Box 2", "Box 3", "Box 4"]
        self.boxes = []
        self.box_vars = []
        self.box_num = 0

        btn_test1 = tk.Button(self, text="Test 1", width = 11, command = self.test1)
        btn_test1.grid()

    def test1(self):
        for name in self.test_names:
            self.box_vars.append(tk.IntVar)
            self.boxes.append(tk.Checkbutton(self, text = name, variable = self.box_vars[self.box_num]))
            self.box_vars[self.box_num].set(1)
            self.boxes[self.box_num].grid(sticky = tk.W)
            self.box_num += 1

root = tk.Tk()
app = Application(master=root)
app.mainloop()

And the error message when pushing the button:

TypeError: unbound method set() must be called with IntVar instance as first
argument (got int instance instead)

What am I doing wrong?

How do we get the selected value from the checkboxes?, if say we have a submit button. — noswear
– noswear, Commented Sep 18, 2020 at 7:26

Eric Levieil · Accepted Answer · 2015-05-05 17:29:54Z

4

Classic problem. You add the type IntVar instead of adding an object of type IntVar. Add parentheses like this:

self.box_vars.append(tk.IntVar())

answered May 5, 2015 at 17:29

Eric Levieil

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1 Comment

Prodigal Over a year ago

Thank you! I feel a little dumb that it was something so simple. Learn something new every day.

Fame Castle · Accepted Answer · 2015-05-05 17:41:41Z

0

Yes you forgot the brackets. The result will be and not a tkinter intvar instance.

answered May 5, 2015 at 17:41

Fame Castle

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