+
−students = {
+
−    'Madhu': 12,
+
−    'Shantanu':45,
+
−    'Puneeth': 54,
+
−    'Vattam': 35,
+
−    'KD': 50,
+
−    }
+
−
+
−all_marks = students.values()
+
−unique_marks = set(all_marks)
+
−
+
−print "Number of Duplicate marks: ", len(all_marks) - len(unique_marks)
+
−print "Duplicate marks: ", set(all_marks - list(unique_marks))