Re: Bug in Python set

2010-05-02 Thread Aahz
In article 0bd314a8-db65-43f1-a999-521e2ed71...@n15g2000yqf.googlegroups.com, dmitrey dmitrey.kros...@scipy.org wrote: Python 2.6.5 r265:79063 set().update(set()) is None True while I expect result of update to be set. Also, result of set().add(None) is None while I expect it to be set with

Re: Bug in Python set

2010-05-02 Thread Steven D'Aprano
On Sun, 02 May 2010 05:11:40 -0700, dmitrey wrote: Python 2.6.5 r265:79063 set().update(set()) is None True while I expect result of update to be set. Change your expectations. Generally, methods which modify the object rather than creating a new one return None. s = set([1,2,3])

Re: Bug in Python set

2010-05-02 Thread Terry Reedy
On 5/2/2010 8:11 AM, dmitrey wrote: Python 2.6.5 r265:79063 set().update(set()) is None True while I expect result of update to be set. Also, result of set().add(None) is None while I expect it to be set with element None (or, maybe, it should be empty set?) 'Expect' has two different