冒泡排序-python

source program:

list=[]
while True:
    print("how many number input:")
    try:
        num=int(input())
        for i in range(num):
            a=int(input("input"+str((i+1))+"integer:"))
            list.append(a)
    except ValueError:
        print("error!")

    for j in range(len(list)-1):
        for k in range(len(list)-1):
            if list[k]<list[k+1]:
                t=list[k]
                list[k]=list[k+1]
                list[k+1]=t
    print(list)