"/a" is not "/a" ?

[Robert Kern]

On 2009-03-06 13:46, Gary Herron wrote:
> Emanuele D'Arrigo wrote:
>> Hi everybody,
>>
>> while testing a module today I stumbled on something that I can work
>> around but I don't quite understand.
>
> *Do NOT use "is" to compare immutable types.* **Ever! **

Well, "foo is None" is actually recommended practice....

-- 
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