Hi Elefterios. I don't really work on PyPy, but I've written code that runs on PyPy and CPython 2&3 and Jython, unmodified. I tried IronPython too, but it was too different from the others.
On Sat, May 7, 2011 at 6:13 PM, Elefterios Stamatogiannakis < est...@gmail.com> wrote: > Hi all, and many many thanks for pypy. Your work on pypy is exceptional. > > Due to Roger Binns doing the first steps of porting APSW on top of pypy, > i've tried my project (madIS: http://code.google.com/p/madis ) with pypy > and head APSW, and found the following: > > In python 2.7.1: > In [1]: print dict.__setattr__ > <slot wrapper '__setattr__' of 'object' objects> > > In pypy 1.5: > In [10]: print dict.__setattr__ > <unbound method dict.__setattr__> > > In essence in python 2.7.1 dict.__setattr__ is the same as > object.__setattr__ whereas in pypy dict.__setattr__ works only with > dictionaries, so it throws the following error when called with an object: > > TypeError: unbound method __setattr__() must be called with dict > instance as first argument > > Above problem was solved by changing all dict.__setattr__ invocations > into object.__setattr__ invocations, and now the same code works in both > CPython and pypy. > Actually, this feels a bit like it was a portability issue in your code to me. Why should dict's __setattr__ apply to all objects? Doesn't it seem more natural that it would apply to dicts alone, and if it applies to more, that that's an implementation detail? > The second problem that i found with pypy is this: > > In [12]: import xml.etree.c > xml.etree.cElementTree > > Above is to show that cElementTree exists in pypy's xml.etree. If then i > try to import cElementTree: > > In [11]: import xml.etree.cElementTree > --------------------------------------------------------------------------- > ImportError Traceback (most recent call last) > > /home/estama/programs/pypy-15/bin/<ipython console> in <module>() > > /home/estama/programs/pypy-15/lib-python/2.7/xml/etree/cElementTree.pyc > in <module>() > 1 # Wrapper module for _elementtree > > 2 > ----> 3 from _elementtree import * > > ImportError: No module named _elementtree > > Thanks again for pypy, and to Roger Binns for your outstanding work on > APSW. > PyPy in general doesn't include a bunch of C extension modules; it's written in Python and RPython, so this seems somewhat natural. Your code probably should do something like: try: import xml.etree.cElementTree as element_tree except ImportError: import xml.etree.ElementTree as element_tree ...and then use element_tree.whatever in your code. It's 3 more lines, but more portable. HTH.
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