def main(): Course1=Course('Data Structures') Course2=Course('Database System') Course1.addStudent('Peter Wang') Course1.addStudent('Brian Li') Course1.addStudent('Anne Wu') Course2.addStudent('Peter Sun') Course2.addStudent('Steve Cai') print ('number of students in Course1: ', Course1.getNumOfStudents()) students=Course1.getStudents() for student in students: print (student,end=', ') print ('\nnumber of students in Course2: ',Course2.getNumOfStudents())