remove space before first arg in python output (fixes #34)

output.py

@@ -139,7 +139,7 @@ def function_header(self, o, arg_repr, arg_kinds, pre_args_func=None,
                     # Remove spaces before the first argument name. Generally
                     # spaces are only present after a type, and if we erase the
                     # type, we should also erase also the spaces.
-                    n = re.sub(' +([a-zA-Z0-9_])$', '\\1', n)
+                    n = re.sub(' +([a-zA-Z0-9_]+)$', '\\1', n)
                 self.string(n)
             if i < len(arg_repr.assigns):
                 self.token(arg_repr.assigns[i])