Version 1.7.2

Features

• No storage option/support for serialization, by @henryiii in #1098

Fixes

• Correct repr for MultiCell by @henryiii in #1087
• Fix serialization round-trip for 3D histograms with empty axes by @Copilot in #1094
• Fix __setitem__ axis index mismatch when slices are not leading indices by @Copilot in #1097
• Support 0D MeanView/WeightedMeanView by @Copilot in #1100
• Broadcast scalar axis args to match array sample length in Mean/WeightedMean fill by @Copilot in #1101

Typing

• Slightly better getitem type by @henryiii in #1086

Internal

• Use pattern matching in another place by @henryiii in #1092
• Move to using prek by @henryiii in #1105
• Add AGENTS.md by @henryiii in #1106

Full Changelog: v1.7.1...v1.7.2

Version 1.7.1

This release solely contains typing changes and fixes; histograms now hold the storage type.

Typing

• Make the Histogram type generic, by @henryiii in #1081, #1082, #1083
• The MultiCell storage takes an argument (missed in typing), by @henryiii in #1080

Full Changelog: v1.7.0...v1.7.1

Version 1.7.0

This release adds a new MultiCell storage, allowing an predefined number of values to be histogrammed per bin. Python 3.10+ is now required, and free-threaded support only ships binaries for 3.14t.

Features

• MultiCell storage, supporting a variable number of values, by @Superharz in #1008
• Record growth=True in writer-info (serialization), and respect it if present by @henryiii in #1074
• Drop Python 3.9 by @henryiii in #1057
• Drop Python 3.13t (use 3.14t instead) by @henryiii in #1079

Bug fixes

• Don't add empty metadata dicts by @henryiii in #1048
• Avoid compiler warning: declaration of 'i' hides previous local declaration by @Superharz in #1068

Internal

• Refactor __getitem__ using pattern matching by @henryiii in #1067
• pytest log_level is better than log_cli_level by @henryiii in #1059
• Setting __file__ no longer required (pybind11 3.0) by @henryiii in #1066
• This should work on iOS now in cibuildwheel by @henryiii in #1049

New Contributors

• @Superharz made their first contribution in #1068

Full Changelog: v1.6.1...v1.7.0

Version 1.6.1

This release fixes several issues with serialization as it's being prepared in Hist/uhi.

Features

• Support __dict__ on histogram like axes #1041
• Allow library to be specified in writer_info removal #1042

Bug fixes

• Avoid mutating lists given in indexing #1047
• Histogram metadata not being serialized correctly #1038
• Unset classic metadata shouldn't show up in serialization #1039
• Set dict correctly when unserializing #1040
• Serialization was broken for N>1D complex storage histograms #1043

Full Changelog: v1.6.0...v1.6.1

Version 1.6.0

This release adds support for UHI serialization for use with the uhi library, supported in the next release of uhi. A new diagnostic test has been added in the wheel, so you can quickly check your compile of boost-histogram without the full test suite. Quite a few fixes are present, as well, including a fix for *=, setting a range with a scalar, setting with a callable in a slice. Backend changes include many new clang-tidy checks that reduce the number of copies and refcount changes. We now build with pybind11 3.0.

This release drops support for Python 3.8, and adds Python 3.14(t), iOS, Windows ARM, and GraalPy.

Features

• Initial support for uhi's serialization #997, #1030, #1033, #1034, #1035
• Drop Python 3.8 #976
• Support Windows ARM #1001
• Support Python 3.14 and 3.14t #1018
• Support iOS #1020, #1027
• Added diagnostics test #1022
• Recommend/use np.s_ for slicing in dicts #1002

Bug fixes

• Support setting ranges with histograms (fixes *= too) #1036
• Support a callable in range setting #1036
• Support setting a range with a scalar #1000
• Account for fuzzy edge values in rebinning with edges #999
• Rename C++ metadata to raw_metadata #979
• Address lots of clang-tidy suggestions, should be faster with less copies/refcount bumps #1009, #1010, #1011, #1012, #1013, #1014, #1015

CI and testing

• Add CMake presets for testing and clang-tidy #1009

New Contributors

• @riga made their first contribution in #999
• @pfackeldey made their first contribution in #1002

Full Changelog: v1.5.2...v1.6.0

Version 1.5.2

Fix for axis metadata not passing though non-uniform rebinning correctly. Flow bins are now preserved when doing a non-uniform rebinning. Also adds the ability to rebin by edges or an existing axis.

