Remove support for Python 3.9

.github/workflows/python-tests.yml

@@ -19,7 +19,7 @@ jobs:
       matrix:
         include:
           - os: ubuntu-24.04
-            python-version: "3.9"
+            python-version: "3.10"
           - os: ubuntu-24.04
             python-version: "3.13"
           - os: macos-15
@@ -68,7 +68,7 @@ jobs:
     name: Python ${{ matrix.python-version }} / check build
     strategy:
       matrix:
-        python-version: ['3.9', '3.13']
+        python-version: ['3.10', '3.13']
         os: [ubuntu-24.04]
     steps:
       - uses: actions/checkout@v4

.github/workflows/torch-tests.yml

@@ -20,7 +20,7 @@ jobs:
         include:
           - os: ubuntu-24.04
             torch-version: "2.1"
-            python-version: "3.9"
+            python-version: "3.10"
             cargo-test-flags: --release
 
           - os: ubuntu-24.04

featomic-torch/CHANGELOG.md

@@ -17,6 +17,10 @@ a changelog](https://keepachangelog.com/en/1.1.0/) format. This project follows
 ### Removed
 -->
 
+### Changed
+
+- We now require Python >= 3.10
+
 ## [Version 0.7.1](https://github.com/metatensor/featomic/releases/tag/featomic-torch-v0.7.1) - 2025-09-17
 
 - Added support for torch v2.8, and metatensor-torch v0.8.0

featomic/CHANGELOG.md

@@ -17,6 +17,10 @@ a changelog](https://keepachangelog.com/en/1.1.0/) format. This project follows
 ### Removed
 -->
 
+### Changed
+
+- We now require Python >= 3.10
+
 ## [Version 0.6.3](https://github.com/metatensor/featomic/releases/tag/featomic-v0.6.2) - 2025-10-06
 
 ### Fixed

python/featomic/featomic/clebsch_gordan/_cartesian_spherical.py

@@ -413,7 +413,7 @@ def _do_coupling(
         )
 
         # create one block for each output of `cg_couple`
-        for o3_lambda, values in zip(o3_lambdas, outputs):
+        for o3_lambda, values in zip(o3_lambdas, outputs, strict=True):
             o3_sigma = int(old_sigma * (-1) ** (l1 + l2 + o3_lambda))
             new_keys_values.append(
                 [o3_lambda, o3_sigma] + _dispatch.to_int_list(key.values)

python/featomic/featomic/clebsch_gordan/_utils.py

@@ -195,7 +195,7 @@ def _group_combinations_of_same_blocks(
 
     keys_values: List[List[int]] = []
     combinations: List[Combination] = []
-    for (block_1, block_2), keys_idx in zip(groups, groups_keys):
+    for (block_1, block_2), keys_idx in zip(groups, groups_keys, strict=True):
         o3_lambdas: List[int] = []
         for key_i in keys_idx:
             keys_values.append(_dispatch.to_int_list(output_keys.values[key_i]))
@@ -248,7 +248,7 @@ def cg_tensor_product_blocks(
 
     # Create the TensorBlocks
     results: List[TensorBlock] = []
-    for values, o3_lambda in zip(combined_values, o3_lambdas):
+    for values, o3_lambda in zip(combined_values, o3_lambdas, strict=True):
         block = TensorBlock(
             values=values,
             samples=block_1.samples,

python/featomic/featomic/splines.py

@@ -241,6 +241,7 @@ def get_hypers(self):
                     self.spline.positions,
                     self.spline.values,
                     self.spline.derivatives,
+                    strict=True,
                 )
             ],
         }

python/featomic/featomic/systems/ase.py

@@ -90,7 +90,7 @@ def compute_neighbors(self, cutoff):
         self._pairs = []
 
         nl_result = neighborlist.neighbor_list("ijdDS", self._atoms, cutoff)
-        for i, j, d, D, S in zip(*nl_result):
+        for i, j, d, D, S in zip(*nl_result, strict=True):
             # we want a half neighbor list, so drop all duplicated neighbors
             if j < i:
                 continue

python/featomic/pyproject.toml

@@ -1,7 +1,7 @@
 [project]
 name = "featomic"
 dynamic = ["version", "authors", "optional-dependencies"]
-requires-python = ">=3.9"
+requires-python = ">=3.10"
 
 readme = "README.rst"
 license = "BSD-3-Clause"

python/featomic_torch/pyproject.toml

@@ -1,7 +1,7 @@
 [project]
 name = "featomic-torch"
 dynamic = ["version", "authors", "dependencies"]
-requires-python = ">=3.9"
+requires-python = ">=3.10"
 
 readme = "README.rst"
 license = "BSD-3-Clause"