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List:       python-list
Subject:    Re: Use cases for del
From:       Reinhold Birkenfeld <reinhold-birkenfeld-nospam () wolke7 ! net>
Date:       2005-07-10 8:49:36
Message-ID: 3jc5p0Fp4nlgU1 () individual ! net
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Ron Adam wrote:

>>     >>> 'abc' is 'abcd'[:3]
>>     False
> 
> Well of course it will be false... your testing two different strings! 
> And the resulting slice creates a third.
>
> Try:
> 
> ABC = 'abc'
> 
> value = ABC
> if value is ABC:   # Test if it is the same object
>     pass

That's not going to buy you any time above the "is None", because identity-
testing has nothing to do with the type of the object.

Additionally, using "is" with immutable objects is horrible.

Reinhold
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