面向對象【三】類與對象的屬性的操做

python之類與對象屬性的增刪改查

 

類屬性與對象屬性的增刪改查

類屬性的增刪改查

class School:
    """
    文檔
    """
    Teacher = "老王"
　　 def __init__(self,name):
    　　self.name = name
    def Examination(self):
        print("%s的班級正在考試"%self)
p1 = School("小李")
'''類數據屬性的增刪改查
查
print(School.Teacher)
改
School.Teacher="老李"
print(School.Teacher)
增
School.foo ="小孫"
print(School.__dict__)
刪
del School.foo
print(School.__dict__)
'''
#類函數屬性的增刪改查同實例屬性
def eat_food(self,food):
    print("正在吃")
School.eat = eat_food
print(School.__dict__)
School.eat

對象(實例)屬性的增刪改查

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("籃球")#其實是調用類的函數屬性
#增
p1.age = 18
print(p1.__dict__)
#改
p1.age = 29
print(p1.__dict__)
#刪
del p1.age
print(p1.__dict__)

小結

注意：點的方式調用要麼跟類有關,要麼跟實例有關,不加點調用就是普通變量

#點的方式調用要麼跟類有關,要麼跟實例有關,不加點調用就是普通變量
country = "中國"
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" #屬於給實例化新增一個字典,不影響類的字典
print(Chinese.country)
print(p1.country)
p1.l.append("c") #屬於調用類的屬性,與實例化無關
print(Chinese.l)
print(p1.l)
print(p1.__dict__)#實例化字典中沒有l