Remove Python 3.8 and 3.9 compatibility

.github/workflows/tests.yml

@@ -48,11 +48,11 @@ jobs:
         python-version: ['3.11', '3.12']
         include:
           - os: ubuntu-latest
-            python-version: 3.8
+            python-version: '3.10'
             DEPENDENCIES: dask==2021.8.1 diffsims==0.5.2 hyperspy==1.7.3 matplotlib==3.5 numba==0.57 numpy==1.23.0 orix==0.12.1 pooch==1.3.0 pyebsdindex==0.2.0 scikit-image==0.21.0
             LABEL: -oldest
           - os: ubuntu-latest
-            python-version: 3.12
+            python-version: '3.12'
             LABEL: -minimum_requirement
     steps:
       - uses: actions/checkout@v4

CHANGELOG.rst

@@ -21,6 +21,8 @@ Added
 
 Changed
 -------
+- Minimum Python version is now 3.10.
+  (`#? <https://github.com/pyxem/kikuchipy/pull/?>`_)
 
 Removed
 -------

README.rst

@@ -19,7 +19,7 @@ library.
 .. |tests_status| image:: https://github.com/pyxem/kikuchipy/actions/workflows/tests.yml/badge.svg
    :target: https://github.com/pyxem/kikuchipy/actions/workflows/tests.yml
 
-.. |python| image:: https://img.shields.io/badge/python-3.8+-blue.svg
+.. |python| image:: https://img.shields.io/badge/python-3.10+-blue.svg
    :target: https://www.python.org/downloads/
 
 .. |Coveralls| image:: https://coveralls.io/repos/github/pyxem/kikuchipy/badge.svg?branch=develop

conftest.py

@@ -24,7 +24,7 @@
 import os
 from pathlib import Path
 import tempfile
-from typing import Callable, Generator, List
+from typing import Callable, Generator
 
 import dask.array as da
 from diffpy.structure import Atom, Lattice, Structure
@@ -39,10 +39,11 @@
 import skimage.color as skc
 
 import kikuchipy as kp
+from kikuchipy import constants
 from kikuchipy.data._data import marshall
 from kikuchipy.io.plugins._h5ebsd import _dict2hdf5group
 
-if kp.constants.installed["pyvista"]:
+if constants.installed["pyvista"]:
     import pyvista as pv
 
     pv.OFF_SCREEN = True
@@ -227,7 +228,7 @@ def nickel_phase(nickel_structure) -> Generator[Phase, None, None]:
 
 
 @pytest.fixture
-def pc1() -> Generator[List[float], None, None]:
+def pc1() -> Generator[list[float], None, None]:
     """One projection center (PC) in TSL convention."""
     yield [0.4210, 0.7794, 0.5049]
 

doc/dev/code_style.rst

@@ -34,7 +34,7 @@ Package imports should be structured into three blocks with blank lines between
 We use type hints in the function definition without type duplication in the function
 docstring, for example::
 
-    def my_function(a: int, b: Optional[bool] = None) -> Tuple[float, np.ndarray]:
+    def my_function(a: int, b: bool | None = None) -> tuple[float, np.ndarray]:
         """This is a new function.
 
         Parameters

doc/dev/handling_deprecations.rst

@@ -24,7 +24,7 @@ The decorator should be placed right above the object signature to be deprecated
 Parameters can be deprecated as well::
 
     @deprecate_argument(name="n", since=0.8, removal=0.9, alternative="m")
-    def foo(self, n: Optional[int] = None, m: int: Optional[int] = None) -> int:
+    def foo(self, n: int | None = None, m: int: int | None = None) -> int:
         if m is None:
             m = n
         return m + 1

doc/user/installation.rst

@@ -4,7 +4,7 @@ Installation
 
 kikuchipy can be installed with `pip <https://pypi.org/project/kikuchipy/>`__,
 `conda <https://anaconda.org/conda-forge/kikuchipy>`__, the
-:ref:`hyperspy:hyperspy-bundle`, or from source, and supports Python >= 3.8.
+:ref:`hyperspy:hyperspy-bundle`, or from source, and supports Python >= 3.10.
 All alternatives are available on Windows, macOS and Linux.
 
