Python class给出错误Traceback

Question

对不起，可能是一个愚蠢的问题，但我是非常非常新的python和创建我的第一个类之一。但它给错误，我有点无知。下面是代码

class Student: 
    studentCount = 0 
    averageGPA = 0 

    def __init__(self, studentID, studentName, studentGPA): 
     self.studentID = studentID 
     self.studentName = studentName 
     self.studentGPA = studentGPA 
     Student.studentCount += 1 
     Student.averageGPA += 3 

    def displayCount(self): 
     print ("Total Students %d" % Student.studentCount) 

    def displayStudent(self): 
     print ("ID : ", self.studentID, ", Name : ", self.studentName, ", GPA : ", self.studentGPA) 
    def averageGPA(self): 
     print("Average GPA is : %d" % Student.averageGPA/Student.studentCount) 

def main(): 
    student1 = Student("54466","Zara", 3) 
    student2 = Student("48887","Manni", 4) 
    student3 = Student("41187","Sam", 3) 
    student1.displayStudent() 
    student2.displayStudent() 
    print ("Total Students %d" % Student.studentCount) 
    print ("Student's average GPA %d" % Student.averageGPA) 

main() 

，它是给错误是

Traceback (most recent call last): 
    File "Z:/CS 120/lab7_2.py", line 29, in <module> 
    main() 
    File "Z:/CS 120/lab7_2.py", line 21, in main 
    student1 = Student("54466","Zara", 3) 
    File "Z:/CS 120/lab7_2.py", line 10, in __init__ 
    Student.averageGPA += 3 
TypeError: unsupported operand type(s) for +=: 'function' and 'int' 

请帮我解决这个问题。再次抱歉，如果这个问题听起来很愚蠢，因为我很新！

Answer 1

你是通过gpa作为字符串：是否有理由这样做。它会更好，如果你这样做：

student1 = Student("54466","Zara", 3) 

正如其他人也是AverageGPA是一个方法的名字说，所以你需要的类属性的另一个名称。

你也可能会发现你的平均就会出来错的，如果你正在使用Python 2.7