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How are Python dictionaries implemented and ordered?

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01

Understand the problem

Explain dict internals.

dictdata-structures
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03

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Dicts are hash tables giving average O(1) lookup/insert. Since Python 3.7 they preserve insertion order as a language guarantee. Keys must be hashable (immutable). They're the backbone of objects, namespaces, and kwargs.

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04

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PYAverage O(1) lookups, guaranteed insertion order
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