 .. _install-with-pip:

pyproject.toml

@@ -10,11 +10,9 @@ description = "Processing, simulating, and indexing of electron backscatter diff
 license = {file = "LICENSE"}
 readme = {file = "README.rst", content-type = "text/x-rst"}
 dynamic = ["version"]
-requires-python = ">= 3.8"
+requires-python = ">= 3.10"
 classifiers = [
     "Programming Language :: Python :: 3",
-    "Programming Language :: Python :: 3.8",
-    "Programming Language :: Python :: 3.9",
     "Programming Language :: Python :: 3.10",
     "Programming Language :: Python :: 3.11",
     "Programming Language :: Python :: 3.12",
@@ -50,7 +48,8 @@ dependencies = [
     "lazy_loader",
     "matplotlib       >= 3.5",
     "numba            >= 0.57",
-    "numpy            >= 1.23.0",
+    # TODO: Remove pinning of NumPy <2 once HyperSpy 2.0 is supported
+    "numpy            >= 1.23.0, <2",
     "orix             >= 0.12.1",
     "pooch            >= 1.3.0",
     "pyyaml",

src/kikuchipy/_rotation/__init__.py

@@ -70,7 +70,7 @@ def _rotation_from_rodrigues(rx: float, ry: float, rz: float) -> np.ndarray:
     d = s * rz / norm
     rot = np.array([a, b, c, d], dtype="float64")
 
-    if rot[0] < 0:  # pragma: no cover
+    if rot[0] < 0:
         rot = -rot
 
     return rot

src/kikuchipy/_util/_deprecated.py

@@ -28,7 +28,7 @@
 
 import functools
 import inspect
-from typing import Callable, Optional, Union
+from typing import Callable
 import warnings
 
 import numpy as np
@@ -47,11 +47,11 @@ class deprecated:
 
     def __init__(
         self,
-        since: Union[str, int, float],
-        alternative: Optional[str] = None,
+        since: str | int | float,
+        alternative: str | None = None,
         alternative_is_function: bool = True,
-        removal: Union[str, int, float, None] = None,
-    ):
+        removal: str | int | float | None = None,
+    ) -> None:
         """Visible deprecation warning.
 
         Parameters
@@ -71,7 +71,7 @@ def __init__(
         self.alternative_is_function = alternative_is_function
         self.removal = removal
 
-    def __call__(self, func: Callable):
+    def __call__(self, func: Callable) -> None:
         # Wrap function to raise warning when called, and add warning to
         # docstring
         if self.alternative is not None:
@@ -91,7 +91,7 @@ def __call__(self, func: Callable):
             msg = f"Attribute `{func.__name__}` is deprecated{rm_msg}.{alt_msg}"
 
         @functools.wraps(func)
-        def wrapped(*args, **kwargs):
+        def wrapped(*args, **kwargs) -> Callable:
             warnings.simplefilter(
                 action="always", category=np.VisibleDeprecationWarning, append=True
             )
@@ -126,13 +126,19 @@ class deprecated_argument:
     <https://github.com/scikit-image/scikit-image/blob/main/skimage/_shared/utils.py#L115>`_.
     """
 
-    def __init__(self, name, since, removal, alternative=None):
+    def __init__(
+        self,
+        name: str,
+        since: str | float,
+        removal: str | float,
+        alternative: str | None = None,
+    ) -> None:
         self.name = name
         self.since = since
         self.removal = removal
         self.alternative = alternative
 
-    def __call__(self, func):
+    def __call__(self, func: Callable) -> Callable:
         @functools.wraps(func)
         def wrapped(*args, **kwargs):
             if self.name in kwargs.keys():

src/kikuchipy/_util/_transfer_axes.py

@@ -15,11 +15,16 @@
 # You should have received a copy of the GNU General Public License
 # along with kikuchipy. If not, see <http://www.gnu.org/licenses/>.
 
+from hyperspy.axes import AxesManager
 
-def _transfer_navigation_axes_to_signal_axes(new_axes, old_axes):
+
+def _transfer_navigation_axes_to_signal_axes(
+    new_axes: AxesManager, old_axes: AxesManager
+) -> AxesManager:
     """Transfer navigation axis calibrations from an old signal to the
-    signal axes of a new signal produced from it by a generator. Used
-    from methods that generate a signal with a single value at each
+    signal axes of a new signal produced from it by a generator.
+
+    Used from methods that generate a signal with a single value at each
     navigation position.
 
     Adapted from the pyxem package.

src/kikuchipy/constants.py

@@ -18,15 +18,14 @@
 """Constants and such useful across modules."""
 
 from importlib.metadata import version
-from typing import Dict, List
 
 # NB! Update project config file if this list is updated!
-optional_deps: List[str] = [
+optional_deps: list[str] = [
     "pyvista",
     "nlopt",
     "pyebsdindex",
 ]
-installed: Dict[str, bool] = {}
+installed: dict[str, bool] = {}
 for pkg in optional_deps:
     try:
         _ = version(pkg)