Tkinter menu item underline syntax

[2QdxY4RzWzUUiLuE at potatochowder.com]

On 2021-01-06 at 10:32:58 -0800,
Rich Shepard <rshepard at appl-ecosys.com> wrote:

> My application's menu has lines like this:
>         file_menu.add_command(
>             label = 'New',
>             command = self.callbacks['file->new', underline 0],
>             accelerator = 'Ctrl+N'
>         )
> 
> Python reports a syntax error when specifying the string index to underline;
> it rejects both a space and an equals sign (=).

I'm not a TKinter expert (nor even a current user), but that line that
begins with whitespace and "command =" looks suspicious.  As far as I
can see, Python is correct to call it syntactically erroneous.

What is self.callbacks?  Is it a function, a list of functions, a list
of something else?

Did you possibly mean to use parentheses "(" and ")" instead of brackets
"[" and "]"?  Or perhaps some different punctuation between the "[" and
the "]"?

>From what I remember about TKinter, embedding Tcl/TK code inside strings
inside Python can be tricky (to say the least).

Sorry I don't have a concrete solution, just more to think about.