Might be problematic for third-party cache backends which implement 
*has_key* and rely on *__contains__* calling it - don't see how you can 
show the warning in that case.

On Saturday, January 30, 2016 at 12:34:14 PM UTC, Tim Graham wrote:
>
> Yes, but dict.has_key() is removed in Python 3. If we started the 
> deprecation in Django now, it would be scheduled for removal in Django 2.0 
> which also drops support for Python 2.
>
> On Friday, January 29, 2016 at 8:04:33 PM UTC-5, Curtis Maloney wrote:
>>
>> Isn't this so it complies with the dict interface? True, it's discouraged 
>> now, but it's still there.
>>
>>
>>
>> On 30 January 2016 10:42:12 am LHDT, Tim Graham <timog...@gmail.com> 
>> wrote:
>>>
>>> Also the template BaseContext class has an undocumented has_key() 
>>> method. I wonder if that can be removed without a deprecation?
>>>
>>> https://github.com/django/django/pull/6066
>>>
>>> On Friday, January 29, 2016 at 6:11:54 PM UTC-5, Tim Graham wrote:
>>>>
>>>> Any opposition to deprecating Cache.has_key()? Cache already implements 
>>>> __contains__() so converting has_key() to "in" can be done with existing 
>>>> versions of Django. Anyone using flake8 will get a warning about has_key() 
>>>> usage: W601 .has_key() is deprecated, use 'in'.
>>>>
>>>
>> -- 
>> Sent from my Android device with K-9 Mail. Please excuse my brevity.
>>
>

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