Re: [Python-Dev] Coroutines, generators, function calling

We yield values from inside for loops all over the place, but the yielded value is very rarely just the index value (only 1 of 14 yields) , but something calculated from the index value, so the new syntax would not be useful, unless it was something that provided access to the index item as a variable, like:

yield foo(i) for i in x

which barely saves you anything (a colon, a newline, and an indent). (hey wait, isn't that a generator comprehension?

Here's a use case: def preorder(tree): if tree: yield tree yield from preorder(tree.left) yield from preorder(tree.right)