绑定，反射，内置函数

#绑定方法:绑定给谁就应该谁来调用，谁来调用就会把谁当做第一个参数自动传入 import setting #配置文件为setting class mysql: def __init__(self,host,port): #绑定到对象 self.host=host self.port=port @classmethod #绑定到类 def from_conf(cls): return cls(setting.HOST,setting.PORT) @staticmethod #不与类也不与对象绑定 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 通过字符串来操作对象或者类的属性 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() 判断 print(hasattr(obj,'name')) print(hasattr(obj,'f1')) #getattr 调用 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 删除 #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() #内置函数 isinstance() #判断一个对象是不是某个类型的 l=list([]) print(isinstance(l,list)) issubclass() #判断是不是某个的子类 class foo: pass class bar(foo): pass print(issubclass(bar,foo)) #__str__ #打印时触发，默认打印内存地址 class foo: def __init__(self,name,age): #初始化时触发 self.name=name self.age=age def __str__(self): ##打印时触发 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')