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Support frozendict in various builtins #145118

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Support frozendict in various builtins#145118
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StanFromIreland
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interpreter-core(Objects, Python, Grammar, and Parser dirs)type-featureA feature request or enhancement

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@rhettinger
rhettinger
opened on Feb 22, 2026

The type, str.maketrans, and bytes.maketrans builtins should support frozendict. The issues with exec and eval were reported in a separate issue.

>>> type("MyClass", (), {"x": 10})
<class '__main__.MyClass'>
                    
>>> type("MyClass", (), frozendict({"x": 10}))
Traceback (most recent call last):
  File "<pyshell#30>", line 1, in <module>
    MyClass = type("MyClass", (), frozendict({"x": 10}))
TypeError: type.__new__() argument 3 must be dict, not frozendict

>>> str.maketrans(dict({'a': 'A'}))
{97: 'A'}

>>> str.maketrans(frozendict({'a': 'A'}))
Traceback (most recent call last):
  File "<pyshell#23>", line 1, in <module>
    str.maketrans(frozendict({'a': 'A'}))
TypeError: if you give only one argument to maketrans it must be a dict

Linked PRs

Activity

  1. rhettinger
    added
    3.15bugs and security fixes
    on Feb 22, 2026
  2. StanFromIreland
    added
    type-featureA feature request or enhancement
    interpreter-core(Objects, Python, Grammar, and Parser dirs)
    on Feb 22, 2026
  3. StanFromIreland
    self-assigned this
    on Feb 22, 2026
  4. picnixz
    changed the title [-]Support frozendict is various builtins[/-] [+]Support frozendict in various builtins[/+] on Feb 22, 2026
  5. brianschubert
    removed
    3.15bugs and security fixes
    on Feb 22, 2026
  6. vstinner
    added a parent issue on Feb 22, 2026
  7. rhettinger
    added a commit that references this issue on Feb 23, 2026

    gh-145118: Add `frozendict` support to `str.maketrans()` (gh-145129)

    1dfbde9
  8. brijkapadia
    added a commit that references this issue on Feb 28, 2026

    pythongh-145118: Add `frozendict` support to `str.maketrans()` (pytho…

    f054382
  9. vstinner
    added a commit that references this issue on Mar 2, 2026

    gh-145118: Add `frozendict` support to `type()` (#145124)

    f8d2f9f

  10. vstinner commented on Mar 3, 2026

    @vstinner
    vstinner
    on Mar 3, 2026
    Member

    The type, str.maketrans, and bytes.maketrans builtins should support frozendict.

    It's now done, I close the issue.

  11. vstinner
    closed this as completedon Mar 3, 2026
  12. ljfp
    added 2 commits that reference this issue on Apr 25, 2026

    pythongh-145118: Add `frozendict` support to `str.maketrans()` (pytho…

    4355058

    pythongh-145118: Add `frozendict` support to `type()` (python#145124)

    a21cc34
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