On Thu, May 04, 2006 at 02:08:30PM -0400, Steven Watanabe wrote: > I'm trying to do something like this in Python 2.4.3: > > class NamedSet(set): > def __init__(self, items=(), name=''): > set.__init__(self, items) > self.name = name > > class NamedList(list): > def __init__(self, items=(), name=''): > list.__init__(self, items) > self.name = name > > I can do: > > >>> mylist = NamedList(name='foo') > > but I can't do: > > >>> myset = NamedSet(name='bar') > TypeError: set() does not take keyword arguments > > How come? How would I achieve what I'm trying to do?
setobject.c checks for keyword arguments in it's __new__ instead of its __init__. I can't think of a good reason other to enforce inheriters to be maximally set-like. We're all adults here so I'd call it a bug. bufferobect, rangeobject, and sliceobject all do this too, but classmethod and staticmethod both check in tp_init. Go figure. As a work around use a function to make the set-alike. class NamedSet(set): pass def make_namedset(vals, name): ob = NamedSet(vals) ob.name = name return ob Then make_namedset as a constructor in place of NamedSet(vals, name) -Jack -- http://mail.python.org/mailman/listinfo/python-list
