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<html><head><meta http-equiv="Content-Type" content="text/html charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;">On Aug 16, 2014, at 6:28 PM, Nick Coghlan <<a href="mailto:ncoghlan@gmail.com">ncoghlan@gmail.com</a>> wrote:<br><div apple-content-edited="true">
<div style="color: rgb(0, 0, 0); font-family: 'Lucida Grande'; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-align: -webkit-auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><br></div></div><div><blockquote type="cite">I've seen a few people on python-ideas express the assumption that<br>there will be another Py3k style compatibility break for Python 4.0.<br></blockquote><div><br></div><div>Whenever I mention Python 4 or PEP 4000, itâs always a joke. However, saying upfront that we will never break compatibility is a bold statement. Technically even introducing new syntax breaks compatibility. Not to mention fixing long-lasting bugs. So youâd need to split hairs just defining what we mean by a âmajor compatibility breakâ.</div><div><br></div><div>Worse, if we ever did a change that we feel is within the bounds of the contract, youâd have someone pointing at that PEP saying that they feel we broke the contract. Splitting hairs again.</div><div><br></div><div>PEP 404 was necessary for some people/organizations to move on. I fail to see how PEP 4000 (or rather PEP 4004? ;-)) would be useful in that context.</div><div><br></div><div><span style="font-family: 'Lucida Grande'; orphans: 2; widows: 2;">-- </span><br style="font-family: 'Lucida Grande'; orphans: 2; widows: 2;"><span style="font-family: 'Lucida Grande'; orphans: 2; widows: 2;">Best regards,</span><br style="font-family: 'Lucida Grande'; orphans: 2; widows: 2;"><span style="font-family: 'Lucida Grande'; orphans: 2; widows: 2;">Åukasz Langa</span><br style="font-family: 'Lucida Grande'; orphans: 2; widows: 2;"><br style="font-family: 'Lucida Grande'; orphans: 2; widows: 2;"><span style="font-family: 'Lucida Grande'; orphans: 2; widows: 2;">WWW: <a href="http://lukasz.langa.pl/">http://lukasz.langa.pl/</a></span><br style="font-family: 'Lucida Grande'; orphans: 2; widows: 2;"><span style="font-family: 'Lucida Grande'; orphans: 2; widows: 2;">Twitter: @llanga</span><br style="font-family: 'Lucida Grande'; orphans: 2; widows: 2;"><span style="font-family: 'Lucida Grande'; orphans: 2; widows: 2;">IRC: ambv on #python-dev</span></div></div></body></html>
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