AFAIK there's no way to have "yield" produce anything other than a
generator.
You could achieve the syntax you want with a decorator, although under
the hood it would still be iterating over a (key,value) tuples so
there's not really any point.
class GeneratorTupleWrapper:
def __init__(self, g):
self.g = g
def next(self):
key, self._value = g.next()
return key
def value(self):
return self._value
def magic_generator (func):
def wrapper(*a, **b):
return GeneratorTupleWrapper(func(*a, **b))
@magic_generator
def kviter(d):
for i in d:
yield i, d[i]
it = kviter(d)
for key in it:
if <something>:
foo(it.value())
Also: dict.iteritems() enumerates (key,value) tuples for dictionaries,
so kviter isn't necessary if d is a dictionary. I don't know the
internal mechanism used by dict for iteritems, but it's a fair bet that
it's more efficient than performing a lookup for every single key.
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