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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Support frozendict in various builtins","articleBody":"The `type`, `str.maketrans`, and `bytes.maketrans` builtins should support `frozendict`.  The issues with `exec` and `eval` were reported in a separate issue.\n\n```python\n\u003e\u003e\u003e type(\"MyClass\", (), {\"x\": 10})\n\u003cclass '__main__.MyClass'\u003e\n                    \n\u003e\u003e\u003e type(\"MyClass\", (), frozendict({\"x\": 10}))\nTraceback (most recent call last):\n  File \"\u003cpyshell#30\u003e\", line 1, in \u003cmodule\u003e\n    MyClass = type(\"MyClass\", (), frozendict({\"x\": 10}))\nTypeError: type.__new__() argument 3 must be dict, not frozendict\n\n\u003e\u003e\u003e str.maketrans(dict({'a': 'A'}))\n{97: 'A'}\n\n\u003e\u003e\u003e str.maketrans(frozendict({'a': 'A'}))\nTraceback (most recent call last):\n  File \"\u003cpyshell#23\u003e\", line 1, in \u003cmodule\u003e\n    str.maketrans(frozendict({'a': 'A'}))\nTypeError: if you give only one argument to maketrans it must be a dict\n```\n\n\u003c!-- gh-linked-prs --\u003e\n### Linked PRs\n* gh-145124\n* gh-145129\n\u003c!-- /gh-linked-prs --\u003e\n","author":{"url":"https://github.com/rhettinger","@type":"Person","name":"rhettinger"},"datePublished":"2026-02-22T15:37:01.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":1},"url":"https://github.com/145118/cpython/issues/145118"}