FIX: allow bottom-only call

jklymak · jklymak · commit b17826c31a22 · 2019-02-18T15:47:38.000-08:00
diff --git a/lib/matplotlib/projections/polar.py b/lib/matplotlib/projections/polar.py
@@ -1202,9 +1202,13 @@ def set_ylim(self, bottom=None, top=None, emit=True, auto=False,
                                  'argument and kwarg "ymax"')
             else:
                 top = ymax
-        if top is None and len(bottom) == 2:
-            top = bottom[1]
-            bottom = bottom[0]
+        if top is None:
+            try:
+                top = bottom[1]
+                bottom = bottom[0]
+            except TypeError:
+                # no top
+                super().set_ylim(bottom=bottom, emit=emit, auto=auto)
 
         return super().set_ylim(bottom=bottom, top=top, emit=emit, auto=auto)
 
