bug#68559: [PATCH] Improve Python shell completion

[Eli Zaretskii]

> From: Liu Hui <liuhui1610@gmail.com>
> Date: Thu, 18 Jan 2024 12:48:37 +0800
> 
> Currently python-shell-completion-at-point doesn't respect the
> delimiter setting of readline completer and always split the text,
> resulting in poor completions when completers that don't need word
> splitting, e.g. jedi[1], is used. This patch fixes the problem.
> 
> Meanwhile, this patch adds an option 'python-shell-readline-completer'
> to make Python shell provide better completion experience (e.g.
> completing function parameters, dictionary keys) by default if users
> are using vanilla Python interpreter with jedi or using IPython, where
> the completion support for IPython has been enhanced (e.g. showing
> type annotations and function signatures).
> 
> BTW, I think it may make sense to move Python snippets to a separate
> file to make them easier to be maintained.

Thanks.  Let's see what others think about this (I don't use Python
enough to have an opinion that matters).