Bug in python!? persistent value of an optional parameter in function!

[Gabriel Genellina]

En Wed, 07 Mar 2007 23:39:21 -0300, C Barr Leigh <cpblPublic at gmail.com>  
escribió:

> Help! Have I found a serious bug?

Not at all! This is by design.

> def testPersistence(anarg,twooption=[]):
>     #print anarg
>     if not twooption:
>         twooption.append('Set within test for '+anarg)

See  
http://effbot.org/pyfaq/why-are-default-values-shared-between-objects.htm

-- 
Gabriel Genellina