用Python求一组列表中最大的两个值

def main(list): a , b = (list[0],list[1]) if list[0] > list[1] else (list[1],list[0]) for i in range(2,len(list)): if list[i] > list[0]: b = a a = list[i] elif list[i] > list[1]: b =list[i] return a,b print(main([3,2,5,9]))