Update inputs.py

Author: bit

haystack/inputs.py

@@ -21,7 +21,7 @@ def __init__(self, query_string, **kwargs):
         self.kwargs = kwargs
 
     def __repr__(self):
-        return u"<%s '%s'>" % (self.__class__.__name__, self.__str__())
+        return u"<%s '%s'>" % (self.__class__.__name__, self)
 
     def __str__(self):
         return force_text(self.query_string)