Clarify error message (pydata#2078)

rdrussotto · Jul 13, 2019 · 4099cc2 · 4099cc2
1 parent 6586c26
commit 4099cc2
Showing 1 changed file with 3 additions and 3 deletions.
diff --git a/xarray/core/computation.py b/xarray/core/computation.py
@@ -482,9 +482,9 @@ def broadcast_compat_data(variable, broadcast_dims, core_dims):
     missing_core_dims = [d for d in core_dims if d not in set_old_dims]
     if missing_core_dims:
         raise ValueError(
-            'operand to apply_ufunc has required core dimensions %r, but '
-            'some of these are missing on the input variable:  %r'
-            % (list(core_dims), missing_core_dims))
+            'operand to apply_ufunc has required core dimensions {}, but '
+            'some of these are missing on an input variable: {}'.format(
+            list(core_dims), missing_core_dims))
 
     set_new_dims = set(new_dims)
     unexpected_dims = [d for d in old_dims if d not in set_new_dims]