Thanks for the report. This is another issue we've already fixed for beta 6 - inheriting from a mix of new-style classes as well as old-style classes.
This was part of a large cleanup around __metaclass__ defined at the module scope, support for __metaclass__ being a function, support for __mro__ on new-style classes, and some random other fixes for more CPython compatibility. So you should be seeing this fix real soon now. Do you want to help develop Dynamic languages on CLR? (http://members.microsoft.com/careers/search/details.aspx?JobID=6D4754DE-11F0-45DF-8B78-DC1B43134038) -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Sanghyeon Seo Sent: Thursday, April 20, 2006 12:04 AM To: Discussion of IronPython Subject: [IronPython] Multiple-inheritance with builtin types Example code: class CompatMixin: def __getattr__(self, attr): if attr == 'string': return self else: raise AttributeError, attr class CompatString(str, CompatMixin): pass s = CompatString('abc') print s print s.string s.error The intent is to provide backward-compatibility with previous API, so that using the string as s and s.string both work. Above code was modelled after similar code in BeautifulSoup, a popular Python library. IronPython says: NotImplementedError: CompatString: unsupported base type for new-style class: IronPython.Runtime.ExtensibleString Seo Sanghyeon _______________________________________________ users mailing list users@lists.ironpython.com http://lists.ironpython.com/listinfo.cgi/users-ironpython.com _______________________________________________ users mailing list users@lists.ironpython.com http://lists.ironpython.com/listinfo.cgi/users-ironpython.com
