綁定，反射，內置函數

#綁定方法:綁定給誰就應該誰來調用，誰來調用就會把誰當做第一個參數自動傳入
import  setting   #配置文件為setting

class  mysql:
    def __init__(self,host,port):   #綁定到對象
        self.host=host
        self.port=port

    @classmethod     #綁定到類
    def from_conf(cls):
        return cls(setting.HOST,setting.PORT)

    @staticmethod  #不與類也不與對象綁定
    def creat_id():
        n=eroos
        return n

con=mysql.from_conf()
print(con.port,con.host)
com=mysql.creat_id()
print(com.create_id)

#反射  通過字符串來操作對象或者類的屬性 1.hasattr  2.setattr 3.getattr 4.delattr
class foo:
    def __init__(self,name):
        self.name=name

    def f1(self):
        print('f1')

obj=foo('abc')

#hasattr()  判斷
print(hasattr(obj,'name'))
print(hasattr(obj,'f1'))

#getattr  調用
if hasattr(obj,'f1'):
    f=getattr(obj,'f1')
    #print(f)   
    f()

#setattr()  修改
obj.x=1
setattr(obj,'x',2)
print(obj.__dict__)

#delattr 刪除
#del obj.name
delattr(obj,'name')
print(obj.__dict__)

class fprser:
    def __init__(self,host,port):  
       self.host=host
       self.port=port
       self.conn='xxx'
    def intera(self):
       while True:
           cmd=input('>>: ').strip()
           if not cmd:continue
           cmd_l=cmd.split() 
           print(cmd_l) 
           if hasattr(self,cmd_l[0]):
              func=getattr(self,cmd_l[0])
              func(cmd_l)

    def get(self,cmd_l):
        print('geting......',cmd_l)

    def put(self,cmd_l):
        print('puting...',cmd_l)

client=fprser('2.2.2.2',23)        
client.intera()

#內置函數
isinstance() #判斷一個對象是不是某個類型的
l=list([])
print(isinstance(l,list))

issubclass() #判斷是不是某個的子類
class foo:
    pass
class bar(foo):
    pass
print(issubclass(bar,foo))

#__str__ #打印時觸發，默認打印內存地址
class foo:
    def  __init__(self,name,age):  #初始化時觸發
        self.name=name
        self.age=age

    def __str__(self):  ##打印時觸發
        return <__main__,.......>  #可以修改打印自己需要的
conf=foo('abc',38)
print(conf)  #print(abc.__str__())

#__del__ 回收之后在打印del
class foo:
    def __del__(self):
        print('del....')

obj=foo()
print('123')

class foo:
    def __del__(self):
        print('del....')

obj = foo()
del obj
print('123')