pre-PEP generic objects

Scott David Daniels Scott.Daniels at Acm.Org
Thu Dec 2 21:26:31 CET 2004


Nick Craig-Wood wrote:
> Scott David Daniels <Scott.Daniels at Acm.Org> wrote:
>> 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...
>>>>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!

I could have sworn I tested this, but I must have accidentally
tested h.a rather than h['a'].  I don't know why it doesn't work either.
For example:

     def gattr(*args): return getattr(*args)
     def sattr(*args): return setattr(*args)
     class Hash(object):
          def __init__(self, **kwargs):
              for key,value in kwargs.items():
                  setattr(self, key, value)
          __getitem__ = gattr
          __setitem__ = sattr

does work.

--Scott David Daniels
Scott.Daniels at Acm.Org



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