René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"`dict` items views have set like operations even when the values are not hashable.","articleBody":"# Documentation\r\n\r\n\r\n\u003e Keys views are set-like since their entries are unique and [:term:`hashable`](https://github.com/python/cpython/blob/main/Doc/library/stdtypes.rst#id650). If all values are hashable, so that (key, value) pairs are unique and hashable, then the items view is also set-like. (Values views are not treated as set-like since the entries are generally not unique.) For set-like views, all of the operations defined for the abstract base class [:class:`collections.abc.Set`](https://github.com/python/cpython/blob/main/Doc/library/stdtypes.rst#id652) are available (for example, ==, \u003c, or ^). While using set operators, set-like views accept any iterable as the other operand, unlike sets which only accept sets as the input.\r\n\r\n\r\n```\r\n\u003e {1:2, 3:4}.items() \u003e= {1:2}.items()\r\nTrue\r\n\u003e {1:[2], 3:4}.items() \u003e= {1:[2]}.items()\r\nTrue\r\n\u003e set({1:[2], 3:4}.items())\r\nTypeError: unhashable type: 'list'\r\n```\r\n\r\nIt seems like this documentation is not accurate. `dict.items()` does have set operations even when the values are not hashable. \r\n\r\nSee also: https://stackoverflow.com/questions/77399592/set-like-behaviour-of-dict-items-for-non-hashable-values\n\n\u003c!-- gh-linked-prs --\u003e\n### Linked PRs\n* gh-112051\n* gh-112052\n\u003c!-- /gh-linked-prs --\u003e\n","author":{"url":"https://github.com/EvanTheB","@type":"Person","name":"EvanTheB"},"datePublished":"2023-11-01T22:32:17.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":5},"url":"https://github.com/111622/cpython/issues/111622"}