+−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))