Ten quirky things about Python


	Ten quirky things about Python

ylodi

1-16-2008 7:44 AM

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python

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<div style="margin: 12px 0px; font-family: arial; color: #333333; background: #ffffff; border: solid 4px #e5e5e5; width: 100%; clear: left;"><div class="CM_CTB_Content_Wrap" style="margin: 0px; padding: 0px;background-color: #ffffff;"><div style="border-bottom: solid 1px #dcdcdc; white-space: nowrap; margin-bottom: 8px; background-color: #eeeeee ;background-image: url(http://clipmarks.com/images/source-bg.gif); background-repeat: repeat-x; height: 24px; line-height: 24px; vertical-align: middle; padding-bottom: 4px; color: #666666; font-size: 10px;" ><a href="http://clipmarks.com/clip-to-blog/" title="see clips that are hot right now"><img src="http://content.clipmarks.com/blog_embed/0beebf84-11c0-40b8-b78d-6d57ddd2f170/35B98608-1EF0-477E-AB53-D0F1310731AA/" alt="" width="19" height="19" border="0" style="vertical-align: middle; margin: 0px 4px; display: inline; border: none; float:none;" /></a>clipped from <a title="http://blog.micropledge.com/2008/01/ten-python-quirkies/" href="http://blog.micropledge.com/2008/01/ten-python-quirkies/" style="font-size: 11px;">blog.micropledge.com</a></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://blog.micropledge.com/2008/01/ten-python-quirkies/"><H2><A title="Permanent link to this post" href="http://blog.micropledge.com/2008/01/ten-python-quirkies/">Ten quirky things about Python</A></H2></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://blog.micropledge.com/2008/01/ten-python-quirkies/"><P>Just thought I’d share a bunch of neat (and weird) things I’ve noticed about the <A href="http://python.org/">Python programming language</A>:</P></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://blog.micropledge.com/2008/01/ten-python-quirkies/"><li style="margin-left:16px;padding-left: 0px;">You can <A href="http://docs.python.org/ref/comparisons.html">chain comparisons</A> as in <CODE>assert 3.14 &lt; pi &lt; 3.15</CODE>. It’s a neat equivalent of <CODE>assert pi &gt; 3.14 and pi &lt; 3.15</CODE> that you can’t do in most other languages.</LI></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://blog.micropledge.com/2008/01/ten-python-quirkies/"><P>Ints don’t overflow at 31 (or 32) bits, they just get promoted to longs automatically. And long in Python doesn’t mean 64 bits, it means arbitrarily long (albeit somewhat slower). In fact, it looks like in Python 3000 <A href="http://www.python.org/dev/peps/pep-0237/">there won’t even be the int/long distinction</A>.</P></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://blog.micropledge.com/2008/01/ten-python-quirkies/"><P>When concatenating strings, <CODE>''.join(list)</CODE> is <A href="http://www.skymind.com/~ocrow/python_string/">much faster</A> than <CODE>for x in list: s += x</CODE>. In fact, the <CODE>join</CODE> is O(N) whereas the <CODE>+=</CODE> is O(N²). There’s been a <A href="http://mail.python.org/pipermail/python-dev/2004-August/046686.html">lot of debate</A> about making this faster, and it looks like it <A href="http://svn.python.org/view/python/trunk/Python/ceval.c?rev=36830&view=diff&r1=36830&r2=36829&p1=python/trunk/Python/ceval.c&p2=/python/trunk/Python/ceval.c">should be faster in Python 2.5</A>, but <A href="http://blogstatic.micropledge.com/2008/01/strcat.py.txt">my tests</A> show otherwise. Any ideas why?</P></blockquote></div><div style="margin: 0px 6px 6px 4px;"><table style="font-size: 11px;border-spacing: 0px;padding: 0px;" cellpadding="0" cellspacing="0" width="100%"><tr><td style="background:transparent;border-width:0px;padding:0px;">&nbsp;</td><td align="right" style="background:transparent;border-width:0px;padding:0px;width:107px" width="107"><a href="http://clipmarks.com/share/35B98608-1EF0-477E-AB53-D0F1310731AA/blog/" title="blog or email this clip"><img src="http://content6.clipmarks.com/images/c2b-foot.png" border="0" alt="blog it" width="107" height="17" style="border-width:0px;padding:0px;margin:0px;" /></a></td></tr></table></div></div>

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