I do often break into a REPL on a python exception; but I mostly use that to diagnose the problem and restart from scratch, rather than actually editing the cod

I do often break into a REPL on a python exception; but I mostly use that to diagnose the problem and restart from scratch, rather than actually editing the code inside the REPL. This is probably because I don't have the setup required to persist the changes back down to the source file, even when that source file is different from the one actually loaded (eg in my development folder rather than the installed site-packages version.)