Include invalid order value in exception

pandas-dev · gfyoung · Feb 11, 2019 · Feb 9, 2019 · Feb 9, 2019 · Feb 9, 2019
commit c4f3b6df12d91bbacc15938423d03e69b867a3b7
diff --git a/pandas/core/missing.py b/pandas/core/missing.py
@@ -295,7 +295,8 @@ def _interpolate_scipy_wrapper(x, y, new_x, method, fill_value=None,
     elif method == 'spline':
         # GH #10633, #24014
         if order is None or (order <= 0):
-            raise ValueError("order needs to be specified and greater than 0")
+            raise ValueError("order needs to be specified and greater than 0; "
+                             "got order: {}".format(order))
         terp = interpolate.UnivariateSpline(x, y, k=order, **kwargs)
         new_y = terp(new_x)
     else: