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<div dir="ltr"><div class="gmail_extra"><div class="gmail_quote">On Fri, Nov 21, 2014 at 8:47 AM, Antoine Pitrou <span dir="ltr"><<a href="mailto:solipsis@pitrou.net" target="_blank">solipsis@pitrou.net</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><span class="">On Fri, 21 Nov 2014 05:47:58 -0800<br>
Raymond Hettinger <<a href="mailto:raymond.hettinger@gmail.com">raymond.hettinger@gmail.com</a>> wrote:<br>
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> Another issue is that it breaks the way I and others have taught for years that generators are a kind of iterator (an object implementing the iterator protocol) and that a primary motivation for generators is to provide a simpler and more direct way of creating iterators. However, Chris explained that, "This proposal causes a separation of generators and iterators, so it's no longer possible to pretend that they're the same thing." That is a major and worrisome conceptual shift.<br>
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</span>I agree with Raymond on this point.<br clear="all"></blockquote><div><br></div><div>Pretending they're the same thing has always been fraught with subtle errors. From the *calling* side a generator implements the same protocol as any other iterator (though it also has a few others -- send(), throw(), close()). However *inside* they are not at all similar -- generators produce a value is done through "yield", __next__() methods use return.<br><br></div><div>Even if we end up rejecting the PEP we should campaign for better understanding of generators. Raymond may just have to fix some of his examples.<br></div></div><br>-- <br><div class="gmail_signature">--Guido van Rossum (<a href="http://python.org/~guido">python.org/~guido</a>)</div>
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