[Python-Dev] Guarantee ordered dict literals in v3.7?

[Stephen J. Turnbull]

Chris Barker writes:

 > Nathaniel Smith has pointed out that eval(pprint(a_dict)) is
 > supposed to return the same dict -- so documented behavior may
 > already be broken.

Sure, but that's because we put shoes on a snake.  Why anybody expects
no impediment to slithering, I don't know!

I understand the motivation to guarantee order, but it's a programmer
convenience that has nothing to do with the idea of mapping, and the
particular (insertion) order is very special and usually neither
relevant nor reproducible.  I have no problem whatsoever with just
documenting any failure to preserve order while reproducing dicts,
*except* that a process that inserts keys in the same order had better
result in the same insertion order.

Steve