Fix wrong syntax for assert

Andrea Bedini · Andrea Bedini · commit 25bee51dd41e · 2013-08-23T10:43:48.000+10:00
The assert statement doesn't take parentheses, see http://docs.python.org/3.2/reference/simple_stmts.html#assert http://docs.python.org/2/reference/simple_stmts.html#grammar-token-assert_stmt I found this because python gave me the following ```SyntaxWarning: assertion is always true, perhaps remove parentheses?```
diff --git a/lib/matplotlib/docstring.py b/lib/matplotlib/docstring.py
@@ -33,8 +33,8 @@ def some_function(x):
         "%s %s wrote the Raven"
     """
     def __init__(self, *args, **kwargs):
-        assert (not (args and kwargs),
-                "Only positional or keyword args are allowed")
+        assert not (args and kwargs), \
+                "Only positional or keyword args are allowed"
         self.params = args or kwargs
 
     def __call__(self, func):
