Python3迭代器不执行下一步

为什么Python3中的迭代器支持

\uuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuu？是否不应直接调用，而应仅在执行以下操作时调用：

 for i in iterator:
      dosomething(i)

我有一个用例，我想调用
next
。例如，对递增整数流使用
itertools.count
。我想：

from itertools import count
    cnt = count(0)
    one(cnt.next())
    two(cnt.next()) 

现在，我可以使用
\uuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuu

@khelwood是2.6+，但是那些没有这一点的人面临着比迭代器fu更大的问题，因为它们不能向前兼容。
one(next(cnt))