Update xarray/core/common.py

Co-authored-by: Justus Magin <[email protected]>
pydata · Jul 11, 2024 · 3bbcab2 · 3bbcab2
1 parent 6b2ed08
commit 3bbcab2
Showing 1 changed file with 3 additions and 2 deletions.
diff --git a/xarray/core/common.py b/xarray/core/common.py
@@ -1110,9 +1110,10 @@ def _resample(
                 loffset=loffset,
                 base=base,
             )
-        else:
-            assert isinstance(freq, Resampler)
+        elif isinstance(freq, Resampler):
             grouper = freq
+        else:
+            raise ValueError("freq must be a str or a Resampler object")
 
         rgrouper = ResolvedGrouper(grouper, group, self)