# -*- coding:utf-8 -*-
class Teacher:
    def __init__(self,name,birthday,sex,cource):
        self.name = name
        self.birthday = birthday
        self.sex = sex
        self.cource = cource
class Cource:
    def __init__(self,course_name,period,price):
        self.course_name = course_name
        self.period = period
        self.price = price
class Birthday:
    def __init__(self,year,month,day):
        self.year = year
        self.month = month
        self.day = day

b = Birthday(2019,1,16)
c = Cource('python',6,800000)

zhang = Teacher('张老师',b,'男',c)
print(zhang.birthday.year)  #可以通过zhang(对象)-(Teacher类)调用 Birthday里的属性
print(zhang.cource.price)   #可以通过zhang(对象)-(Teacher类)调用 Cource里的属性