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No it is in 3.6 already! It used to be not guaranteed. https://mail.python.org/pipermail/python-dev/2016-September/146327.html https://mail.python.org/pipermai

No it is in 3.6 already! It used to be not guaranteed. https://mail.python.org/pipermail/python-dev/2016-September/146327.html https://mail.python.org/pipermail/python-dev/2016-September/... But it is insertion order indeed, not sorting order.

gsnedders 10y ago
The behaviour is there in CPython, yes. But the language documentation doesn't, deliberately.