On Jan 3, 2008 2:37 PM, Matthew Brett <[EMAIL PROTECTED]> wrote: > Just to ask - is there a reason why this: > > > In [39]: all([]) > > Out[39]: True > > is the case?
Because it's True. Anything is true about the elements of an empty set, because there aren't any. In this case, all asks if all elements in [] are true, i.e., does x member [] -> x is true. Since x member [] is always false, the implication is always true. Recall that the statement x -> y has the same truth value as the statement x' or xy. Chuck
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