Description

sobolevn

opened on May 12, 2026

Issue body actions

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),
	)

Linked PRs

• gh-149720: Remove support for undotted ext in mimetypes.MimeType.add_type #149721
• gh-149720: Fix docs for mimetypes.MimeType.add_type method #149731

Activity

1. sobolevn

   self-assigned this

   on May 12, 2026
2. sobolevn

   added

   type-featureA feature request or enhancementA feature request or enhancement

   stdlibStandard Library Python modules in the Lib/ directoryStandard 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

Issue actions