经典案例【Python】

dic = {
    ‘植物‘: {‘草本植物‘:
               [‘冬播‘, ‘春播‘, ‘二月兰‘, ‘紫罗兰‘, ‘洋葱‘, ‘小麦‘],
           ‘木本植物‘:
               [‘松‘, ‘彬‘, ‘樟树‘, ‘乔木‘],
           ‘藤本本植‘:
               [‘扁豆‘, ‘牵牛花‘, ‘芸豆‘, ‘爬山虎‘]
           },
    ‘动物‘: {‘两栖动物‘:
               [‘蛙类‘, ‘蟾蜍‘, ‘大鲵‘],
           ‘哺乳类动物‘:
               [‘猫‘, ‘狗‘, ‘猪‘],
           ‘爬行动物‘:
               [‘鳄鱼‘, ‘蛇‘, ‘大螃蟹哈哈‘, ‘知了‘]
           },
}
li = []
go = True
while go:
    for i, v in enumerate(dic, 1):
        print(i, v)
        li.append(v)
    u_c = str(input(‘>>>‘))
    if u_c.isdigit():
        u_c = int(u_c)
        li1 = []
        while go:
            for i, v in enumerate(dic[li[u_c - 1]], 1):
                print(i, v)
                li1.append(v)
            u_c1 = input(‘>>>‘)
            u_c1 = int(u_c1)
            while go:
                for i in dic[li[u_c - 1]][li1[u_c1 - 1]]:
                    print(i)
                u_c2 = str(input(‘>>>‘))
                u_c2 = u_c2.lower()
                if u_c2 == ‘b‘:
                    li1.clear()
                    # del li[:] 都是清空的意思
                    break
                elif u_c2 == ‘q‘:
                    go = False
                    break
    elif u_c.isalpha():
        u_c.lower()
        if u_c == ‘i‘:
            lx = input(‘类型:‘)
            if dic.get(lx, 1) == 1:
                dic[lx] = {}
            zl = input(‘种类‘)
            if dic[lx].get(zl, 1) == 1:
                dic[lx][zl] = []
            while True:
                mc = input(‘名称‘)
                if mc == ‘q‘:
                    li.clear()
                    break
                if mc in dic[lx][zl]:
                    print(‘已经存在‘)
                else:
                    dic[lx][zl].append(mc)