Terry J. Reedy <tjre...@udel.edu> added the comment:

The current patch completes both strings keys and bytes keys mixed together.  I 
want to challenge this.

0. What is the use case?  The current patch nearly doubles the autocomple code, 
which handle user actions up to creation of a completion list.  I would prefer 
smaller.

1. We agreed on completing 'string keys'. Bytes are not strings.  Bytes might 
represent an encoded string, but might instead be anything else.  Some bytes 
are represented by ascii chars, but the majority need hex escapes.

2. Including bytes forces quoting keys in the list box in order to add the 'b' 
prefix for bytes.  I said above that we should quote anyway, but that was 
before working with the implementation and discovering the resulting usage 
issues.

3. Including bytes makes it harder to select a key by typing a partial key.  
Suppose d had hundreds of key, a to z.  One want to select 'zeta13  c3'.
>>> d[ <pause> opens a list box with starting with the 'a' words.
One enters 'z'.  Nothing happens because no entry starts with 'a'.
Backspace, enter "'z".  Nothings happens because the default quote used in the 
listbox is '"'.  If 'b' did not possibly represent a bytes prefix, we could 
either remove surrounding quotes or ignore them when matching.

----------
versions: +Python 3.10 -Python 3.7

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<https://bugs.python.org/issue21261>
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