列表
格式：name = []
name = [name1, name2, name3, name4, name5]
#针对列表的操作
name.index("name1")#查询指定数值的下标值 name.count("name1")#查询指定数值的总数 name.clear("name")#清空列表 name.reverse("name")#反转列表数值 name.sort("name")#排序，优先顺序 特殊字符-数字-大写字母-小写字母 name.extend("name1")#扩展。把另一个列表的值增加到当前列表
#增加 add
name.append("name5")#追加 name.insert(1, "name1.5")#插入指定位置
#删除 delete
name.remove("name1")#根据人名删除 del name[0]#根据下标删除列表里的值 del name #删除列表 name.pop(0)#删除指定下标的值，默认是最后一个
#查询 select
print(name[0], name[2])#根据下标读取 print(name[0:2]) == print(name[:2])#切片 （连续的一段：顾头不顾尾，0和-1都可以省略） print(name[-1])#-1 获取最后一个位置的值 print(name[-2:])#获取最后两个值，从前往后数最后一个是-1、依次是-3、-2、-1
#更改 update
name[1] = "name1.5"#更改指定下标的值
#列表copy分为深copy和浅copy
深copy 会把列表里的子列表 copy过去
name = ["name1", "name2", "name3", "name4", ["name5", "name6"]] name1 = copy.deepcopy(name) name[4][1] = "name7" name[1] = "name2.1" print(name) print(name1)
result(结果)
['name1', 'name2.1', 'name3', 'name4', ['name5', 'name7']] ['name1', 'name2', 'name3', 'name4', ['name5', 'name6']]
浅copy 只会copy列表的第一层，如果新文件子列表里的数值更改，老文件子列表的值不会更改
name = ["name1", "name2", "name3", "name4", ["name5", "name6"]] name1 = name.copy() = copy.copy(name) = name[:] = list(name) name[4][1] = "name7" name[1] = "name2.1" print(name) print(name1)
result(结果)
['name1', 'name2.1', 'name3', 'name4', ['name5', 'name7']] ['name1', 'name2', 'name3', 'name4', ['name5', 'name7']
元组（不可变的列表）
格式：tuple = ("tu1", "tu2")
和列表一样，不可增删改。只能查询（切片）
tuple = ("tup1", "tup2") print(tuple.count("tup1")) print(tuple.index("tup2"))
练习题：
程序：购物车程序
需求:
- 启动程序后，让用户输入工资，然后打印商品列表
- 允许用户根据商品编号购买商品
- 用户选择商品后，检测余额是否够，够就直接扣款，不够就提醒
- 可随时退出，退出时，打印已购买商品和余额
#购物车练习题 shoplist = [[1, "iphone", 6000], [2, "mac pro", 12000], [3, "ipad air", 8000], [4, "chicken", 30], [5, "eggs", 5], [6, "bike", 500]] mall = [] salary = int(input("please input your salary:")) while True: for i in range(0, len(shoplist)): print(shoplist[i]) goodid = int(input("Please enter the number you want to buy goods:")) - 1 if int(shoplist[goodid][2]) > salary: print("Don't buy goods you want") else: mall.append(shoplist[goodid]) salary = salary - shoplist[goodid][2] yesorno = input("To continue shopping？input Y or N") if yesorno == 'N': print("Do you have bought the goods:%s,remaining sum:%s" % (mall, salary)) print("Thanks for coming.") break
优化修正版本:
#优化版本
import os, pickle, time
Bool = bool(True)
'''获取已存在的用户，如不存在 赋值为空'''
if os.path.exists(r'user_mess.pkl') == Bool:
pkl_file = open('user_mess.pkl', 'rb')
reg_user = pickle.load(pkl_file)
pkl_file.close()
else:
reg_user = {}
'''获取用户的历史购物列表'''
if os.path.exists(r'usershoplist.pkl') == Bool:
dirc = open('usershoplist.pkl', 'rb')
hist_dic = pickle.load(dirc)
dirc.close()
else:
hist_dic = {}
shopping_car = {
"iphone": {1: ["iphone", 6888, 5], 2: ["ipad", 4000, 8], 3: ["Samsung", 3000, 3]},
"variety": {1: ["headset", 50, 5], 2: ["usb_cable", 18, 8], 3: ["teacup", 60, 30]},
"clothing": {1: ["coat", 900, 5], 2: ["pants", 110, 8], 3: ["shoes", 300, 3]}
}
shop_history = {}
temporary_list = []
dict1 = {}
print("欢迎来到购物商城".center(50, '*'))
count = 0
True_False = 'True'
input_value = input("登录输入1，注册输入2，退出输入q:")
if input_value.isdigit(): # 判断输入的是否是数字
if int(input_value) == 1: # 登录流程
while True_False:
register_name = input("用户名：")
register_pwd = input("密 码：")
if register_name in reg_user.keys() and register_pwd == reg_user[register_name]['pwd']:
print("登录成功".center(40, '-'))
True_False = False
else:
count += 1
if count == 3:
exit("多次输入错误，退出程序")
else:
print("******************************")
print("用户名或者密码错误！请重新输入.")
