zoukankan      html  css  js  c++  java
  • Day 15 python 之 列表、元组、字典

    基础:

      1 #! /usr/bin/env python
      2 # -*- coding: utf-8 -*-
      3 # __author__ = "DaChao"
      4 # Date: 2017/6/8
      5 
      6 '''
      7 一:可变不可变
      8     可变:列表,字典
      9     不可变:数字,字符串,元组
     10 
     11 二:存放值的个数
     12     一个值:数字,字符串
     13     多个值(容器类型):列表,元组,字典
     14 
     15 三:取值方式
     16     直接取值:数字
     17     序列类型:字符串,元组,列表
     18     映射类型:字典
     19 '''
     20 
     21 # 一、列表 [,,,,] 中括号
     22 # a = ['a','b','c','d','c','e']
     23 # b = [5,6,1,2,3]
     24 #
     25 # b.sort()               #对原列表进行排序
     26 # print(b)
     27 
     28 # a.remove('c')          #移除列表中某个值的第一个匹配项
     29 # print(a)
     30 
     31 # print(a.pop())         #移除列表中的一个元素,并且返回该值
     32 # print(a)
     33 
     34 # a.insert(1,b)          #将对象插入列表
     35 # print(a)
     36 
     37 # print(a.index('b'))    #从列表中找出某个值第一个匹配项的索引位置
     38 
     39 # a.extend(b)            #在列表末尾一次性追加另一个序列中的多个值
     40 # print(a)
     41 
     42 # print(a.count('a'))    #统计某个元素在列表中的次数
     43 
     44 # a.append("aaa")        #在列表末尾添加新的对象
     45 # print(a)
     46 
     47 # print(len(a))    #列表长度
     48 # print(max(a))    #列表中最大值返回
     49 
     50 # print(a+b)        #列表合并相加
     51 # print(a*4)        #列表复制相乘
     52 
     53 # print(a[0])
     54 # print(a[1:5])
     55 # a[1] = 'bb'     #修改列表元素
     56 # a.append('dd')  #增添列表元素 append
     57 # print(a)
     58 # del a[0]        #删除列表元素
     59 # print(a)
     60 
     61 # 二、元祖 () 小括号
     62 
     63 # a = ('a','b','c','d','c','e')
     64 # b = (5,6,1,2,3)
     65 #
     66 # c = a + b
     67 # print(c)
     68 
     69 # 三、字典 {key1:valve1,key2:valve2,key3:valve3} 大括号 key是唯一的,但是valve不是唯一的
     70 #    key键不可变、且唯一,不可用列表表示!
     71 
     72 # dict = {"dachao":"shuai","xiao":"hao","chao":"da"}
     73 #
     74 # dict["xiao"] = "haoda"
     75 # dict["xuan"] = "dada"
     76 # del dict["dachao"]
     77 # print(dict)
     78 
     79 
     80 # m = ['a','b',['alex','yuanhao'],'d']
     81 #
     82 # for index in range(len(m)):
     83 #     value = m[index]
     84 #     if type(value) is list:
     85 #         for i in range(len(value)):
     86 #             print(value[i])
     87 #     else:
     88 #         print(value)
     89 # for count in range(0,len(m)):
     90 #     print(m[count])
     91 
     92 
     93 
     94 # m = 'alex123'
     95 # *_,a,b = m
     96 # print(a,b)
     97 # a,*_,b = m
     98 # print(a,b)
     99 
    100 # x = 6   #赋值交换
    101 # y = 8
    102 # print(x,y)
    103 # x,y = y,x
    104 # print(x,y)
    105 
    106 
    107 # 一、可变与不可变的定义
    108 # id和type不变的前提下,value可变则可变,所以数值和字符串不可变!列表可变
    109 
    110 # x = 300
    111 # y = 300
    112 # x == y  #比较数值
    113 # x is y  #比较id
    114 # type(x) == type(y)  #比较类型
    基础

    作业及练习:

