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

Wes Turner wes.turner at gmail.com
Wed Aug 2 17:29:55 EDT 2017


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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