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Am 15.02.14 01:57, schrieb Chris Angelico: > Can you give an example of an ambiguous case? Fundamentally, the 'is' > operator tells you whether its two operands are exactly the same > object, nothing more and nothing less, so I assume your "ambiguous > cases" are ones where it's possible for two things to be either the > same object or two indistinguishable ones. What about the thing I posted down in this thread? >>> import numpy as np >>> a=np.array([1, 2, 3, 4]) >>> b=a[:] >>> id(a) 140267900969344 >>> id(b) 140267901045920 So, a and b are different things, right? >>> b[1]=37 >>> b array([ 1, 37, 3, 4]) >>> a array([ 1, 37, 3, 4]) Still they are connected. I can imagin that id() is just a debugging tool for extensions. What useful applications does it have outside of this? Christian

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