print("******************************")
elif int(input_value) == 2: # 注册流程
while True_False:
register_name = input("用户名：")
register_pwd = input("密 码：")
register_sal = input("存入金额：")
if register_name in reg_user.keys(): # 判断用户名是否存在，存在重新输入，不存在注册成功，进入商城
print("用户已存在！重新输入")
else:
if register_sal.isdigit():
reg_user[register_name] = {"pwd": register_pwd, "money": register_sal}
user_val = open('user_mess.pkl', 'wb')
pickle.dump(reg_user, user_val)
user_val.close()
print("注册成功！".center(50, '-'))
True_False = False
else:
count += 1
if count == 3:
exit("多次输入错误，退出程序")
else:
print("存钱失败！输入正确的数字")
else:
exit("输入错误！")
elif input_value == "q":
if temporary_list:
for i in temporary_list:
print(i)
else:
print("本次没有购买任何商品哦！")
exit("谢谢您的光顾，欢迎再来")
else:
exit("Please enter the Numbers")
'''打印用户历史购物列表'''
if register_name in hist_dic.keys(): print("上次的购物列表") for i in hist_dic[register_name]: print(i)'''更新用户信息'''def update_usermessage(Salary): reg_user[register_name]["money"] = Salary user_val = open('user_mess.pkl', 'wb') pickle.dump(reg_user, user_val) user_val.close()'''更新用户已购列表'''def update_shophist(hist_list): if temporary_list: shop_history[register_name] = temporary_list file_obj = open('usershoplist.pkl', 'wb') pickle.dump(shop_history, file_obj) file_obj.close()'''充值'''def Recharge(Salary, Money): if Money.isdigit(): Salary += Money # 更新用户金额 print("充值成功，现在余额为 33[31;1m [s] 33[0m" % Salary) update_usermessage(Salary) else: print("充值失败")'''打印已购商品'''def print_list(): if temporary_list: print("已购买的商品".center(50, '=')) print("商品名 数量 金额 购买时间") for i in temporary_list: print(i) print("".center(50, '=')) else: print("本次没有购买任何商品哦！")Salary = int(reg_user[register_name]["money"])print("购物车欢迎你 %s ,你的账户余额为%s" % (register_name, Salary))print("============================================")while not True_False: for i in enumerate(shopping_car): # 打印商品列表 print(i[0] + 1, '.', i[1]) dict1[i[0]] = i[1] print("============================================") print("(1)退出输入 33[31;1m q 33[0m") print("(2)充值输入 33[31;1m r 33[0m") print("(3)查看详细商品输入类型编号") select_type = input("请输入:") if select_type == "q": # 退出并更新 用户信息 update_usermessage(Salary) print_list() exit("欢迎下次光临") if select_type == "r": top_up = input("输入充值金额：") if top_up.isdigit(): Salary += int(top_up) # 更新用户金额 print("充值成功，现在余额为 33[31;1m [%s] 33[0m" % Salary) update_usermessage(Salary) else: print("充值失败") continue if select_type.isdigit(): if int(select_type) in (1, 2, 3): BIAN = int(select_type) - 1 for j in shopping_car[dict1[BIAN]]: print(j, ':', shopping_car[dict1[BIAN]][j]) print("********************************") print("(1)输入 33[31;1m b 33[0m 返回上一层") print("(2)输入 33[31;1m s 33[0m 查询已购列表") print("(3)输入 33[31;1m q 33[0m 退出") print("(4)输入商品对应的序号，自动购买商品！") print('-------------------------------') Num = input("请输入:") if Num == "b": continue if Num == "q": # 如果选择退出，则判断购物车是否为空，不为空就写入到文件 print_list() update_usermessage(Salary) exit("谢谢您的光顾，欢迎再来") if Num == "s": # 选择查询，列表不为空就打印，空就提示 if temporary_list: print("已购买的商品%s,余额为%s" % (temporary_list, Salary)) else: print("购入车空空如也！赶紧去购物吧！") elif Num.isdigit() and int(Num) <= len(shopping_car[dict1[BIAN]]) and int(Num) != 0: # 购物 shop_time = time.strftime("%Y-%m-%d %H:%M:%S", time.localtime(time.time())) Get_num = shopping_car[dict1[BIAN]].get(int(Num))[2] # 获取剩余件数 Select_Digit = input("本商品一共 %s 件,你想要购买几件:" % Get_num) # 选择输入几件 if Select_Digit.isdigit() and Get_num >= int(Select_Digit): price = shopping_car[dict1[BIAN]].get(int(Num))[1] price_sum = price * int(Select_Digit) if price_sum <= int(Salary): # 判断剩余金额是否足够 Salary = int(Salary) - price_sum # 更新余额 shopping_car[dict1[BIAN]][int(Num)][2] = int(Get_num) - int(Select_Digit) temporary_list.append((shopping_car[dict1[BIAN]].get(int(Num))[0], Select_Digit, price_sum, shop_time)) # 购物信息插入列表，供查询 print("购买成功") update_shophist(temporary_list) sel_con = input("继续购物输 33[31;1m c 33[0m，退出输 33[31;1m q 33[0m，" "充值按 33[31;1m r 33[0m，""查看已购列表输 33[31;1m s 33[0m:") if sel_con == "c": pass if sel_con == "q": update_usermessage(Salary) print_list() print("谢谢您的光顾，欢迎再来") True_False = True if sel_con == "r": top_up = input("输入充值金额：") if top_up.isdigit(): Salary += int(top_up) # 更新用户金额 print("充值成功，现在余额为 33[31;1m [%s] 33[0m" % Salary) update_usermessage(Salary) else: print("充值失败") if sel_con == 's': print_list() else: print('-------------------------------------') print("你的余额为 33[31m;%s 33[0m，余额不足，请充值后再购买！也可以选择价格便宜的购买" % Salary) print('-------------------------------------') if_top_up = input("是否充值？充值输入1，不充值按任意键") if if_top_up == "1": top_up = input("输入充值金额：") if top_up.isdigit(): Salary += int(top_up) # 更新用户金额 print("充值成功，现在余额为 33[31;1m [%s] 33[0m" % Salary) update_usermessage(Salary) else: print("充值失败") else: print("请输入正确的件数，并且最大不能超过库存的商品件数！") else: print("请输入正确的商品序号！") else: print("无此编号") else: print("输入错误")
字典：(无序、无下标，根据key来查找对应的value)
格式:
info = {"key": "value",}
dictionary = {"n1": "5000",
"n2": "5200",
"n3": "2300",
"n4": "9000"}
#查询
print(dictionary["n2"])#在知道key是什么的时候查询，如果key不存在就报错
print(dictionary.get("n5"))#如果key不存在会返回none，存在就返回value。
print("n2" in dictionary)#判断key是否存在，返回true or false py2.7中格式是 dictionary.has_key("n3")
#增加
dictionary["n2"] = "5100"
dictionary["n6"] = "800"
print(dictionary)
#删除
dictionary.pop("n7")
del dictionary["n3"]#删除已知key对应的值，不存在会报错
print(dictionary)
#修改
dictionary["n2"] = "5100"
dictionary["n6"] = "800"
#其他
#values
print(dictionary.values())#查询所有value，不输出key
#keys
print(dictionary.keys())#只输出key
#setdefault
dictionary.setdefault("n5", "100")#key若有就打印value，没有就赋新value
#update(相对于两个字典来说使用，有相同的key就替换value，无则插入)
dictionary = {"n1": "5000",
