comparison with None

[Robert Kern]

Steven Howe wrote:
> Alan G Isaac wrote:
>>  >>> None >= 0
>> False
>>  >>> None <= 0
>> True
>>
>> Explanation appreciated.
>>
>> Thanks,
>> Alan Isaac
>>   
> I've read and found that 'None' comparisons is not always a good idea.
> Better to:
> from types import NoneType
> 
> x = None
> if type( x ) == NoneType:
>     # true
>     < code >
> else:
>     # false; do something else.
>     < more code >

The recommended idiom is to test for "x is None".

-- 
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