assert isinstance checks

jedi/helpers.py

@@ -92,7 +92,7 @@ class ExecutionRecursionDecorator(object):
         self.reset()
 
     def __call__(self, execution, evaluate_generator=False):
-        debug.dbg('Execution recursions: ', execution, self.recursion_level,
+        debug.dbg('Execution recursions: %s' % execution, self.recursion_level,
                             self.execution_count, len(self.execution_funcs))
         if self.check_recursion(execution, evaluate_generator):
             result = []