Hi,

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.

Best,

[1] https://jedi.readthedocs.io/en/latest/docs/usage.html#repl-completion