[Python-ideas] True and False are singletons

Rhodri James rhodri at kynesim.co.uk
Mon Mar 18 10:02:52 EDT 2019

On 18/03/2019 12:19, Richard Damon wrote:
> On 3/18/19 7:27 AM, Greg Ewing wrote:
>> Juancarlo Añez wrote:
>>>     if settings[MY_KEY] is True:
>>>         ...
>> If I saw code like this, it would take a really good argument to
>> convince me that it shouldn't be just
>>      if settings[MY_KEY]:
>>          ...
> That means something VERY different. The first asks if the item is
> specifically the True value, while the second just asks if the value is
> Truthy, it wold be satisfied also for values like 1.

Yes.  And the latter is what people almost always mean.

Rhodri James *-* Kynesim Ltd

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