TypeError：updateCourses（）缺少1个必需的位置参数：'self'

Question

=============================================== ==========================

def updateCourses(self, name = '', hours = 0, grade = ''):

      gradeDict = {'A': 4, 'A-': 3.7, 'B+': 3.3, 'B': 3, 'B-': 2.7, 'C+' :            2.3,\
                    'C': 2, 'C-': 1.7, 'D+': 1.3, 'D': 1, 'D-': 0.7, 'F': 0}

      course = {}
      course['name'] = name
      course['hours'] = hours
      course['grade'] = grade

      self.courses.add(course)

      if not name:
         name = input("Enter course number:")
         print(name)

      if not hours:
         hours = int(input("Enter hours for:", name))
         print(hours)

      if not grade:
         grade = input("Enter hours for:", name).upper()
         print(grade)
         score = gradeDict[grade]

      course = (name, hours, grade, score)
      self.classList.append(course)

      self.totalHours += hours
      self.qualityPoints += hours * score
      self.GPA = self.qualityPoints / self.totalHours

抱歉，我是新手。它返回“Traceback（最近一次调用最后一次）：

File "C:\Users\Abee\Desktop\GCSE\test.py", line 157, in <module>
addCourses(studentList)
File "C:\Users\Abee\Desktop\GCSE\test.py", line 111, in addCourses
Student.updateCourses()
TypeError: updateCourses() missing 1 required positional argument: 'self' thanks for helping me