      1 #! /usr/bin/env python
      2 # -*- coding: utf-8 -*-
      3 # __author__ = "DaChao"
      4 # Date: 2017/6/8
      5 
      6 #选做题:用户交互,显示省市县三级联动的选择
      7 
      8 dic1 = {}
      9 dic1["东部"] = ("烟台","青岛","威海")
     10 dic1["西北部"] = ("德州","东营","淄博")
     11 dic = {}
     12 dic["山东"] = dic1
     13 dic2 = {}
     14 dic2["吴国"] = ("周瑜","大乔","小乔")
     15 dic2["蜀国"] = ("刘备","关羽","张飞")
     16 dic2["魏国"] = ("曹操","司马懿","夏侯惇")
     17 dic["三国"] = dic2
     18 print(dic)
     19 print(dic1)
     20 print(dic2)
     21 
     22 
     23 
     24 # 四、购物车
     25 # 功能要求:
     26 #
     27 # 要求用户输入总资产,例如:2000
     28 # 显示商品列表,让用户根据序号选择商品,加入购物车
     29 # 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。
     30 # 附加:可充值、某商品移除购物车
     31 
     32 # goods = [
     33 #     {"name": "电脑", "price": 1999},
     34 #     {"name": "鼠标", "price": 10},
     35 #     {"name": "游艇", "price": 20},
     36 #     {"name": "美女", "price": 998},
     37 # ]
     38 # money = int(input("Please input your all money: "))
     39 # n = 1
     40 # goods_shop = []
     41 # for i in goods:                 #实现商品加序号的显示
     42 #     print(n,i["name"],i["price"])
     43 #     n+=1
     44 #
     45 # tag = True                      #实现顾客选择商品,并新建购物车,加入选购商品
     46 # while tag:
     47 #     num = input("Please input your choose number or 'q': ")
     48 #     if num in ('1','2','3','4'):
     49 #         goods_shop.append(goods[int(num)-1])
     50 #         continue
     51 #     elif num == 'q':
     52 #         tag = False
     53 #
     54 # sum_money = 0
     55 # for i in goods_shop:            #实现购物车金额汇总
     56 #     sum_money += int(i['price'])
     57 #
     58 # tag2 = True                     #实现购物支付
     59 # while tag2:
     60 #     print("Your total shopping money are : ",sum_money)
     61 #     buyyn = input("y or n: ")
     62 #     if buyyn == 'y':
     63 #         if sum_money <= money:
     64 #             print("Payment successful!")
     65 #         else:
     66 #             print("Sorry,your balance has been insufficient,please promptly value!")
     67 #         tag2 = False
     68 #     elif buyyn == "n":
     69 #         print("Exit!")
     70 #         tag2 = False
     71 
     72 # 三、输出商品列表,用户输入序号,显示用户选中的商品
     73 #     商品 li = ["手机", "电脑", '鼠标垫', '游艇']
     74 
     75 # li = ["手机", "电脑", '鼠标垫', '游艇']
     76 # for i,v in enumerate(li):
     77 #     print(i,v)
     78 # a = int(input("Please input your choose number: "))
     79 # print(li[a])
     80 
     81 #二、查找
     82 '''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。'''
     83 
     84 # li = ["alec", " aric", "Alex", "Tony", "rain","AAAAAc"]
     85 # for i in range(len(li)):
     86 #     a = li[i].strip()
     87 #     if a.startswith('a') or a.startswith('A'):
     88 #         if a.endswith('c'):
     89 #             print(a)
     90 
     91 # tu = ("alec", " aric", "Alex", "Tony", "rain","Ac")
     92 # for i in range(len(tu)):
     93 #     a = tu[i].strip()
     94 #     if a.startswith('a') or a.startswith('A'):
     95 #         if a.endswith('c'):
     96 #             print(a)
     97 
     98 # dic = {'k1': "alex", 'k2': ' aric',  "k3": "Alex", "k4": "Tony"}
     99 # for i in dic:            # 字典可以直接做循环范围
    100 #     a = dic[i].strip()
    101 #     if a.startswith('a') or a.startswith('A'):
    102 #         if a.endswith('c'):
    103 #             print(a)
    104 
    105 # print(dic.values())
    106 
    107 
    108 
    109 
    110 
    111 
    112 #一、元素分类
    113 
    114 # 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。
    115 # 即: {'k1': 大于66的所有值, 'k2': 小于66的所有值}
    116 
    117 
    118 # a = [11,22,33,44,55,66,77,88,99,90,100,99]    #
    119 # b = []
    120 # c = []
    121 # d = ('key1','key2')
    122 #
    123 # for i in range(0,len(a)):
    124 #     if a[i] > 66:
    125 #         b.append(a[i])
    126 #     elif a[i] < 66:
    127 #         c.append(a[i])
    128 #     else:
    129 #         continue
    130 #
    131 # e = dict.fromkeys(d)    #字典的创建
    132 # e['key1'] = b
    133 # e['key2'] = c
    134 # print(e)
    作业及练习
  • 相关阅读:
    iSCSI又称为IPSAN
    文档类型定义DTD
    HDU 2971 Tower
    HDU 1588 Gauss Fibonacci
    URAL 1005 Stone Pile
    URAL 1003 Parity
    URAL 1002 Phone Numbers
    URAL 1007 Code Words
    HDU 3306 Another kind of Fibonacci
    FZU 1683 纪念SlingShot
  • 原文地址:https://www.cnblogs.com/LiChaoAI/p/6965260.html
Copyright © 2011-2022 走看看