Robin Becker <[EMAIL PROTECTED]> writes: > Steve Holden wrote: > .........intain). >> >> Of course, using SQL against a traditional RDBMS will not return rows >> with NULL values for salary in a query such as >> >> SELECT name, address WHERE salary < 10000 >> >> precisely *because* NULL (absence of value) does not compare with any >> value. So you could say that 3.0 is forcing us to acknowledge database >> reality ;-) >> >> regards >> Steve > on the other hand I find it odd that > > cmp(None,None) fails in Python 3 when None==None returns True. > > In fact it seems that because None is non-comparable I need to write > at least three of the comparisons at least as two only leads to > errors. So now even though I can sort my objects with None I still > cannot sort [None,None]
Using the key argument you don't have to do all this: Python 3.0rc1+ (py3k:66521, Sep 21 2008, 07:58:29) [GCC 4.0.1 (Apple Inc. build 5465)] on darwin Type "help", "copyright", "credits" or "license" for more information. >>> def none_first(x): ... return (0,) if x is None else (1, x) ... >>> sorted([5, 4, None, 8, None], key=none_first) [None, None, 4, 5, 8] -- Arnaud -- http://mail.python.org/mailman/listinfo/python-list
