练习题
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}
dic= {
"k1":[],
"k2":[]
}
li= [11,22,33,44,55,66,77,88,99,90]
for i in li:
if i<=66:
dic["k1"].append(i)
else:
dic["k2"].append(i)
print (dic)
1.元素分类答案
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_1=[]
s=0
for i in li:
ret=i.strip() #去掉空格
ret=ret.capitalize() #将首字母变成大写
start=ret.startswith("A")
end=ret.endswith("c")
if start==True and end ==True:
li_1.append(li[s])
else:
pass
s+=1
t=0
for i in tu:
ret=i.lstrip() #去掉空格
ret=ret.capitalize() #将首字母变成大写
start=ret.startswith("A")
end=ret.endswith("c")
if start==True and end==True:
li_1.append(tu[t])
else:
pass
t+=1
for value in dic.values():
ret=value.lstrip()
if ret.startswith("A")==True and ret.endswith("c")==True:
li_1.append(ret)
elif ret.startswith("a" )==True and ret.endswith("c")==True:
li_1.append(ret)
print(li_1)
2.查找
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):
print(k,v)
inp =input("input nunbel:")
inp=int(inp)
if inp >0 and inp<=len(li):
print(li[inp-1])
else:
print("商品不存在")
商品列表
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
ass_all=input('总资产:')
ass_all= int(ass_all)
car_all =[]
goods = [
{"name": "电脑", "price": 1999},
{"name": "鼠标", "price": 10},
{"name": "游艇", "price": 20},
{"name": "美女", "price": 998},
]
for i in goods:
print(i["name"],i["price"])
while True:
i2 = input("请选择商品（Y/y结算）：")
if i2.lower() == "y":
break
for j in goods:
if j["name"] == i2 :
car_all.append(j)
print(car_all)
p_all = 0
for p in car_all:
m = p["price"]
p_all+=m
if p_all>0 and ass_all < ass_all :
print("购买成功")
elif p_all==0 :
print("你没有选择商品")
else:
print("余额不足")
购物车程序1
#/usr/bin/env python
#_*_coding:utf-8_*_
total = int(input("总额："))
all_cat={}
goods = [
{"name": "电脑", "price": 1999},
{"name": "鼠标", "price": 10},
{"name": "游艇", "price": 20},
{"name": "美女", "price": 998},
]
for i in goods:
print (i["name"],i["price"]) #打印出所有商品
while True:
i2 = input("请输入要购买的商品名称(Y/y结算)：")
if i2.lower()=="y": #检测用户结算行为
break
#循环所有商品
for i in goods:
if i["name"]==i2:
name = i["name"]
if i2 in all_cat.keys():#判断购买的商品是否在购物车
all_cat[name]={"single_price":i["price"],"num":all_cat[i2]["num"]+1} #在，数量上加1
else:
all_cat[name]={"single_price":i["price"],"num":1} #不在条件入购物车
print(all_cat)
sum= 0
for item in all_cat.values() :
single_all = item["num"]*item["single_price"]
sum+=single_all
if sum <= total:
print("购买成功")
elif sum ==0 :
print("你没有选购商品")
else:
print("余额不足")
购物车程序2
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": {
"开封": ["xx", "ooo", "sss"],
"信阳": ["ccc", "bbb", "aaa"],
},
"山西": {
"],
"],
},
}
for s in dic.keys():
print(s)
x= input("请输入省份：")
b= dic[x]
for v in b.keys() :
print(v)
ds= input("请输入地市：")
xc=dic[x][ds]
for xianc in xc:
print(xianc)
5.三级联动