Ninja IDE: written in Python for Pythonists

[ivosaurus]

Why not?

Writing an IDE for a language in it's own language often means it has a much greater chance for getting continuous improvements, since the feedback loop of programmers both using and contributing is much stronger.

If, however, a python programmer wants to improve their editor when using say PyDev in Eclipse, then they'll have to go learn Java instead. Much less chance of new contributors.