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From: Peter Otten <__peter__@web.de>
Subject: Re: count strangeness
Date: Sun, 22 May 2011 08:31:24 +0200
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Xref: x330-a1.tempe.blueboxinc.net comp.lang.python:5958

James Stroud wrote:

> tal 65% python2.7
> Python 2.7.1 (r271:86832, May 21 2011, 22:52:14)
> [GCC 4.2.1 (Apple Inc. build 5666) (dot 3)] on darwin
> Type "help", "copyright", "credits" or "license" for more information.
> py> class C(object):
> ...   def __init__(self):
> ...     self.data = []
> ...   def doit(self, count=0):
> ...     for c in self.data:
> ...       count += c.doit(count)
> ...     count += 1
> ...     print count
> ...     return count
> ...
> py> c = C()
> py> c.data.extend([C() for i in xrange(10)])
> py> c.doit()
> 1
> 2
> 4
> 8
> 16
> 32
> 64
> 128
> 256
> 512
> 1024
> 1024
> 
> 
> 
> WTF?

Put the code into a file, run it -- and be enlightened ;)