웹 파이선 프로그래밍

class Student:

    countStudent = 0

    def __init__(self, givenId, givenName):

        self.id = givenId

        self.name = givenName

        Student.countStudent = Student.countStudent + 1

    def setID(self, givenId):

        self.id = givenId

    def getID(self):

        return self.id

    def setName(self, givenName):

        self.name = givenName

    def getName(self):

        return self.name

    def __str__(self):

        msg = "id:{}","name:{}".format(self.id, self.name)

        return msg

    def getNumOfStudent():

        return Student.countStudent

print(Student.getNumOfStudent())

student1 = Student(20190001, "Harry Potter")

student2 = Student(20190002, "Hermione Granger")

print(student1)

print(student2)

print(Student.getNumOfStudent())

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같은 코드를 입력했는데 이런 오류가 뜹니다 

어느 부분이 잘못 된건가요?

감사합니다.