FIX: let pandas IndexInt64 work for boxplot

jklymak · jklymak · commit 7f8290ea681c · 2019-02-11T13:48:31.000-08:00
diff --git a/lib/matplotlib/axes/_axes.py b/lib/matplotlib/axes/_axes.py
@@ -3925,6 +3925,7 @@ def dopatch(xs, ys, **kwargs):
             positions = list(range(1, N + 1))
         elif len(positions) != N:
             raise ValueError(datashape_message.format("positions"))
+        positions = np.array(positions)
 
         # width
         if widths is None:
