Python Basic data type exercises

First, the element classification
# has the following values set [11,22,33,44,55,66,77,88,99,90 ...], save all values greater than 66 to the first key in the dictionary, and save the value less than 66 to the value of the second key.
# that is: {' K1 ': All values greater than 66, ' K2 ': All values less than 66}

List1 = [11,22,33,44,55,66,77,88,99,90]dic1 = {     ' k1 ': [],     ' K2 ': []}for L in  list1:    if L >:        dic1 [' K1 '].append (l)    else:        dic1[' K2 '].append (l) print (DIC1)

Second, find
1. Find the elements in the list, remove the spaces for each element, and look for all elements that begin with a or a and end with C

Li = ["alc", "Aric", "Aex", "Tny", "Rain"]list1 =[]for L in Li:    #使用strip方法确定能寻找到所有元素, Startwith,endwith Search by condition    if L.strip (). StartsWith (' A ' or ' a ') and L.strip (). EndsWith (' C '):        #print (L.strip ())        List1.append (L.strip ()) Print (List1)

2, meta-group

Tu = ("alc", "Aric", "Alx", "Tny", "Rain") #找出的元素放到一个新列表中 because the element in the tuple cannot be increased list2 =[]for L in Tu:    #使用strip方法确定能寻找到所有元素, start With,endwith Search by Condition    #if determine    if L.strip (). StartsWith (' A ' or ' a ') and L.strip (). EndsWith (' C '):        #print (L.strip ())        List2.append (L.strip ()) print (LIST2)

3. Dictionaries

DiC = {' K1 ': ' Alx ', ' K2 ': ' Aric ', ' K3 ': ' Alx ', ' K4 ': ' Tny ', ' K5 ': '  Anc '} #定义一个空字典dic1 = {}for k,v in Dic.items ():    if (V.strip (). StartsWith (' a ') or V.strip (). StartsWith (' a ')) and V.strip (). EndsWith (' C '):        print (v)        dic1[k] = Vprint (DIC1)

Third, the output commodity list, the user enters the serial number, displays the user to select the product

#  Commodity li = ["Phone", "PC", "mouse pad", ' keyboard ']for num,v in Enumerate (li,1):     print (num,v) choice = Int (input ("SELECT Product:")) Choice1 =choice-1if choice1>=0 and Choice1<=len (LI)-1:    print (Li[choice1]) Else:     print ("Product does not exist")

Four, shopping cart
# Functional Requirements:
# requires the user to enter total assets, for example: 2000
# Display the list of items, let the user select items according to the serial number, add the shopping cart
# Purchase, if the total amount of goods is greater than the total assets, prompt account balance is insufficient, otherwise, the purchase succeeds.
# Additional: can recharge, a product to remove the shopping cart
Method One:

Goods = [    {"Product": "Computer", "Price": 1999},    {"Product": "Mouse", "Price": ten},    {"Product": "iphone", "Price": 50 XX},    {"Product": "Kindle", "Price": 998},] #已经买到的商品list_buy = [] #输入总资产all_money = 0all_money = Int (input ("Please enter total assets:")) #输出所有的产品for key,i in Enumerate (goods,1):    print (i[' product '],i[' price ') #当条件成立时, loop while buying link while True:    # Select the item you want to buy    choice = input ("Select item (y/y to settle purchase):")    #是否进行结算    if choice.lower () = = "Y": Break    # Loop all the goods in comparison with the selected commodity, if present, add to List_buy for    v in Goods: if        choice = = v["Product"]:            list_buy.append (v) # Output all products intended for purchase print (list_buy) #定义商品总价初始值total_price = 0for p in list_buy:    #计算所有商品价格    total_price = total_price+p ["Price"]if Total_price>all_money:    print ("Your money is not enough, please recharge%d yuan"% (Total_price-all_money))    Chongzhi = Int ( Input ("Enter recharge Amount:"))    All_money +=chongzhielse:    print ("buy success")    print (list_buy)

Method Two:

Goods = [{"Product": "Computer", "Price": 1999}, {"Product": "Mouse", "Price": ten}, {"Product": "iphone", "Price": 5000}, {"Product": "Kindle", "price": 998},]salary = Int (Input ("Enter Salary:")) #dic_shop_cart = {"Product": {"Price": 0, "num": 0}}dic _shop_cart = {} #循环输出所有产品for p in Goods:print (p[' product '],p[' prices ') while True:choice = input ("Please select the purchased item (y/y for settlement): ") if choice.lower () = = ' Y ': Break #循环所有商品 for item in goods: #判断选择的商品是否在所有商品中 if item[" prod UCT "] = = Choice: #如果存在, assign the product to product Product = item[" Product "#如果商品在字典dic_shop_cart中, dictionary In num add 1 if product in Dic_shop_cart.keys (): dic_shop_cart[product]["num"] = Dic_shop_cart[produc t]["num"] + 1 #如果不在, added to the dictionary for the first time else:dic_shop_cart[product] = {"num": 1, "SINGLE_PR Ice ": item[" Price "]} print (Dic_shop_cart) Sum_price = 0for k,v in Dic_shop_cart.items (): # print (k,v) T_price = v[" s  Ingle_price "]*v[" num "]  Print ("The number of purchased%s is%s: Total Price is%d"% (k,v["num"],t_price)) Sum_price=sum_price+t_priceprint ("All Products:%s"%sum_price) if sum_ Price>salary:print ("Your money is not enough, hahaha ... , don't buy it. Else:print ("Buy success, rich people ah ...) ")

Output Result:

V. User interaction, showing the choice of three-level linkage between provincial and municipal counties

DIC = {"    Hebei": {"        Shijiazhuang": ["Luquan", "Gaocheng", "Yuanshi"],        "Handan": ["Yongnian", "she County", "CI"],    },    "Beijing": {"        daxing": ["Huang Cun", "Qingyuan", "Heavenly Court"],        "Haidian": ["Zhongguancun", "West Two Flags", "five crossings"],    },    "Anhui": {"        Hefei": ["Luyang", "Feixi", "Binhu"],        "anqing": ["Tongcheng", "Yi Xiu District", "Yuexi "],    }}for p in dic:    print (p) p1 = input (" Please enter Province: ") if P1 in Dic.keys (): For    s in DIC[P1]:         print (s)    S1 = input ("Please enter Downtown:")    if S1 in Dic[p1].keys (): For        Q in  dic[p1][s1]:            print (q)    else:        Print ("No entry in the city") Else:    print ("The province has not been entered")

Execution Result:

Python Basic data type exercises