Reference
Steven D'Aprano
steve at pearwood.info
Mon Mar 3 22:45:55 EST 2014
On Mon, 03 Mar 2014 13:48:39 -0500, Terry Reedy wrote:
> On 3/3/2014 4:42 AM, ast wrote:
>
>> Consider following code:
>>
>>>>> A=7
>>>>> B=7
>>>>> A is B
>
> The 'is' operator has three uses, two intended and one not. In
> production code, 'is' tests that an object *is* a particular singular
> object, such as None or a sentinel instance of class object. In test
> code, 'is' can also be used to test details of a particular
> implementation, such as pre-allocation of small ints. New python
> programmers also use it to confuse themselves.
+1 QOTW
--
Steven
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