Add COD support.

pymatgen/core/structure.py

@@ -64,7 +64,7 @@
     from pymatgen.util.typing import CompositionLike, MillerIndex, PathLike, PbcLike, SpeciesLike
 
 FileFormats = Literal["cif", "poscar", "cssr", "json", "yaml", "yml", "xsf", "mcsqs", "res", "pwmat", ""]
-StructureSources = Literal["Materials Project"]
+StructureSources = Literal["Materials Project", "COD"]
 
 
 class Neighbor(Site):
@@ -2945,14 +2945,18 @@ def from_id(cls, id: str, source: StructureSources = "Materials Project", **kwar
 
         Args:
             id: The id. E.g., the materials project id.
-            source: Source of the data. Defaults to "Materials Project", which is the only currently support method.
+            source: Source of the data. Defaults to "Materials Project".
             **kwargs: Pass-through to any API calls.
         """
         if source == "Materials Project":
             from pymatgen.ext.matproj import MPRester
 
             mpr = MPRester(**kwargs)
             return mpr.get_structure_by_material_id(id)  # type: ignore
+        elif source == "COD":
+            from pymatgen.ext.cod import COD
+            cod = COD()
+            return cod.get_structure_by_id(id)
         raise ValueError(f"Invalid source: {source}")
 
     @classmethod

tests/core/test_structure.py

@@ -928,6 +928,8 @@ def test_from_id(self):
         s = Structure.from_id("mp-1143")
         assert isinstance(s, Structure)
         assert s.reduced_formula == "Al2O3"
+        s = Structure.from_id("1101077", source="COD")
+        assert s.reduced_formula == "LiV2O4"
 
     def test_mutable_sequence_methods(self):
         struct = self.struct