[fish2000]

Python's API structure may be fast and loose, but that is a feature, I think. Its type system may have some threadbare implementation spots – the _sre example from the standard library, for instance – but there are some compelling examples as well.

I, for one, have been working on an app implemented mostly with PyObjC, the bridge between Python and Objective-C. I had all but written off PyObjC as a bizarre yet unuseful language mule... but lately I had the occasion to read through the PyObjC source code base, in service of my project. Did you know that when you subclass a wrapped Objective-C type in Python, an all-new Objective-C class is created and wrapped as the descendant class, behind the scenes? That blew my mind.

That happens transparently, in concordance with Python's type heiarchy and runtime ABI. As it turns out, PyObjC predates Mac OS X, and the authors have put a lot of work into mitigating things like the GIL and system events.

I am also a fan of Django's field type system, as the author mentioned – and I am curious about what he thinks about descriptors (which he mentioned one but did not address) – I think descriptors are an amazing addition to the duck-typing regime in Pythonville.