Tkinter menu item underline syntax [RESOLVED]

[Peter Otten]

On 06/01/2021 22:03, Rich Shepard wrote:
> On Thu, 7 Jan 2021, Chris Angelico wrote:
> 
>> Are you sure that this works? It's syntactically valid, but I don't
>> think it means what you think it does.
> 
> ChrisA,
> 
> I'm always open to learning. There's no error generated ... yet the
> application doesn' open so it's time to run it through pdb.

Spoiler: unless the name 'underline' is defined you get a NameError:

NameError: name 'underline' is not defined

If it is defined and self.callbacks is a dict you get a TypeError:

TypeError: unhashable type: 'slice'

because that's what a colon means in a context like

x[a:b]

 From what you posted I would guess that underline is most likely a 
keyword argument to the add_command() method:

file_menu.add_command(
     label='New',
     command=self.callbacks['file->new'],
     underline=0,
     accelerator='Ctrl+N'
)