[IPython-dev] display of dicts?

[Nathan Goldbaum]

Nope, I believe it's this:
https://github.com/ipython/ipython/blob/dc9d1c679424589480bb83af64aa5ee21031d311/IPython/lib/pretty.py

On Mon, Dec 18, 2017 at 7:56 PM, Chris Barker <chris.barker at noaa.gov> wrote:

> Thanks Nathan,
>
> And to confirm, this is the stdlib's pprint module, yes?
>
> (which does seem to show the same behavior)
>
> -CHB
>
>
>
> On Mon, Dec 18, 2017 at 5:40 PM, Nathan Goldbaum <nathan12343 at gmail.com>
> wrote:
>
>> IPython does use pretty-printing by default. You can control it with the
>> %pprint magic, in your IPython configuration, with the
>> PlainTextFormatter.pprint option, or with the --pprint command line
>> argument when starting IPython.
>>
>> http://ipython.readthedocs.io/en/stable/config/options/termi
>> nal.html#configtrait-PlainTextFormatter.pprint
>>
>>
>>
>> On Mon, Dec 18, 2017 at 7:08 PM, Chris Barker <chris.barker at noaa.gov>
>> wrote:
>>
>>> As Guido has just declared that dicts will now officially preserve order:
>>>
>>> https://mail.python.org/pipermail/python-dev/2017-December/151283.html
>>>
>>> I was playing around  them in py3.6 ipython, and found some (to me) odd
>>> behavior:
>>>
>>> In [1]: d = {'one':1, 'two':2, 'three':3}
>>>
>>> In [2]: d
>>> Out[2]: {'one': 1, 'three': 3, 'two': 2}
>>>
>>> Hmm -- order does not appear to be preserved.
>>>
>>> But then:
>>>
>>> In [3]: str(d)
>>> Out[3]: "{'one': 1, 'two': 2, 'three': 3}"
>>>
>>> In [4]: repr(d)
>>> Out[4]: "{'one': 1, 'two': 2, 'three': 3}"
>>>
>>> In [5]: d.values()
>>> Out[5]: dict_values([1, 2, 3])
>>>
>>> In [6]: d.keys()
>>> Out[6]: dict_keys(['one', 'two', 'three'])
>>>
>>> In [7]: d.items()
>>> Out[7]: dict_items([('one', 1), ('two', 2), ('three', 3)])
>>>
>>> Order IS preserved.
>>>
>>> So presumably iPython is calling sorted() or some such when displaying a
>>> dict.
>>>
>>> Is that that case? Is that documented anywhere?? I can't find it.
>>>
>>> And with Python >= 3.6, dict order is preserved, so it would probably be
>>> better to NOT mess with dict order when displaying them in iPython.
>>>
>>> SIDE NOTE:
>>>
>>> I had a bit of trouble finding this mailing list -- google still points
>>> to the old ones on scipy.org. -- maybe we can put a note on the home
>>> page of those lists that they are been moved??
>>>
>>> (I only noticed, 'cause the archives of those stop last March)
>>>
>>> -Chris
>>>
>>>
>>>
>>>
>>>
>>> --
>>>
>>> Christopher Barker, Ph.D.
>>> Oceanographer
>>>
>>> Emergency Response Division
>>> NOAA/NOS/OR&R            (206) 526-6959   voice
>>> 7600 Sand Point Way NE   (206) 526-6329   fax
>>> Seattle, WA  98115       (206) 526-6317   main reception
>>>
>>> Chris.Barker at noaa.gov
>>>
>>> _______________________________________________
>>> IPython-dev mailing list
>>> IPython-dev at python.org
>>> https://mail.python.org/mailman/listinfo/ipython-dev
>>>
>>>
>>
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>>
>>
>
>
> --
>
> Christopher Barker, Ph.D.
> Oceanographer
>
> Emergency Response Division
> NOAA/NOS/OR&R            (206) 526-6959   voice
> 7600 Sand Point Way NE   (206) 526-6329   fax
> Seattle, WA  98115       (206) 526-6317   main reception
>
> Chris.Barker at noaa.gov
>
> _______________________________________________
> IPython-dev mailing list
> IPython-dev at python.org
> https://mail.python.org/mailman/listinfo/ipython-dev
>
>
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