How to set variable in Tkinter OptionMenu?

So my question is why the Tkinter OptionMenu is not setting to 4.5 as a default? Do I just have to put 4.5 at the beginning of the avgdisc_thresh list or am I doing something wrong?

OptionMenu

4.5

avgdisc_thresh

avgdisc_thresh = [3.5, 4, 4.5, 5, 5.5, 6] avgdisc_var = tk.StringVar() avgdisc_var.set("4.5") loss_option = ttk.OptionMenu( loss_top_win, avgdisc_var, *avgdisc_thresh) loss_option.grid( row=0, column=0)

Thanks!

In line 6, is ttk a typo? Do you mean tk.OptionMenu...?

– rcriii
Sep 9 '18 at 22:59

No. ttk has some more stylish menus, etc than tk. I use it wherever it works

– 6seven8
Sep 9 '18 at 23:15

Ahh. I see. they don't work together. had to use tk.. thanks!

– 6seven8
Sep 9 '18 at 23:16

1 Answer
1

With the ttk OptionMenu, the first value after the name of the variable is used as the default, which overrides whatever value you had previously set. The simple solution is to provide the default value when creating the widget.

OptionMenu

Example:

loss_option = ttk.OptionMenu(loss_top_win, avgdisc_var, "4.5", *avgdisc_thresh)

So either I use tk or change the format of my parameters? I had not realized ttk had a separate syntax

– 6seven8
Sep 9 '18 at 23:21

tk

ttk

I am trying to figure out why they would do this - it seems redundant to set a variable and then have the variable changed by the default value. Maybe you could help me understand?

– 6seven8
Sep 9 '18 at 23:25

@6seven8: not really. The Tkinter OptionMenu also takes the default value as the first parameter. In Tkinter it's a positional parameter, in ttk it's a keyword parameter.

– Bryan Oakley
Sep 9 '18 at 23:26

OptionMenu

Tkinter

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