[Python-ideas] Programming recommendations (PEP 8) and boolean values

Georg Brandl g.brandl at gmx.net
Thu Aug 9 07:48:57 CEST 2012

On 08.08.2012 23:56, Ned Batchelder wrote:
> On 8/8/2012 4:29 PM, Georg Brandl wrote:
>> For None, "==" and "is" are equivalent, because no other object is equal
>> to None.  For True and False, this is different, and using "is" here is
>> a very stealthy bug.
> It's easy to make other objects == None, by writing buggy __eq__
> methods.  That doesn't happen much, but it's easier with __ne__, where
> the negated logic is easy to screw up.  I've seen it happen. Use "is
> None", not "== None".

That's true indeed.


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