Nick Craig-Wood wrote: > Scott David Daniels <[EMAIL PROTECTED]> wrote: >> Nick Craig-Wood wrote: >> > class Hash: >> > def __init__(self, **kwargs): >> > for key,value in kwargs.items(): >> > setattr(self, key, value) >> > def __getitem__(self, x): >> > return getattr(self, x) >> > def __setitem__(self, x, y): >> > setattr(self, x, y) >> >> You can simplify this: >> class Hash(object): >> def __init__(self, **kwargs): >> for key,value in kwargs.items(): >> setattr(self, key, value) >> __getitem__ = getattr >> __setitem__ = setattr > > That doesn't work unfortunately... > >>>> class Hash(object): > ... def __init__(self, **kwargs): > ... for key,value in kwargs.items(): > ... setattr(self, key, value) > ... __getitem__ = getattr > ... __setitem__ = setattr > ... >>>> h=Hash(a=1,b=2) >>>> h.a > 1 >>>> h['a'] > Traceback (most recent call last): > File "<stdin>", line 1, in ? > TypeError: getattr expected at least 2 arguments, got 1 >>>> > > I'm not exactly sure why though!
Functions written in Python have a __get__ attribute while builtin functions (implemented in C) don't. Python-coded functions therefore automatically act as descriptors while builtins are just another attribute. See http://mail.python.org/pipermail/python-list/2004-May/219424.html for a strange example. Peter -- http://mail.python.org/mailman/listinfo/python-list
