Probably better this way.

none · none · commit 172893dda9d5 · 2015-08-04T21:55:56.000+02:00
diff --git a/lib/mpl_toolkits/axes_grid1/parasite_axes.py b/lib/mpl_toolkits/axes_grid1/parasite_axes.py
@@ -487,7 +487,7 @@ def host_axes(*args, **kwargs):
     import matplotlib.pyplot as plt
     axes_class = kwargs.pop("axes_class", None)
     host_axes_class = host_axes_class_factory(axes_class)
-    if "figure" in kwargs:
+    if kwargs.get("figure") != None:
         fig = kwargs["figure"]
     else:
         fig = plt.gcf()
@@ -500,7 +500,7 @@ def host_subplot(*args, **kwargs):
     import matplotlib.pyplot as plt
     axes_class = kwargs.pop("axes_class", None)
     host_subplot_class = host_subplot_class_factory(axes_class)
-    if "figure" in kwargs:
+    if kwargs.get("figure") != None:
         fig = kwargs["figure"]
     else:
         fig = plt.gcf()
