On 15Jul2011 20:17, Steven D'Aprano <steve+comp.lang.pyt...@pearwood.info> wrote: | Cameron Simpson wrote: | > I suppose there's no scope for having the append-to-the-list step sanity | > check for the sentinel (be it None or otherwise)? | | It is not my responsibility to validate data during construction, only to do | the right thing when given that data. The right thing being, raise an | exception if values are not numeric, unless an explicit "missing" value | (whatever that ends up being).
Well there you go. You need to use MISSING, not None. As you say, None can easily be a mistake and you want to be sure. If what you describe as "right" is right, then I too would be using a special sentinal instead of None. -- Cameron Simpson <c...@zip.com.au> DoD#743 http://www.cskk.ezoshosting.com/cs/ The English language has a word to describe a group of anarcho-collectivists without resorting to spiffy hyphenated coined phrases: a mob. - Tim Mefford, <t...@physics.orst.edu> -- http://mail.python.org/mailman/listinfo/python-list
