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

Steve Holden steve at holdenweb.com
Mon Dec 18 10:23:12 EST 2017

On Fri, Dec 15, 2017 at 9:47 PM, Guido van Rossum <guido at python.org> wrote:

> ​[...]

> stays ordered across deletions" part of the ruling is true in CPython 3.6.
> I don't know what guidance to give Eric, because I don't know what other
> implementations do nor whether Eric cares about being compatible with
> those. IIUC micropython does not guarantee this currently, but I don't know
> if they claim Python 3.6 compatibility -- in fact I can't find any document
> that specifies the Python version they're compatible with more precisely
> than "Python 3".

​They currently specify 3.4+.

Specifically, https://github.com/micropython/micropython includes:

MicroPython implements the entire Python 3.4 syntax (including exceptions,
with, yield from, etc., and additionally async/await keywords from Python
3.5). The following core datatypes are provided: str (including basic
Unicode support), bytes, bytearray, tuple, list, dict, set, frozenset,
array.array, collections.namedtuple, classes and instances. Builtin modules
include sys, time, and struct, etc. Select ports have support for
_thread module
(multithreading). *Note that only a subset of Python 3 functionality is
implemented for the data types and modules*.

Note the emphasis I added on the last sentence.
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