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Idiom gone, or did it really ever exist? () is ()

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"Mike C. Fletcher" <mcfletch at home.com> wrote in<mailman.987578846.15784.python-list at python.org>: > You want this kind of construct when creating "generic services" that> can process any object type (including None), so need to be able to> determine whether the object passed is, in fact, the value None, or> merely the absence of a value.>>So why not use the portable and safe way of finding out whether your function was called with a particular argument or not?   def foo(**kw):       validargs = { 'bar': None }       validargs.update(kw)       assert len(validargs)==1       if kw.has_key('bar'):           print "Have bar"       else:           print "No bar"-- Duncan Boothduncan at dales.rmplc.co.ukint month(char *p){return(124864/((p[0]+p[1]-p[2]&0x1f)+1)%12)["\5\x8\3""\6\7\xb\1\x9\xa\2\0\4"];} // Who said my code was obscure?

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