Add future annotation to use list for typing

src/atomate2/common/schemas/elastic.py

@@ -1,9 +1,9 @@
 """Schemas for elastic tensor fitting and related properties."""
+from __future__ import annotations
 
 from copy import deepcopy
-from typing import List, Optional
+from typing import TYPE_CHECKING
 
-from emmet.core.math import Matrix3D, MatrixVoigt
 from pydantic import BaseModel, Field
 from pymatgen.analysis.elasticity import (
     Deformation,
@@ -12,12 +12,15 @@
     Strain,
     Stress,
 )
-from pymatgen.core import Structure
 from pymatgen.core.tensors import TensorMapping
 from pymatgen.symmetry.analyzer import SpacegroupAnalyzer
 
 from atomate2 import SETTINGS
 
+if TYPE_CHECKING:
+    from emmet.core.math import Matrix3D, MatrixVoigt
+    from pymatgen.core import Structure
+
 __all__ = [
     "DerivedProperties",
     "FittingData",
@@ -83,20 +86,20 @@ class DerivedProperties(BaseModel):
 class FittingData(BaseModel):
     """Data used to fit elastic tensors."""
 
-    cauchy_stresses: List[Matrix3D] = Field(
+    cauchy_stresses: list[Matrix3D] = Field(
         None, description="The Cauchy stresses used to fit the elastic tensor."
     )
-    strains: List[Matrix3D] = Field(
+    strains: list[Matrix3D] = Field(
         None, description="The strains used to fit the elastic tensor."
     )
-    pk_stresses: List[Matrix3D] = Field(
+    pk_stresses: list[Matrix3D] = Field(
         None, description="The Piola-Kirchoff stresses used to fit the elastic tensor."
     )
-    deformations: List[Matrix3D] = Field(
+    deformations: list[Matrix3D] = Field(
         None, description="The deformations corresponding to each strain state."
     )
-    uuids: List[str] = Field(None, description="The uuids of the deformation jobs.")
-    job_dirs: List[str] = Field(
+    uuids: list[str] = Field(None, description="The uuids of the deformation jobs.")
+    job_dirs: list[str] = Field(
         None, description="The directories where the deformation jobs were run."
     )
 
@@ -141,13 +144,13 @@ class ElasticDocument(BaseModel):
     def from_stresses(
         cls,
         structure: Structure,
-        stresses: List[Stress],
-        deformations: List[Deformation],
-        uuids: List[str],
-        job_dirs: List[str],
+        stresses: list[Stress],
+        deformations: list[Deformation],
+        uuids: list[str],
+        job_dirs: list[str],
         fitting_method: str = SETTINGS.ELASTIC_FITTING_METHOD,
-        order: Optional[int] = None,
-        equilibrium_stress: Optional[Matrix3D] = None,
+        order: int | None = None,
+        equilibrium_stress: Matrix3D | None = None,
         symprec: float = SETTINGS.SYMPREC,
         allow_elastically_unstable_structs: bool = True,
     ):