[IPython-dev] Incompatible change discussion: Pretty printing of ordered dict.

[Steve Holden]

It's always difficult to change a long-established behaviour. I'd prefer that dict  printing stayed as it is - I haven't seen many complaints so far, and as has been pointed out the key ordering is available if required.  S

Sent from my iPhone

> On 4 Aug 2017, at 15:36, Wes Turner <wes.turner at gmail.com> wrote:
> 
> ```python
> repr(dict)
> 
> import pprint
> pprint.pprint(dict)
> print(pprint.pformat(dict)
> ```
> 
>> On Friday, August 4, 2017, MinRK <benjaminrk at gmail.com> wrote:
>> I'm pretty strongly in favor of keeping the sorting in our default pretty-printing. It's extremely valuable for interacting with dictionaries to have consistent, predictable display. There are plenty of ways to illustrate dict ordering, such as by iterating through the dict , e.g. `list(dict)`.
>> 
>> -Min
>> 
>>> On Thu, Aug 3, 2017 at 6:38 PM, Carl Smith <carl.input at gmail.com> wrote:
>>> I'm with Thomas.
>>> 
>>> 
>>>> On Wed, 2 Aug 2017 22:30 Wes Turner, <wes.turner at gmail.com> wrote:
>>>> Maybe a SORT_DICT_KEYS bool configuration setting? Really practically only in order to teach:
>>>> 
>>>> - dict
>>>>   - https://docs.python.org/3/tutorial/datastructures.html#dictionaries
>>>> - PYTHONHASHSEED / -R
>>>>   - https://docs.python.org/3/using/cmdline.html#envvar-PYTHONHASHSEED
>>>>   - https://docs.python.org/3/using/cmdline.html#cmdoption-R
>>>> - collections.OrderedDict (is backwards compatible)
>>>>   - https://docs.python.org/3/library/collections.html#ordereddict-objects
>>>> 
>>>> 
>>>> 
>>>>> On Wednesday, August 2, 2017, Matthias Bussonnier <bussonniermatthias at gmail.com> wrote:
>>>>> Hi all,
>>>>> 
>>>>> As you may or may not be aware, with Python 3.6 the dictionary are
>>>>> ordered by default. It is technically an implementation detail, though
>>>>> some people would love for it not to.
>>>>> 
>>>>> Regardless, IPython has for a long time pretty-printed the dictionary
>>>>> with _sorted_ keys, this thus prevent to teach python and show that
>>>>> dictionaries maintain order. Thus there is the question of wether we
>>>>> should disable sorting keys while pretty-printing.
>>>>> 
>>>>> https://github.com/ipython/ipython/issues/10110
>>>>> 
>>>>> This seem like a minor change, but I'd like to know if some of you are
>>>>> _relying_ on the ordering of dict when they are printed, or have
>>>>> compelling arguments against (or for) removing sorting of the keys
>>>>> before pretty_printing.
>>>>> 
>>>>> If you care about the above subject, please have your voice heard in
>>>>> above issue.
>>>>> 
>>>>> Thanks,
>>>>> --
>>>>> Matthias
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