Serhiy Storchaka added the comment:
Now it is clear that '`' is bad prefix.
There are 32 non-alphanumerical non-control ASCII characters: '!', '"', '#',
'$', '%', '&', "'", '(', ')', '*', '+', ',', '-', '.', '/', ':', ';', '<', '=',
'>', '?', '@', '[', '\\', ']', '^', '_', '`', '{', '|', '}', '~'.
'{', '}', '"', '[', ']', '$', '\\' is basic part of Tcl syntax.
'(' and ')' are used in array indexing.
';' is command delimiter. '#' is a commenting command (and what is more
important, it is widely used in generated by Tk widget names).
'.' is component delimiter in widget names.
'-' starts an option.
'%' starts a substitution in callbacks.
'?' and '*' are used in patterns.
"'", ',', and '`' look like grit on my screen.
What is left? '!', '&', '+', '/', ':', '<', '=', '>', '@', '^', '_', '|', '~'.
'@' starts coordinates or image path in some commands.
'~' is expanded to home directory in paths.
'!' is used for comments in X resources.
'|' looks too distant from preceding dot and following name.
Not all of these arguments are absolute stoppers. Personally I like '!', '?'
and '@'. Unlikely generated names are saved in X resources or searched by
patterns. If you need the widget being named, you just specify a name instead
of allowing Tkinter generate arbitrary one.
What are your preferences Terry?
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