On Wed, Mar 21, 2018 at 11:14 AM, David Mertz <me...@gnosis.cx> wrote:
> I've been using and teaching python for close to 20 years and I never > noticed that x.is_integer() exists until this thread. I would say the "one > obvious way" is less than obvious. > > On the other hand, `x == int(x)` is genuinely obvious... and it > immediately suggests the probably better `math.isclose(x, int(x))` that is > what you usually mean. > We can argue about this forever, but I don't think I would have come up with that either when asked "how to test a float for being a whole number". I would probably have tried "x%1 == 0" which is terrible. I like to have an API that doesn't have the pitfalls of any of the "obvious" solutions that numerically naive people would come up with, and x.is_integer() is it. Let's keep it. -- --Guido van Rossum (python.org/~guido)
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