A.T.Hofkamp a écrit :
> Hello all,
>
> This morning I tried to create my own read-only dictionary, and failed
> miserably.
> I don't understand why, can somebody enlighten me?
>
(snip)
> So if copying all methods of a native dictionary is not enough, what should I
> do to make my class work as a dictionary WITHOUT deriving from dict (which
> will
> obviously work).
>
Sorry, I missed this last requirement. BTW, why don't you want to
subclass dict ?
Anyway, something like the following should do the trick
(NB : Q&D, needs at least some testing):
class ReadOnlyDict(object):
def __init__(self, *args, **kw):
self._dict = dict(*args, **kw)
def __getattr__(self, name):
if name in ('__setitem__', 'setdefault'):
raise AttributeError("%s is read-only" % \
self.__class__.__name__)
return getattr(self._dict, name)
for name in dir(dict):
if name.startswith('__') \
and name not in ('__new__', '__init__',
'__setitem__', '__class__', '__dict__'):
exec("%s = dict.%s" % (name, name))
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