hasattr(object,name)函数
判断一个对象里面是否有name属性或者name方法,返回bool值,有name属性(方法)返回True,否则返回False、
class function_demo(object): name = ‘demo‘ def run(self): return "hello function" functiondemo = function_demo res = hasattr(functiondemo,‘name‘) #True res = hasattr(functiondemo,‘age‘) #False print(res)
getattr(object,name[default])函数:
获取对象object的属性或者方法,如果存在则打印出来,如果不存在,打印默认值,默认值可以选
注意:如果返回的事对象的方法,则打印的结果是:方法的内存地址,如果需要运行这个方法,后面需要加上括号。
class function_demo(object): name = ‘demo‘ def run(self): return "hello function" functiondemo = function_demo() a = getattr(functiondemo,‘name‘) #demo a = getattr(functiondemo,‘age‘,18) #18 print(a)
setattr(object,name,values)函数
给对象的属性赋值,若属性不存在,先创建在赋值
class function_demo(object): name = ‘demo‘ def run(self): return "hello function" functiondemo = function_demo() res = hasattr(functiondemo,‘name‘) #True print(res) a = setattr(functiondemo,‘age‘,18) #None print(a) res1 = hasattr(functiondemo,‘age‘) #True print(res1)
原文:https://www.cnblogs.com/wdz1226/p/10596761.html