"/a" is not "/a" ?

[Steve Holden]

Paul Rubin wrote:
> Steven D'Aprano <steve at pearwood.info> writes:
>> It is never
>> correct to avoid using "is" when you need to compare for identity.
> 
> When is it ever necessary to compare for identity?

For example when providing a unique "sentinel" value as a function
argument.  The parameter must be tested for identity with the sentinel.

regards
 Steve
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