The Python Morsels REPL (https://pym.dev/repl) now properly supports using Ctrl+D to stop standard input! A user recently tested out code that relied on sys.stdin.read() and ended up stuck without a way to send EOF.
Thanks @notsolonecoder for a 1.5 year old unmerged CPython PR that contained the keys to fixing this issue!
I've also thought of trying to at least make a better demo for folks that lives outside of CPython's repo. I'd be happy to collaborate on and/or beta test either/both of these things.
Completely separately: support for WebAssembly support for readline and curses one day would be incredible. Both are required for the brand new Python REPL in CPython's main branch, which I'm pretty sure means no new-style REPL in WASM land. This seems far less trivial though.
I'm not using pyodide because I don't want to allow arbitrary JS code execution. A pyodide dev told me that I could have put a wrapper/sandbox around pyodide to accomplish something similar as well.
@treyhunner@notsolonecoder my main concern with wasm stuff for python is long initial load times for first-time users -- the smallest pyodide packages i found back in the day were maybe ~10MB, which isn't huge but takes a few seconds for slower connections. if the package is only ~1MB then that could be very compelling. pandas tutor uses pyodide but has a few seconds of load time: https://pandastutor.com/
I understand the concern of load time. Since the running on Python Morsels is triggered by the user, the wasm file is often loaded by the time the user hits the run button and when it's not it typically only adds a couple seconds delay.
I'm hoping smart folks find a way to make the initial wasm file that's sent considerably smaller.
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