"n2": "5200",
"n3": "2300",
"n4": "9000"}
dictionary1={
"n1": "8",
"n3": "10000",
"n6": "100",
"n7": "4000"
}
dictionary.update(dictionary1)
print(dictionary)
{'n2': '5200', 'n4': '9000', 'n3': '10000', 'n7': '4000', 'n1': '8', 'n6': '100'}
#items将字典转换成列表
print(dictionary.items())
dict_items([('n2', '5200'), ('n3', '2300'), ('n4', '9000'), ('n1', '5000')])
#字典循环
方法一：
for i in dictionary: print(i, dictionary[i])
方法二： 会把字典dictionary转换成列表list，不建议使用
for key, value in dictionary.items(): print(key, value)
#字典练习，三级菜单
# 三级菜单 menus = {"北京": { "东城区": {"景点": {"upward", "man"}, "大学": {"北大", "清华"}, "房山区": {"D中", "D南"}}, "朝阳区": {"故宫": {}, "天安": {}, "东门": {}}, "房山区": {}}, "山东": {"烟台": {}, "青岛": {}, "济南": {}}, "广州": {"东莞": {}, "广东": {}, "佛山": {}}} # print(menus["北京"]["朝阳"]) exit_falg = True while exit_falg: for i in menus: print(i) regino = input("请输入你要去什么地方！1") if regino in menus: while exit_falg: for i1 in menus[regino]: print('>>>>' + i1) regino1 = input("请输入你要去什么地方！2") if regino1 in menus[regino]: while exit_falg: for i2 in menus[regino][regino1]: print('>>>>>>>' + i2) regino2 = input("请输入你要去什么地方！3") if regino2 in menus[regino][regino1]: for i3 in menus[regino][regino1][regino2]: print('>>>>>>>>>>' + i3) goback = input("最后一层，按b返回上一层！") if goback == "b": pass else: exit_falg = False elif regino2 == "b": break else: exit_falg = False elif regino1 == "b": break else: exit_falg = False else: exit_falg = False
集合 set集合 无序，不重复序列
li = [11, 22, 33, 11, 22, 33]
# 类后面加个（） 就会执行类内部的一个_init_ 方法
# list(), str(), dict(), set()
# 创建集合
se = {11, 22, 33}
print(type(se))
s = set() # 创建一个空的集合
s3 = set(li) # 转换出一个集合
print(s3) # {33, 11, 22}
# 操作集合
s = set() s.add(123) print(s) s.clear() print(s) s1 = {11, 22, 33} s2 = {22, 33, 44} s3 = s1.difference(s2) # A中存在，B中不存在 print(s3) # 11 s4 = s1.symmetric_difference(s2) # A中存在，B中不存在的值和 B中存在，A中不存在的值 print(s4) # {11, 44} s1.difference_update(s2) # A中存在，B中不存在的值更新到新的集合中 print(s1) # {11} s2.symmetric_difference_update(s1) # 差集更新到s2 s3 = s1.intersection(s2) # 交集 s1.intersection_update(s2) # 交集更新到s1 s5 = s1.union(s2) # 并集 print(s5) print(s2) # {11, 44} s1.discard(2222) # 移除指定元素，不存在不报错 s1.remove(222) # 移除指定元素， 不存在报错 new = s1.pop() # 无参数，随机移除,并返回移除的值 lis = [1, 3, 4, 6, 6] s1.update(lis) # 迭代更新，相当于多次添加 print(s1)
# 练习题
old_dict = { "1": 8, "2": 4, "4": 2 } new_dict = { "1": 4, "2": 4, "3": 2 } old_set = set(old_dict.keys()) new_set = set(new_dict.keys()) remove_set = old_set.difference(new_dict) # 应该删除的 add_set = new_set.difference(old_set) # 应该增加的 update_set = new_set.intersection(old_set) # 应该更新的 print(remove_set,add_set,update_set) for i in remove_set: old_dict.pop(i) # del old_dict[i] print(old_dict['2']) print(new_set) for i in add_set: old_dict[i] = new_dict[i] for i in update_set: old_dict[i] = new_dict[i] print(old_dict)