[Nick Coghlan]
> > Hmm, it might be nice if there was a UserList.ListMixin that was the
> > counterpart to UserDict.DictMixin
[Steven Bethard]
> I've thought this occasionally too. One of the tricky issues though is
> that often you'd like to define __getitem__ for single items and have
> ListMixin add the code for slices. I haven't figured out how to do this
> cleanly yet...
All that is needed is a helper function and a two line idiom for calling it from
inside __getitem__:
def sliceit(self, sliceobj):
return [self[i] for i in xrange(*sliceobj.indices(len(self)))]
class AlphaList:
def __getitem__(self, i):
if isinstance(i, slice):
return sliceit(self, i)
return chr(i+64)
def __len__(self):
return 26
a = AlphaList()
print a[1], a[2], a[5]
print a[2:5]
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