Use colors in tab-completion in PyREPL

[ambv]

The current tab-completer is somewhat basic. There's a pyrepl-based library called fancycompleter that allows for context-aware colorful tab completions. Much more useful and looks better.

Linked PRs

• gh-130472: Integrate fancycompleter with the new repl, to get colored tab completions #130473

[gaogaotiantian]

I actually have a question about the overall color-related features - how many colors can we use at this point, and how should we use them? If I remember correctly, it took a while to land on this magenda color for some stuff, and we are planning to add much more colors for completion? How much we need to think about for color-blindness or different terminal backgrounds to use new colors? I always have this question because pdb could really use some colors, but it doesn't seem like we have a consensus about how we can use them.

[ambv]

@gaogaotiantian the plan is to add theming support in PYTHONSTARTUP. I'll be working on this in March.

[gaogaotiantian]

Got it, thanks!