Daniel Fetchinson wrote:

I agree that array.array is more efficient than a list but the input
for my function will come from PIL and PIL returns a list. So I have a
list to begin with which will be passed to the C function.

With recent versions of PIL, numpy can create an array from an Image very quickly, possibly without any copying of memory.

--
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
 that is made terrible by our own mad attempt to interpret it as though it had
 an underlying truth."
  -- Umberto Eco

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