Merge pull request matplotlib#2425 from mdboom/axis-off-extra

DOC: `axis_off` wrongfuly appears as a parameter to Figure.add_subplot

Author: mdboom

lib/matplotlib/artist.py

@@ -1,6 +1,7 @@
 from __future__ import division, print_function
 import re
 import warnings
+import inspect
 import matplotlib
 import matplotlib.cbook as cbook
 from matplotlib import docstring, rcParams
@@ -948,6 +949,8 @@ def _get_setters_and_targets(self):
             o = getattr(self.o, name)
             if not callable(o):
                 continue
+            if len(inspect.getargspec(o)[0]) < 2:
+                continue
             func = o
             if self.is_alias(func):
                 continue