组合

'''
组合：
定义一个人的类，人有头，躯干，手，脚等数据属性，这几个属性又可以是通过一个类实例化的对象，这就是组合
用途：
1、做关联
2、小的组成大的
'''

class Hand:
   pass

class Head:
   pass

class Trunk:
   pass

class Foot:
   pass

class Person:
   def __init__(self, id_num, name):
      self.id_num = id_num
      self.name = name
      self.head = Head() # 这几个类实例化无需传参
      self.hand = Hand()
      self.trunk = Trunk()
      self.foot = Foot()

p1 = Person('123', 'alex')
# print(p1.__dict__) # 'head': <__main__.Head object at 0x0000020D5EA4ADC0>表示的是当前文件Head对象内存地址


class School:
   def __init__(self, name, addr, teacher):
      self.name = name
      self.addr = addr
      self.teacher = teacher # 传入的参数为实例化后的对象

class Course:
   def __init__(self, name, price, period, school, teacher):
      self.name = name
      self.price = price
      self.period = period
      self.school = school # 传入的参数为实例化后的对象
      self.teacher = teacher # 传入的参数为实例化后的对象

class Teacher:
   def __init__(self, name, jingyan):
      self.name = name
      self.jingyan = jingyan

t1 = Teacher('林海峰', '5年')
s1 = School('南京', 'oldboy', t1)
s2 = School('北京', 'oldboy', t1)
s3 = School('东京', 'oldboy', t1)

msg = {
   '1': s1,
   '2': s2,
   '3': s3,
}
d1 = {
   '1': '南京',
   '2': '北京',
   '3': '东京',
}
print(d1)
num = input('请输入数字选择校区：')
school_obj = msg[num]

name = input('课程名：')
price = input('课程费用：')
period = input('课程周期：')

c1 = Course(name, price, period, school_obj, t1)
print('课程%s属于%s学校%s校区由%s老师教学' % (c1.name, c1.school.addr, c1.school.name, c1.teacher.name))