定义一个函数func(*argvs),该函数效果如下
func(222,111,‘xian’,‘hahaah’) --> 'xian'
func (7,'name','fensi') --> 'fensi'
func(1,2,3,4) ---> None
def func(*args): if not isinstance(args[2],int): return args[2] else: return None li = [222,111,'xian','hahaah'] li1 = [7,'name','fensi'] li2 = [1,2,3,4] print func(*li) print func(*li1) print func(*li2)