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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Teach `pprint` about `frozendict`","articleBody":"# Feature or enhancement\n\n### Proposal:\n\nThe `pprint` code has a number of type or protocol specific handlers but doesn't have one for `frozendict` yet. So, we don't currently get pretty printing for `frozendict`:\n```python\n\u003e\u003e\u003e f = frozendict.fromkeys(range(10))\n\u003e\u003e\u003e g = frozendict.fromkeys(range(10))\n\u003e\u003e\u003e h = {0: f, 1: frozendict({2: g})}\n\u003e\u003e\u003e pprint.pp(h)\n{0: frozendict({0: None, 1: None, 2: None, 3: None, 4: None, 5: None, 6: None, 7: None, 8: None, 9: None}),\n 1: frozendict({2: frozendict({0: None, 1: None, 2: None, 3: None, 4: None, 5: None, 6: None, 7: None, 8: None, 9: None})})}\n```\n\nWe want `frozendict` to be pretty printed like this:\n```python\n\u003e\u003e\u003e f = frozendict.fromkeys(range(10))\n\u003e\u003e\u003e g = frozendict.fromkeys(range(10))\n\u003e\u003e\u003e h = {0: f, 1: frozendict({2: g})}\n\u003e\u003e\u003e pprint.pp(h)\n{0: frozendict({0: None,\n                1: None,\n                2: None,\n                3: None,\n                4: None,\n                5: None,\n                6: None,\n                7: None,\n                8: None,\n                9: None}),\n 1: frozendict({2: frozendict({0: None,\n                               1: None,\n                               2: None,\n                               3: None,\n                               4: None,\n                               5: None,\n                               6: None,\n                               7: None,\n                               8: None,\n                               9: None})})}\n```\n\nLet me know whether you think the pretty printing should be different.\n\ncc: @rhettinger for validating that the pretty printing should be as above.\n\nI'll create a trivial PR to fix this once validated.\n\n\n\n### Has this already been discussed elsewhere?\n\nThis is a minor feature, which does not need previous discussion elsewhere\n\n### Links to previous discussion of this feature:\n\n_No response_","author":{"url":"https://github.com/devdanzin","@type":"Person","name":"devdanzin"},"datePublished":"2026-02-21T11:05:04.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":2},"url":"https://github.com/145070/cpython/issues/145070"}