反射

反射
hasattr(obj,name_str) , 判断一个对象obj里是否有对应的name_str字符串的方法
getattr(obj,name_str), 根据字符串去获取obj对象里的对应的方法的内存地址
setattr(obj,'y',z), is equivalent to ``x.y = v''
delattr

def bulk(self):
print("%s is yelling...." %self.name)

class Dog(object):
def __init__(self,name):
self.name = name

def eat(self,food):
print("%s is eating..."%self.name,food)

d = Dog("AAA")
choice = input(">>:").strip()

if hasattr(d,choice):
getattr(d,choice)
else:
setattr(d,choice,bulk) #d.talk = bulk
func = getattr(d, choice)
func(d)