Fixed minor formatting error while raising exception at function compile time.

theano/compile/function_module.py

@@ -462,9 +462,11 @@ class Function(object):
                 try:
                     s = finder[item]
                 except KeyError:
-                    raise TypeError("Unknown input or state: %s" % item)
+                    print item
+                    raise TypeError("Unknown input or state: %s" % str(item))
                 if s is DUPLICATE:
-                    raise TypeError("Ambiguous name: %s - please check the names of the inputs of your function for duplicates." % item)
+                    raise TypeError("Ambiguous name: %s - please check the names '\
+                        'of the inputs of your function for duplicates." % str(item))
                 if isinstance(s, gof.Container):
                     return s.value
                 else:
@@ -475,9 +477,10 @@ class Function(object):
                 except KeyError:
                     # Print informative error message.
                     msg = get_info_on_inputs(named_inputs, n_unnamed_inputs)
-                    raise TypeError("Unknown input or state: %s. %s" % (item, msg))
+                    raise TypeError("Unknown input or state: %s. %s" % (str(item), msg))
                 if s is DUPLICATE:
-                    raise TypeError("Ambiguous name: %s - please check the names of the inputs of your function for duplicates." % item)
+                    raise TypeError("Ambiguous name: %s - please check the names '\
+                        'of the inputs of your function for duplicates." % str(item))
                 if isinstance(s, gof.Container):
                     s.value = value
                     s.provided += 1