Python 类给出错误 Traceback

Question

对不起，也许是一个愚蠢的问题，但我对 python 非常陌生，并创建了我的第一堂课。但它给出错误，我有点无能为力。这是代码

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()

它给出的错误是

    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

您将 gpa 作为字符串传递：是否有理由这样做。如果你这样做会更好：

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

正如其他人所说，AverageGPA 是方法的名称，因此您需要为类属性取另一个名称。

另外，如果您使用 Python 2.7，您可能会发现您的平均值会出错