<html><head><meta http-equiv="Content-Type" content="text/html charset=windows-1252"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; ">That's clever: even works for zero because it's returned by or as second false. Cool. So I suppose I have to come up with more examples now ;-) <div><br></div><div>Actually, on that point, I actually think the seen.added(value) (with a better name) is quite a bit cleaner than the one using "or". Clever as it is, I think someone learning the language would flinch when they saw that… :-)</div><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 10:28 PM, Bruce Leban <<a href="mailto:bruce@leapyear.org">bruce@leapyear.org</a>> wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite"><br><div class="gmail_quote">On Wed, Mar 27, 2013 at 10:11 PM, Shane Green <span dir="ltr"><<a href="mailto:shane@umbrellacode.com" target="_blank">shane@umbrellacode.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div>[seen.added(value) for value in sequence if value not in seen] * </div><div></div></blockquote></div><div><br></div><div>Here's an easy way to do it:</div><div><br></div><div><div><font face="courier new, monospace">>>> seen = set()</font></div>
<div><font face="courier new, monospace">>>> seq = [3,2,1,2,3,4,5,4]</font></div><div><font face="courier new, monospace">>>> <span style="background-color:rgb(255,255,153)">[seen.add(v) or v for v in seq if v not in seen]</span></font></div>
<div><font face="courier new, monospace">[3, 2, 1, 4, 5]</font></div><div><font face="courier new, monospace">>>> seen</font></div><div><font face="courier new, monospace">{1, 2, 3, 4, 5}</font></div></div>
<div><br></div><div><font face="arial, helvetica, sans-serif"><br></font></div><div><font face="arial, helvetica, sans-serif">--- Bruce</font><div><span style="font-family:arial,helvetica,sans-serif">Latest blog post: Alice's Puzzle Page </span><a href="http://www.vroospeak.com/" style="font-family:arial,helvetica,sans-serif" target="_blank">http://www.vroospeak.com</a></div>
<div><div><font face="arial, helvetica, sans-serif">Learn how hackers think: <a href="http://j.mp/gruyere-security" target="_blank">http://j.mp/gruyere-security</a></font></div></div></div>
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