Hello ! Here is at least a quick overview of the sprint changes... * Holger already talked about the big change, which was to use CPython's descriptor model as the object model. Now all classes, built-in or not, have a bunch of __xxx__ methods and properties, and the operations themselves (e.g. space.add()) are no longer multimethods but calls to these special methods, using CPython's rules, which you can see in objspace/descroperation.py. For example, space.add(w1,w2) works by looking up __add__ on the type of w1 and then __radd__ on the type of w2. This means that there isn't a lot of difference any more between built-in and user-defined classes, which is good. Note that multimethods are still used to populate the built-in classes, e.g. int.__add__() is created as a function object that dispatches to one of the add__Int_Xxx() functions. So basically every complex meta-class magic works just fine in PyPy now :-) Credits in alphabetical order: Holger, me, Michael, Samuele. * Samuele and Alex (and Holger on tests) implemented the package import system. * On the translator side, Anders and myself worked on code generation: it can produce things like classes with methods on them. Then Anders cleaned it up a lot and refactored the corresponding files and tests. Holger helped here too. * Anna worked on documentation. * We considered the unittest-to-utest switch a couple of time. utest seems ready now. At the end of the second week Laura and Jacob started working on an automatic translation tool for all our test_*.py files. Laura seems to have almost finished it by now. * Michael and Holger have put an (optional) HTTP server in PyPy, to handle these long tracebacks in a browser. I think it is still waiting for improvement. * A lot of small things went fixed all along the sprint, notaby by trying to run PyPy on top of itself. * Holger moved 'class complex' into __builtin__module.py. * Alex, Holger, Michael: String formatting ( % ) is done by PyPy now; I think it's not entierely complete yet. * Laura worked a bit more on her tool to figure out what exactly is missing but present in CPython. * We now have real CPython-ish hash-tables as dictionaries. Thanks Michael. * A nice feature (XXX mention it somewhere) is that on the PyPy prompt, Ctrl-C sends you to a CPython prompt in which you can play with PyPy at interp-level. All app-level names 'x' are available under 'w_x' names, i.e. the same name with a 'w_' prefix, and of course there is a 'space'. * Holger, Michael: operator module in pure Python. [However, Michael, let me point out that 'operator.add(2,3)' fails currently -- all of them do. staticmethods are not callable.] Sorry if I missed something above the "detail" level, or someone's due credits. This list was built by scanning through the svn checkin messages. A bientôt, Armin.