Python：如何将列表添加到 class 和 append 中

Question

I am trying to add a class Department and in this class, "courses" is supposed to be a list that I can add to with the add_course function. Is there a way to tell python that "courses" is a list and then use .append to add new courses to this list?

class Department:
    def __init__(self, name, code, courses):
        self.name = name
        self.code = code
        self.courses = courses
        courses.tolist()

    def add_course(self, course): 
        self.course = course
        courses.append(course)

Answer 1

Assuming that you will always be passing in courses, you could try this:

class Department:
    def __init__(self, name, code, courses=None):
        self.name = name
        self.code = code
        if isinstance(courses, list):
            self.courses = courses
        elif courses is None:
            self.courses = []
        else:
            raise TypeError

    def add_course(self, course): 
        self.courses.append(course)