Cant Assign to operator python : Why does cant assign to operator show up for this line `point * hours = QP`

> class Student(object):
    def __init__(self, name, surname, grade, hours, QP):
        self.name = name
        self.surname = surname
        self.grade = grade
        self.hours = hours
        self.QP = QP
    def getName(self):
        return '{}'.format(self.name)
    
    def getSurname(self):
        return '{}'.format(self.surname)
    
    def getGrade(self):
        return list(zip(self.grade, self.hours))
        
    def getHours(self):
        return '{}'.format(self.hours)
    def point(self):
        if grade == A:
            point = 4.0
        elif grade == B:
            point = 3.0
        elif grade == C:
            point = 2.0
        elif grade == D:
            point = 1.0
        else:
            point = 0.0

    def getQPoints(self):
        point * hours = QP
        return QP
    
    stud1 = Student("John","Brown",["A","B","A"],["15.0","25.0","20.0"],"")
    stud2 = Student("Mary","Watson",["C","A","B"],["15.0","25.0","20.0"],"")


    print (stud1.getQPoints())

