Re: [Tutor] How to display radiobutton window with no buttons selected?
boB Stepp wrote:
> Win7-64bit, Python 3.6.1
>
> When I run the following code, the radiobutton window initially
> displays with *all* buttons apparently selected. However, when the
> "Status" button is clicked on, the status is as expected, an empty
> string for the checked_radiobutton StringVar().
>
>
> #!/usr/bin/env python3
>
> import tkinter as tk
>
> root = tk.Tk()
>
> # Report option selected:
> def status():
> print('You selected the radiobutton: %s' % checked_radiobutton.get())
> print()
>
> languages = ('Perl', 'JavaScript', 'PHP', 'Python 2', 'Python 3')
>
> # Create new variable object to keep track of checked radiobutton:
> checked_radiobutton = tk.StringVar()
>
> for language in languages:
> # Create new radiobutton:
> tk.Radiobutton(root, text=language, variable=checked_radiobutton,
> value=language).pack(anchor='w')
>
> checked_radiobutton.set('')
>
> tk.Button(root, text='Status', command=status).pack(fill='x')
>
> root.mainloop()
>
>
> I wish the displayed window to initially display with no button
> selected. What am I missing here?
It looks like the empty string is special. On my (linux) system all buttons
appear grayed (while a selected button would be black). Any other string
should give the desired result, probably because every button "thinks" that
another button is currently selected.
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Re: [Tutor] How to display radiobutton window with no buttons selected?
On Tue, Apr 25, 2017 at 2:01 AM, Peter Otten <__pete...@web.de> wrote:
> boB Stepp wrote:
>
>> Win7-64bit, Python 3.6.1
>>
>> When I run the following code, the radiobutton window initially
>> displays with *all* buttons apparently selected. However, when the
>> "Status" button is clicked on, the status is as expected, an empty
>> string for the checked_radiobutton StringVar().
>>
>>
>
>> #!/usr/bin/env python3
>>
>> import tkinter as tk
>>
>> root = tk.Tk()
>>
>> # Report option selected:
>> def status():
>> print('You selected the radiobutton: %s' % checked_radiobutton.get())
>> print()
>>
>> languages = ('Perl', 'JavaScript', 'PHP', 'Python 2', 'Python 3')
>>
>> # Create new variable object to keep track of checked radiobutton:
>> checked_radiobutton = tk.StringVar()
>>
>> for language in languages:
>> # Create new radiobutton:
>> tk.Radiobutton(root, text=language, variable=checked_radiobutton,
>> value=language).pack(anchor='w')
>>
>> checked_radiobutton.set('')
>>
>> tk.Button(root, text='Status', command=status).pack(fill='x')
>>
>> root.mainloop()
>>
>
>>
>> I wish the displayed window to initially display with no button
>> selected. What am I missing here?
>
> It looks like the empty string is special. On my (linux) system all buttons
> appear grayed (while a selected button would be black). Any other string
> should give the desired result, probably because every button "thinks" that
> another button is currently selected.
Interesting. What you suggest indeed works to create the display I
desired, no radiobuttons selected; however, it does have the undesired
side effect that the status() function reports that value. So it
looks like the best solution is to set checked_radiobutton to ' ', a
single space. It is still there in the status() printout, but it does
not look like anything is there. As this is a toy example, I am not
too concerned. In something I intended to use, I would probably be
setting a default value for one of the buttons anyway.
Thanks, Peter!
--
boB
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[Tutor] install dlib in window and run it with python
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Re: [Tutor] Tkinter layout question
On 24/04/17 23:40, Phil wrote: By the way, I notice that my messages to this list, > and not other's, can take up to four hours Your messages come into the moderation queue, I'm not sure why because the moderation flag is not set on your account(it is automatically for new members). I'll have a closer look next eek when I get back. Alan G ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: https://mail.python.org/mailman/listinfo/tutor
