面向对象和类

# 1.类的属性class cat:    name = '布偶'    age = 9p1 = cat  # 这是一个cat类print(p1)print(p1.name)p2 = cat()  # 这是一个cat对象print(p2)print(p1.name)p3 = catp3.name = '毛线'  # 属性会优先找对象，对象没有才会去类找print(p2.name)print(p2.__dict__)  # {}   __dict__获取对象的字典信息print(p2.__class__)  # 查看类型print(cat.__dict__)# 2.初始化属性class Teacher:    school = "oldboy"    # def init(obj, name, age):    #     obj.name = name    #     obj.age = age    def __init__(self, name, age):        print(self)        self.name = name        self.age = aget1 = Teacher("jack", 18)print(t1.name)print(t1)# 3.行为定制class Student:    school = "oldgirl"    def __init__(self, name, age, gender):        self.name = name        self.age = age        self.gender = gender    # def study(self):    #     print(self)    def say_hi(self):        # print(self)        print("hello i am a student! my name:%s" % self.name)    def a(self):        picklestu1 = Student("jack", 20, "male")  # 这是一个对象stu2 = Student("rose", 18, "female")# stu1.say_hi()# stu2.say_hi()# print(stu1)# stu2.say_hi() # 对象调用函数# Student.say_hi(stu1) # 类调用函数print(type(Student.say_hi))print(type(stu1.say_hi))# 4.类绑定方法class OldBoyStudent:    school = "oldboy"    def __init__(self,name):        self.name = name    @classmethod    # 类绑定方法    def show_school(cls):        # print(self.school)        print(cls)    @staticmethod # 看成普通函数    def print_hello():        print("hello world")