Tkinter Radio button is being selected when hovered over

Question

I am having a weird issue with my radio buttons. When I run my program, they are initially unselected (as expected). However, if I mouse over one of them, they will select themselves, and this can allow both to be selected at the same time. This only seems to happen once per program execution, and manually selecting either of them will fix the issue, but I can't figure out why it's happening in the first place.

What makes this issue strange is, when I first wrote this code outside of a function it worked, so it seems the code being in a function might have something to do with it.

Any help appreciated.

def createPriceFrame(self):
    priceFrame = tk.Frame(self.parent, bg = 'lightgreen')
    priceFrame.place(relx = 0.5, rely = 0.45, relwidth = 0.35, relheight = 0.15, anchor='c')

    option = tk.IntVar()
    radioUnder = tk.Radiobutton(priceFrame, text = "Under", value = 1, var = option, bg = 'lightgreen', font = ('Arial', 12, 'bold'))
    radioUnder.grid(row = 1,  column = 0)

    radioOver = tk.Radiobutton(priceFrame, text =" Over", value = 2, var = option, bg = 'lightgreen', font = ('Arial', 12, 'bold'))
    radioOver.grid(row = 1,  column = 1)

It works when outside the function. You will have to provide the whole class/code. — Nouman, Aug 05 '19 at 09:16

score 1 · Answer 1 · answered May 19 '20 at 00:29

1

You need to declare your variable (option) as global - and yes, it's very strange. Unfortunately, I could not find the reason.

answered May 19 '20 at 00:29

JúliaMizarela

21
3

score 0 · Answer 2 · answered Nov 29 '22 at 13:45

The reason is that the variable option gets garbage-collected. You can avoid this by having a reference to the variable, e.g., by adding self.option = option.

This seems to be similar to the issue of adding images in tkinter, see, e.g., this and this.

Tkinter Radio button is being selected when hovered over

2 Answers2