This is expected to be the last release with Python 3.8 support. Manylinux support will likely be bumped from 2024 to 2_28 soon, as well.

Features

• Support edges= and axis= in bh.rebin #977
• Allow axis to be passed through bh.rebin #980, #982

Bug fixes

• Axis metadata was broken when rebinning #978
• Flow bins were lost when using variable rebinning #977
• Scikit-build-core 0.11, with PEP 639 license metadata #986, #988
• Prepare for an potential upcoming pybind11 3 change #994

CI and testing

• Remove extras like [test] in favor of dependency-groups #973
• Multithreaded test running #987

Full Changelog: v1.5.1...v1.5.2

Version 1.5.1

What's Changed

Fixes

• Make non-uniform rebinning work for Weight() and friends by @Saransh-cpp in #972

CI and internal

• Restore missing wheels by @henryiii in #959
• Fix misplaced inherit by @henryiii in #962
• Update cibw config by @henryiii in #969
• Use dependency-groups by @henryiii in #973

Full Changelog: v1.5.0...v1.5.1

Version 1.5.0

Features

• Support variable rebinning #913
• Removed support for Python 3.7 #952
• Added support for Python 3.13 and free-threaded Python 3.13t #950
• Add GitHub artifact attestations to package distribution #933

Backend and docs

• Move build to scikit-build-core #887
• Clean up sdist files #928
• Minor touchup to build backend, use scikit-build-core 0.10+ #948

CI and testing

• Try cibuildwheel pyodide #935
• Try to fix pyodide build #934
• Update emscripten build #937
• Bump to Pyodide 3.12 #938
• Speed up pyodide job by a few seconds #941
• Update jobs and noxfile #929
• Use pylint 3.2 github formatter instead #932
• Add some CI speedups #939
• Faster cibuildwheel #942
• Adapt to final release of NumPy 2.1.0 #951

Full Changelog: v1.4.1...v1.5.0

Version 1.4.1

Features

• NumPy 2 support. #918
• 32-bit Windows Python 3.12 wheel added (matching NumPy). #920

Bugfixes

• Support filling Integer axes with unsigned integers #917
• Avoid triggering NumPy 2 dev release install on Python 3.12. #914

Backend and docs

• Add missing API docs #909
• Use boost 1.84 #920

New Contributors

• @Saransh-cpp made their first contribution in #909
• @veprbl made their first contribution in #917

Full Changelog: v1.4.0...v1.4.1

Version 1.4.0

This release supports Python 3.7-3.12. You can now turn off the flow bin on Int/Str Categories, and filling an integer-based axis requires an integer array - a floating point array is disallowed (a single float was always disallowed), due to issues with rounding around 0.

Features

• overflow=False is now supported for IntCategory and StrCategory. #883

Changes

• Using _storage_type now produces a DeprecationWarning instead of PendingDeprecationWarning. #801
• Updated Boost to 1.82. The upper limit on Regular axes without overflow is now inclusive like NumPy. #802
• Produce more detailed error messages on C++ errors #848

Bugfixes

• Make filling an integer axis with a float array (also) an error. #876
• Include -latomic on armv7l #823

Backend and docs

• Add Python 3.12 support and binary wheels, also latest PyPy. manylinux2014+ required. #880, #878
• Drop Python 3.6 support. #798
• Drop pre-built wheels for 32-bit Linux (NumPy also dropped). #849
• Add testing for WebAssembly (Pyodide). #850
• Use Ruff #829

New Contributors

• @matthewfeickert made their first contribution in #823

Full Changelog: v1.3.2...v1.4.0