Python练习题

Posted 2020-09-27

一、元素分类

有如下值集合 [11,22,33,44,55,66,77,88,99,90...]，将所有大于 66 的值保存至字典的第一个key中，将小于 66 的值保存至第二个key的值中。
即： {‘k1‘: 大于66的所有值, ‘k2‘: 小于66的所有值}

l = [11,22,33,44,55,66,77,88,99,90]
ls1 = []
ls2 = []
for i in l:
    if i > 66:
        ls1.append(i)
    else:
        ls2.append(i)
print({‘k1‘:ls1,‘k2‘:ls2})

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二、查找

查找列表中元素，移除每个元素的空格，并查找以 a或A开头 并且以 c 结尾的所有元素。

    li = ["alec", " aric", "Alex", "Tony", "rain"]

    tu = ("alec", " aric", "Alex", "Tony", "rain") 

    dic = {‘k1‘: "alex", ‘k2‘: ‘ aric‘,  "k3": "Alex", "k4": "Tony"}

li = ["alec", " aric", "Alex", "Tony", "rain"]
for i in li:
    l = i.strip()
    if (l.startswith(‘a‘) or l.startswith(‘A‘)) and l.endswith(‘c‘):
        print(l)

tu = ("alec", " aric", "Alex", "Tony", "rain")
for i in tu:
    l = i.strip()
    if (l.startswith(‘a‘) or l.startswith(‘A‘)) and l.endswith(‘c‘):
        print(l)

dic = {‘k1‘: "alex", ‘k2‘: ‘ aric‘,"k3": "Alex", "k4": "Tony"}
for key in dic:
    value1 = dic[key].strip()
    if (value1.startswith(‘a‘) or value1.startswith(‘A‘)) and value1.endswith(‘c‘):
        print(value1)

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三、输出商品列表，用户输入序号，显示用户选中的商品

    商品 li = ["手机", "电脑", ‘鼠标垫‘, ‘游艇‘]

li = ["手机", "电脑", ‘鼠标垫‘, ‘游艇‘]
l = []
for i in enumerate(li,1):
    l.append(i)
    user_choose = input(‘请输入你想要购买的商品序号: ‘)
    if not user_choose.isdigit():continue
    print(l[int(user_choose)-1][1])

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四、简单购物车

　　实现打印商品详细信息，用户输入商品和购买个数，则将商品名，价格，购买个数加入购物列表，如果输入为空或其他非法输入，则要求用户重新输入

for key in msg_dic:
    print(key, msg_dic[key])
while True:
        my_goods = input(‘请输入你想要购买的商品： ‘)
        if my_goods not in msg_dic:continue
        my_count = input(‘请输入你想要购买的商品个数： ‘)
        if  not my_count.isdigit():continue
        print((my_goods,msg_dic[my_goods],my_count))
        break

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