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Remove deprecated feature: ext must start with . in mimetypes.add_type #149720

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Remove deprecated feature: ext must start with . in mimetypes.add_type#149720
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sobolevn
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stdlibStandard Library Python modules in the Lib/ directorytype-featureA feature request or enhancement

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@sobolevn
sobolevn
opened on May 12, 2026

Feature or enhancement

See #75223

cpython/Lib/mimetypes.py

Lines 95 to 103 in f5fb491

if ext and not ext.startswith('.'):
from warnings import _deprecated
_deprecated(
"Undotted extensions",
"Using undotted extensions is deprecated and "
"will raise a ValueError in Python {remove}",
remove=(3, 16),
)

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Activity

  1. sobolevn
    self-assigned this
    on May 12, 2026
  2. sobolevn
    added
    type-featureA feature request or enhancement
    stdlibStandard Library Python modules in the Lib/ directory
    on May 12, 2026
  3. sobolevn
    added a commit that references this issue on May 12, 2026

    gh-149720: Remove support for undotted `ext` in `mimetypes.MimeType.a…

    0534774
  4. StanFromIreland
    marked mimetypes.add_type should complain when you give it an undotted ext #75223 as a duplicate of this issue on May 12, 2026
  5. StanFromIreland
    closed this as completedon May 12, 2026
  6. sobolevn
    added a commit that references this issue on May 13, 2026

    gh-149720: Fix docs for `mimetypes.MimeType.add_type` method (#149731)

    31d1a72
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