面向对象和类

# 1.类的属性
class cat:
    name = '布偶'
    age = 9


p1 = 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 = cat
p3.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 = age


t1 = 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):
        pickle


stu1 = 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 # 当作普通函数
    def print_hello():
        print("hello world")