add mypy annotation

pydata · Jul 7, 2024 · 76ea963 · 76ea963
1 parent 2f65033
commit 76ea963
Showing 1 changed file with 2 additions and 1 deletion.
diff --git a/xarray/core/datatree.py b/xarray/core/datatree.py
@@ -61,7 +61,7 @@
     import pandas as pd
 
     from xarray.core.datatree_io import T_DataTreeNetcdfEngine, T_DataTreeNetcdfTypes
-    from xarray.core.merge import CoercibleValue
+    from xarray.core.merge import CoercibleMapping, CoercibleValue
     from xarray.core.types import ErrorOptions, NetcdfWriteModes, ZarrWriteModes
 
 # """
@@ -955,6 +955,7 @@ def update(
         Just like `dict.update` this is an in-place operation.
         """
         new_children: dict[str, DataTree] = {}
+        new_variables: CoercibleMapping
 
         if isinstance(other, Dataset):
             new_variables = other