这（学生）是从哪里来的

Question

class Student:
    def __init__(self,name,age,grade): #giving the attributes
        self.name=name
        self.age=age
        self.grade=grade

    def get_grade(self):
        return self.grade

class Course:
    def __init__(self,lesson,max_student):#giving attributes
        self.lesson=lesson
        self.max_student=max_student
        self.students=[]

    def add_student(self,student):
        if len(self.students)<self.max_student:
            self.students.append(student) #append(student) from where
            #I don't get where the append(student) get the name from.
            #As above code did't use student.
            return True
        return False

s1=Student('Tim',19,95) #Naming the student
s2=Student('bill',19,75)
s3=Student('jill',19,65)

course1=Course('Math',2)
course1.add_student(s1) #Adding the Student to a list by appending
course1.add_student(s2)

print(course1.students[0].name)
#Will give Tim but how do i print them all at once
#instead of multiple print maybe like a [0:1] but got error

Answer 1

• append方法是Python的一部分。它是list类的一部分，因此所有列表都有此方法（以及其他方法）。检查docs。您在self.students = []行中将self.students设置为空的列表

• student变量来自add_student的参数，如您在此处指定的：def add_student(self,student)。因此，当您调用course1.add_student(s1)时，s1将在方法内student（因为对于类方法，第一个参数self始终是类实例本身，不必在调用中指定）