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}
li = [11, 22, 33, 44, 55, 66, 77, 88, 99, 90]
a = {"k1":[], "k2":[]}
for i in li:
if i > 66:
a["k1"].append(i)
elif i == 66:
pass
elif i < 66:
a["k2"].append(i)
print(a)=======>{'k1': [77, 88, 99, 90], 'k2': [11, 22, 33, 44, 55]}
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"}
for i in li:
b = i.strip()
if (b.startswith("a") or b.startswith("A")) and b.endswith("c"):
print(b)
for i1 in tu:
b1 = i1.strip()
if (b1.startswith("a") or b1.startswith("A")) and b1.endswith("c"):
print(b1)
for i2 in dic.values():
b3 = i2.strip()
if (b3.startswith("a") or b3.startswith("A")) and b3.endswith("c"):
print(b3)
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']
for k, v in enumerate(li, 1):===>先排序
print(k, v)
inp = int(input("请输入序号:"))====>然后输入号码
print(li[inp - 1])
四、购物车
功能要求：
- 要求用户输入总资产，例如：2000
- 显示商品列表，让用户根据序号选择商品，加入购物车
- 购买，如果商品总额大于总资产，提示账户余额不足，否则，购买成功。
- 附加：可充值、某商品移除购物车
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goods = [ {"name": "电脑", "price": 1999}, {"name": "鼠标", "price": 10}, {"name": "游艇", "price": 20}, {"name": "美女", "price": 998},] |
goods = [{"name": "电脑", "price": 1999},
{"name": "鼠标", "price": 1},
{"name": "游艇", "price": 2},
{"name": "美女", "price": 998}]
account = []
sample = 2000
s = 0
#显示商品列表代码：
print("序号 ","name ","price ")
for i,v in enumerate(goods, 0):
print(i," ", v["name"], " ", v["price"], " ")
'''
序号 name price
0 电脑 1999
1 鼠标 1
2 游艇 2
3 美女 998
'''
item = []
sample = 2000
s = 0
index = []
while True:
inp = int(input("请输入序号").strip())
if inp < len(goods) and inp >= 0:
item1 = goods[inp]
money = item1["price"]
item.append(item1)
index.append(inp)
print(goods[inp]["name"], goods[inp]["price"], "已加入购物车")
s = s + money
if s <= sample:
print(goods[inp]["name"], goods[inp]["price"], "购买成功")
else:
a = s - sample
b = "差" + str(a) + "元"
print("余额不足", b)
while True:
inp1 = input("请输入充值/移除:")
if inp1 == "充值":
inp2 = input("充值金额：")
sample += inp2
if sample >= s:
print("购买成功")
break
else:
c = "差" + str(s - sample) + "元"
print("余额不足", c)
elif inp1 == "移除":
while True:
inp3 = int(input("移除商品序号："))
if inp3 in index:
item.remove(goods[int(inp3)])
index.remove(inp3)
s = s - goods[int(inp3)]["price"]
if s > sample:
d = "差" +str(s - sample) +"元"
print("余额不足", d)
else:
print("购买成功")
break
else:
print("移除错误")
else:
print("无此商品")
五、用户交互，显示省市县三级联动的选择
dic = {"河北":
{"石家庄": ["鹿泉", "藁城", "元氏"],"邯郸": ["永年", "涉县", "磁县"]},
"河南": {},
"山西": {}
}
分析：
首先需要显示省份，
比如显示石家庄 dic["河北"]，
比如显示"鹿泉", "藁城", "元氏" dic["河北"]["石家庄"]
代码如下：
for a in dic.keys():
print(a)======>显示省份
province = input("请输入省份：")===>选择输入省份
for b in dic[province].keys():
print(b)
city = input("请输入城市")
for c in dic[province][city]:
print(c)