Terry J. Reedy added the comment:

Reading the Tk Wiki page, it appears that Shift undoes ShiftLock except on Mac, 
where it does nothing. So there is effectively only ^a and ^A, etc.

Looking as the Get New Keys dialog, the Basic Key Binding Entry pane says "New 
keys .." plural, but as far as I can tell, only one new key can be entered. 
Moreover, Control-Key-a and Control-Shift-Key-A are possible, but not 
Control-Key-A. The latter is only possible with hand entry in the Advanced Key 
Binding Entry pane. This might be why some functions have a single key binding 
and some both. Perhaps the dialog should auto-augment Control-Key-x with 
Control-Key-X, where x is a lowercase letter.

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue12387>
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