Python 找出学生总数

我有一个名为StudentBody的父类和一个名为MathStudentBody的子类。我的问题是，我如何解释儿童班，以便找出班上的学生总数？我想我们必须找出创建的对象的总数？谁能给我指一下正确的方向吗

class StudentBody:

    count = 0
    def __init__(self, name,gender,year,gpa):
        self.name = name
        self.gender = gender
        self.year = year
        self.gpa = gpa
        self.count+= 1

    def IsFreshman(self):
        print "I am the StudentBody method"
        if self.year == 1:
            return True
        else :
            return False

    def countTotal(self):
        return self.count

class MathStudentBody(StudentBody):

    def __init__(self,name,gender,year,gpa,mathSATScore):
        #super(MathStudentBody,self).__init__(name,gender,year,gpa)
        StudentBody.__init__(self,name,gender,year,gpa)
        self.MathSATScore = mathSATScore

    def IsFreshman(self):
        print "I am the MathStudentBody method"


    def CombinedSATandGPA(self):
        return self.gpa*100 + self.MathSATScore

    def NumberOfStudents(self):
        return

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你的意思是像这样把你的代码精简到最低限度

class StudentBody:
    count = 0
    def __init__(self):
        StudentBody.count+= 1

class MathStudentBody(StudentBody):
    count = 0
    def __init__(self):
        super().__init__()                        # python 3
        # super(MathStudentBody, self).__init__() # python 2
        MathStudentBody.count+= 1

s = StudentBody()
ms = MathStudentBody()

print(StudentBody.count)  # 2
print(MathStudentBody.count) # 1

请注意，我将对类变量的访问权限从self.count更改为StudentBody.count，如果您是只读的，则可以使用self.count。但是，一旦您将某些内容分配给self.count，更改只会影响实例self，而不会影响类。在MathStudentBody中调用super.\uuuuu init\uuuuu也会增加StudentBody.count

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。。。咯咯笑

在您的代码中，您将self.count+=1，这不会失败吗？@WillemVanOnsem:不会，这将只访问StudentBody.count。