python题

购物车
car=[]
lists=[['水果',['梨','苹果']],['日用百货',['卫生纸','毛巾']]]
flag='t'
while 1:
    if flag=='f':
        print(car)
        break
    n = 0
    for a,b in lists:
        n=n+1
        print(n,a)
    m=0
    num=int(input('请输入(0结算退出):'))-1
    if num==-1:
        flag='f'
        continue
    for i in lists[num][1]:
        m=m+1
        print(m,i)
    while 1:
        num1=int(input('请输入货物编号(0结算退出,-1返回)'))-1
        if num1==-2:
            break
        if num1==-1:
            flag='f'
            break
        g=lists[num][1][num1]
        car.append(g)
前两个数相加等于下一个
a=0
b=1
for i in range(0,20):
    a,b=b,a+b
    print(a)
冒泡排序
list=[12,23,52,41,64,22,20]
for j in range(len(list)-1):
    flag='t'
    for i in range(len(list)-j-1):
        if list[i]>list[i+1]:
            list[i],list[i+1]=list[i+1],list[i]
            flag='f'
    if flag=='t':
        break
    print(list)