FIX: guard signature import better

tacaswell · tacaswell · commit 1c9feb824837 · 2015-09-11T00:03:22.000-04:00
diff --git a/lib/matplotlib/__init__.py b/lib/matplotlib/__init__.py
@@ -1603,8 +1603,9 @@ def param(func):
             else:
                 python_has_signature = True
         else:
-            signature = inspect.signature
-            Parameter = inspect.Parameter
+            if python_has_signature:
+                signature = inspect.signature
+                Parameter = inspect.Parameter
 
         if not python_has_signature:
             arg_spec = inspect.getargspec(func)
