fix: support boost-histogram 1.6, add Python 3.14 to ci (#618)

Supports boost-histogram 1.6.

---------

Signed-off-by: Henry Schreiner <[email protected]>

Author: henryiii

.github/workflows/ci.yml

@@ -35,6 +35,7 @@ jobs:
         - "3.11"
         - "3.12"
         - "3.13"
+        - "3.14"
 
     name: Check Python ${{ matrix.python-version }}
     steps:
@@ -52,6 +53,11 @@ jobs:
       run: uv venv
 
     - name: Install package
+      if: matrix.python-version == '3.14'
+      run: uv pip install -e ".[test]"
+
+    - name: Install package (dask)
+      if: matrix.python-version != '3.14'
       run: uv pip install -e ".[test,dask]"
 
     - name: Test package

pyproject.toml

@@ -22,6 +22,7 @@ classifiers = [
     "Programming Language :: Python :: 3.11",
     "Programming Language :: Python :: 3.12",
     "Programming Language :: Python :: 3.13",
+    "Programming Language :: Python :: 3.14",
     "Topic :: Scientific/Engineering",
     "Topic :: Scientific/Engineering :: Information Analysis",
     "Topic :: Scientific/Engineering :: Mathematics",
@@ -35,7 +36,7 @@ keywords = [
 ]
 requires-python = ">=3.9"
 dependencies = [
-    "boost-histogram>=1.3.1,<1.6",
+    "boost-histogram>=1.3.1,<1.7",
     "histoprint>=2.2.0",
     'numpy>=1.19.3',
     'typing-extensions>=4;python_version<"3.11"',

src/hist/axestuple.py

@@ -50,7 +50,7 @@ def name(self) -> tuple[str]:
     def name(self, values: Iterable[str]) -> None:
         # strict = True from Python 3.10
         for ax, val in zip(self, values, strict=True):
-            ax._ax.metadata["name"] = val
+            ax._raw_metadata["name"] = val
 
         disallowed_names = {"weight", "sample", "threads"}
         for ax in self:

src/hist/axis/__init__.py

@@ -32,7 +32,8 @@ def __dir__() -> tuple[str, ...]:
 
 
 class CoreAxisProtocol(Protocol):
-    metadata: dict[str, Any]
+    metadata: dict[str, Any]  # boost-histogram < 1.6
+    raw_metadata: dict[str, Any]
 
 
 class AxisProtocol(Protocol):
@@ -44,6 +45,9 @@ def name(self) -> str: ...
     label: str
     _ax: CoreAxisProtocol
 
+    @property
+    def _raw_metadata(self) -> dict[str, Any]: ...
+
 
 class AxesMixin:
     __slots__ = ()
@@ -52,23 +56,30 @@ class AxesMixin:
     def __init_subclass__(cls, **kwargs: Any) -> None:
         super().__init_subclass__(**kwargs)
 
+    @property
+    def _raw_metadata(self: AxisProtocol) -> dict[str, Any]:
+        # boost-histogram < 1.6
+        if hasattr(self._ax, "metadata"):
+            return self._ax.metadata
+        return self._ax.raw_metadata
+
     @property
     def name(self: AxisProtocol) -> str:
         """
         Get the name for the Regular axis
         """
-        return typing.cast(str, self._ax.metadata.get("name", ""))
+        return typing.cast(str, self._raw_metadata.get("name", ""))
 
     @property
     def label(self: AxisProtocol) -> str:
         """
         Get or set the label for the Regular axis
         """
-        return self._ax.metadata.get("label", "") or self.name
+        return self._raw_metadata.get("label", "") or self.name
 
     @label.setter
     def label(self: AxisProtocol, value: str) -> None:
-        self._ax.metadata["label"] = value
+        self._raw_metadata["label"] = value
 
     def _repr_args_(self: AxisProtocol) -> list[str]:
         """
@@ -117,7 +128,7 @@ def __init__(
             transform=transform,
             __dict__=__dict__,
         )
-        self._ax.metadata["name"] = name
+        self._raw_metadata["name"] = name
         self.label: str = label
 
 
@@ -136,7 +147,7 @@ def __init__(
             metadata=metadata,
             __dict__=__dict__,
         )
-        self._ax.metadata["name"] = name
+        self._raw_metadata["name"] = name
         self.label: str = label
 
 
@@ -166,7 +177,7 @@ def __init__(
             circular=circular,
             __dict__=__dict__,
         )
-        self._ax.metadata["name"] = name
+        self._raw_metadata["name"] = name
         self.label: str = label
 
 
@@ -198,7 +209,7 @@ def __init__(
             circular=circular,
             __dict__=__dict__,
         )
-        self._ax.metadata["name"] = name
+        self._raw_metadata["name"] = name
         self.label: str = label
 
 
@@ -232,7 +243,7 @@ def __init__(
             **kwargs,
             __dict__=__dict__,
         )
-        self._ax.metadata["name"] = name
+        self._raw_metadata["name"] = name
         self.label: str = label
 
 
@@ -266,5 +277,5 @@ def __init__(
             **kwargs,
             __dict__=__dict__,
         )
-        self._ax.metadata["name"] = name
+        self._raw_metadata["name"] = name
         self.label: str = label