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Mypy Release Notes

Next release

Mypy 1.13

We’ve just uploaded mypy 1.13 to the Python Package Index (PyPI).Mypy is a static type checker for Python. You can install it as follows:

python3 -m pip install -U mypy

You can read the full documentation for this release onRead the Docs.

Note that unlike typical releases, Mypy 1.13 does not have any changes to type checking semanticsfrom 1.12.1.

Improved performance

Mypy 1.13 contains several performance improvements. Users can expect mypy to be 5-20% faster.In environments with long search paths (such as environments using many editable installs), mypycan be significantly faster, e.g. 2.2x faster in the use case targeted by these improvements.

Mypy 1.13 allows use of theorjson library for handling the cache instead of the stdlibjson,for improved performance. You can ensure the presence oforjson using thefaster-cache extra:

python3 -m pip install -U mypy[faster-cache]

Mypy may depend onorjson by default in the future.

These improvements were contributed by Shantanu.

List of changes:

• Significantly speed up file handling error paths (Shantanu, PR17920)
• Use fast path in modulefinder more often (Shantanu, PR17950)
• Let mypyc optimise os.path.join (Shantanu, PR17949)
• Make is_sub_path faster (Shantanu, PR17962)
• Speed up stubs suggestions (Shantanu, PR17965)
• Use sha1 for hashing (Shantanu, PR17953)
• Use orjson instead of json, when available (Shantanu, PR17955)
• Add faster-cache extra, test in CI (Shantanu, PR17978)

Acknowledgements

Thanks to all mypy contributors who contributed to this release:

• Shantanu Jain
• Jukka Lehtosalo

Mypy 1.12

We’ve just uploaded mypy 1.12 to the Python Package Index (PyPI). Mypy is a static type

... (truncated)

• eb31034 Bump version to 1.13.0
• 2eeb588 Update changelog for 1.12.1 (#17999)
• bc0386b Changelog for 1.13 (#18000)
• 5c4d2db Add faster-cache extra, test in CI (#17978)
• 854ad18 Make is_sub_path faster (#17962)
• 50aa4ca Speed up stubs suggestions (#17965)
• 7c27808 Use orjson instead of json, when available (#17955)
• 2cd2406 Use fast path in modulefinder more often (#17950)
• e20aaee Let mypyc optimise os.path.join (#17949)
• 159974c Use sha1 for hashing (#17953)
• Additional commits viewable incompare view

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