Antoon Pardon wrote:
> Will it ever be possible to write things like:
>
> a = 4:9
> for key, value in tree.items('alfa.': 'beta.'):
The first of these works fine, except you need to use the correct syntax:
>>> a = slice(4,9)
>>> range(10)[a]
[4, 5, 6, 7, 8]
>>>
The second also works fine, provide tree is a type which supports it and
you rewrite the call as tree.items(slice('alfa','beta.')) or perhaps
tree['alfa':'beta.'].items(). To support slicing directly on a dictionary
you could do:
>>> class sliceable(dict):
def __getitem__(self, item):
if isinstance(item, slice):
return self.__class__((k,v) for (k,v) in self.iteritems()
if item.start <= k < item.stop)
return dict.__getitem__(self, item)
>>> d = sliceable({'alpha': 1, 'aaa': 2, 'beta': 3, 'bee': 4 })
>>> d['alpha':'beta']
{'alpha': 1, 'bee': 4}
>>> d['alpha':'beta.']
{'alpha': 1, 'beta': 3, 'bee': 4}
>>> for key, value in d['alpha':'beta.'].items():
print key, value
alpha 1
beta 3
bee 4
It seems unlikely that this will make it into the builtin dict type, but
you never know.
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