python之类与对象属性的增删改查

类属性与对象属性的增删改查

类属性的增删改查

class School:
    """
    文档
    """ Teacher = "老王"
　　 def __init__(self,name):
 　　self.name = name def Examination(self): print("%s的班级正在考试"%self) p1 = School("小李") '''类数据属性的增删改查 查 print(School.Teacher) 改 School.Teacher="老李" print(School.Teacher) 增 School.foo ="小孙" print(School.__dict__) 删 del School.foo print(School.__dict__) ''' #类函数属性的增删改查同实例属性 def eat_food(self,food): print("正在吃") School.eat = eat_food print(School.__dict__) School.eat

对象(实例)属性的增删改查

class Chinese:
    country = "china"
    def __init__(self,name): self.mingzi = name def play_ball(self,ball): print("%s 正在打 %s"%(self.mingzi,ball)) p1 = Chinese("alex") print(p1.__dict__) #查 print(p1.mingzi) p1.play_ball("篮球")#实际上是调用类的函数属性 #增 p1.age = 18 print(p1.__dict__) #改 p1.age = 29 print(p1.__dict__) #删 del p1.age print(p1.__dict__)

小结

注意：点的方式调用要么跟类有关,要么跟实例有关,不加点调用就是普通变量

#点的方式调用要么跟类有关,要么跟实例有关,不加点调用就是普通变量
country = "中国"
class Chinese: country = "china" l = ["a","b"] def __init__(self,name): self.mingzi = name def play_ball(self,ball): print("%s 正在打 %s"%(self.mingzi,ball)) p1 = Chinese("alex") p1.country = "老王" #属于给实例化新增一个字典,不影响类的字典 print(Chinese.country) print(p1.country) p1.l.append("c") #属于调用类的属性,与实例化无关 print(Chinese.l) print(p1.l) print(p1.__dict__)#实例化字典中没有l