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I don't think most people will heed this warning. I warned people in a programming forum that Python ordering of objects by insertion time was a implementation

• kstrauser 2y ago
  That definitely was true, and I use to jitter my code a little to deliberately find and break tests that depended on any particular ordering. It's now explicitly documented to be true, and you can officially rely on it. From https://docs.python.org/3/library/stdtypes.html#dict https://docs.python.org/3/library/stdtypes.html#dict: > Changed in version 3.7: Dictionary order is guaranteed to be insertion order. That link documents the Python language's semantics, not the behavior of any particular interpreter.
• dragonwriter 2y ago
  > I warned people in a programming forum that Python ordering of objects by insertion time was a implementation detail, because it's not guaranteed by any PEP PEPs do not provide a spec for Python, they neither cover the initial base language before the PEP process started, nor were all subsequent language changes made through PEPs. The closest thing Python has to a cross-implementation standard is the Python Language Reference for a particular version, treating as excluded anything explicitly noted as a CPython implementation detail. Dictionaries being insertion-ordered went from a CPython implementation detail in 3.6 to guaranteed language feature in 3.7+.