[sansnomme]

Microsoft Visual Studio level of Edit and Continue has never been well implemented in open source tooling (with the exception of certain Common Lisp implementations that predate even visual studio, I suspect Turbo Pascal might have this feature too but I have never really used it). This is why most people have to resort to hacks like notebooks and repls with bad UX that spend most of the time spewing errors at the user. It is starting to come back with Flutter, React, and all the livereload stuff but you need a ton of work to get it to work on Python.

See:

https://news.ycombinator.com/item?id=16289856

https://news.ycombinator.com/item?id=21646240

[pjmlp]

Turbo Pascal never had it, which barely mattered as it was already damm fast on a 4 Mhz MS-DOS PC.

Not sure about Delphi though.

However, I would also point to Java, Smalltalk, Eiffel as another set of examples.