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There's also the indication that this is official, and not just an implementation quirk. I still used OrderedDict in 3.6 because there was no guarantee 3.7 (or

There's also the indication that this is official, and not just an implementation quirk. I still used OrderedDict in 3.6 because there was no guarantee 3.7 (or later) wouldn't silently break ordering on the standard dict. At least now it's unlikely to change because it will be considered a breaking change.

d0mine 7y ago
BDFL declared Python dict to be ordered in 2017 — It can't be more official than that for Python https://mail.python.org/pipermail/python-dev/2017-December/151283.html https://mail.python.org/pipermail/python-dev/2017-December/1... i.e., Python 3.7 (whatever implementation must keep the insertion order). CPython keeps the order since Python 3.6. Pypy even before that.
- user5994461 7y ago
  A barely legible email dump with 50 concurrent answers is supposed to be the clear official statement? Not to mention that developers just begin migrating to python 3 in 2017 and code still had to work on 2.7 that doesn't order.
  - true_religion 7y ago
    I knew about it, because everyone was talking about it. The origination of the actual information is irrelevant. It was basically interesting gossip for a few weeks.
  - anderskaseorg 7y ago
    The official release notes for the following release is certainly a clear official statement. https://www.python.org/downloads/release/python-370/ https://www.python.org/downloads/release/python-370/ “The insertion-order preservation nature of dict objects is now an official part of the Python language spec.” (June 27, 2018)
  - d0mine 7y ago
    The ruling is the very first and only line from the link: > Make it so. "Dict keeps insertion order" is the ruling. Thanks!