<html><head><meta http-equiv="Content-Type" content="text/html charset=us-ascii"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; ">Actually this was the value doing the mutating, i.e, the <thing> i pushed or added, would be returned as operation's output. I see what you're saying, and I wasn't thinking of chaining so much as being able to include the operation in a expression and, in particular, a generator scenario. <div><br></div><div>Ordered sequence of unique values from sequence with possible repeats</div><div>[seen.added(value) for value in sequence if value not in seen] * </div><div><br></div><div> * again, please forgive the method names, I was hoping to crowd source something better ;-)</div><div><br></div><div>Replaces workarounds like: </div><div>[seen.setdefault(value, value) for value in sequence if value not in seen] or </div><div>seen = dict(sequence); [unique.pop(value) for value in sequence if value in unique]</div><div><br></div><div>Like I said, it's incredibly simple to just extend set and list and add these in user space. </div><div><div apple-content-edited="true">
<div style="color: rgb(0, 0, 0); font-family: Helvetica; font-size: medium; 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; "><br class="Apple-interchange-newline"><br class="Apple-interchange-newline"><br class="Apple-interchange-newline"><br></div><div style="color: rgb(0, 0, 0); font-family: Helvetica; font-size: medium; 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; "><br></div><div style="color: rgb(0, 0, 0); font-family: Helvetica; font-size: medium; 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; "><br></div><div style="color: rgb(0, 0, 0); font-family: Helvetica; font-size: medium; 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; ">Shane Green </div><div style="color: rgb(0, 0, 0); font-family: Helvetica; font-size: medium; 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; "><a href="http://www.umbrellacode.com">www.umbrellacode.com</a></div><div style="color: rgb(0, 0, 0); font-family: Helvetica; font-size: medium; 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; ">408-692-4666 | <a href="mailto:shane@umbrellacode.com">shane@umbrellacode.com</a></div>
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<br><div><div>On Mar 27, 2013, at 9:49 PM, Terry Reedy <<a href="mailto:tjreedy@udel.edu">tjreedy@udel.edu</a>> wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite">On 3/27/2013 10:29 PM, Shane Green wrote:<br><blockquote type="cite">I'm not sure if there's anything inherently wrong with this idea, and I<br>am well aware how incredibly easy it is to implement as an extension of<br>the built-ins, but, I find it very useful to have /variations/ of<br>list().append(obj) and set().add(obj) that return, obj.<br></blockquote><br>There are other people who agree with you, but it is Guido's design decision from the beginning of Python that mutation methods do not return the object mutated.<br><br>-- <br>Terry Jan Reedy<br><br>_______________________________________________<br>Python-ideas mailing list<br><a href="mailto:Python-ideas@python.org">Python-ideas@python.org</a><br>http://mail.python.org/mailman/listinfo/python-ideas<br></blockquote></div><br></div></body></html>