python学习笔记-Day7

class Province:
 
    # 静态字段（类变量/属性）
    country ＝ '中国'
 
    def __init__(self, name):
 
        # 普通字段（实例变量/属性）
        self.name = name
 
# 直接访问普通字段
obj = Province('河北省')
print obj.name
 
# 直接访问静态字段
Province.country
复制代码

class Animal:
    def __init__(self, name):    # Constructor of the class
        self.name = name
        self.__num = None #私有化变量，不允许外部访问
    hobbie = 'meat'
 
    @classmethod #类方法，不能访问实例变量
    def talk(self):
        print('is hobbie %s'%self.hobbie)
 
    @staticmethod #静态方法，不能访问类变量和实例变量
    def walk(self):
        print('is walk %s'%self.hobbie)
 
    @property #把方法变为属性
    def habit(self):
        print("%s habit is " %self.name)
    @property
    def total_player(self):
        return self.__num
 
    @total_player.setter # 修改属性
    def total_player(self,num):
        self.__num = num
        print("total num:%s"%self.__num)
 
    @total_player.deleter # 删除
    def total_player(self):
        print("total player got deleted")
        del self.__num
 
d = Animal("anonymous")
print(d.total_player)
d.total_player = 3 #直接穿变量
d.__num = 9
print("Out:",d.__num)
print("to access private variable:",d._Animal__num)
# del d.total_player
print("Inside:",d.total_player)

#广度优先 先从左向右找同级别，再找上一级 新式类 class name(object)
#深度优先，先找左面第一个，如果没有，找上级然后在返回同级找。旧式类 class name
 
class A(object):
    n = 'A'
    def f1(self):
 
        print("from A")
 
class B(A):
    n = 'B'
    def f1(self):
        print('from B')
 
class C(A):
    n = 'C'
    def f1(self):
        print("from C")
class D(B,C):
        pass
p = D()
p.f1()