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On 10-Jul-07, at 1:37 PM, Lavergne Thomas wrote:

at start I have :
  value = object[idx]
it was simple and elegant. I've hopped for this :
  value, delta = object[idx]
but it's impossible.

Sure, but you could certainly implement it as:

  value, delta = object(idx)

Just give object a __call metamethod.