more explicit errors.

theano/scalar/basic.py

@@ -370,8 +370,8 @@ class ScalarOp(Op):
     def make_node(self, *inputs):
         if self.nin >= 0:
             if len(inputs) != self.nin:
-                raise TypeError("Wrong number of inputs for %s.make_node (got %i, expected %i)" \
-                                    % (self, len(inputs), self.nin))
+                raise TypeError("Wrong number of inputs for %s.make_node (got %i(%s), expected %i)" \
+                                    % (self, len(inputs), str(inputs), self.nin))
         inputs = [as_scalar(input) for input in inputs]
         outputs = [t() for t in self.output_types([input.type for input in inputs])]
         if len(outputs) != self.nout: