Handle axis instances even if they don't have a __name__.

efiring · efiring · commit b6bdcd108637 · 2020-06-14T10:57:57.000-10:00
diff --git a/lib/matplotlib/ticker.py b/lib/matplotlib/ticker.py
@@ -695,7 +695,8 @@ def format_data_short(self, value):
         if isinstance(value, Integral):
             fmt = "%d"
         else:
-            if self.axis.__name__ in ["xaxis", "yaxis"]:
+            if (hasattr(self.axis, '__name__') and
+                    self.axis.__name__ in ["xaxis", "yaxis"]):
                 if self.axis.__name__ == "xaxis":
                     axis_trf = self.axis.axes.get_xaxis_transform()
                     axis_inv_trf = axis_trf.inverted()
