week11_元组_集合_字典.ipynb · liulinan/python-feinan

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week11_元组_集合_字典.ipynb 17.25 KB

{
 "cells": [
  {
   "cell_type": "markdown",
   "source": [
    "-------------\n",
    "* 课程：python\n",
    "* 记录人：刘黎南\n",
    "* 时间：2022.11.2\n",
    "-------------------"
   ],
   "metadata": {
    "collapsed": false,
    "pycharm": {
     "name": "#%% md\n"
    }
   }
  },
  {
   "cell_type": "markdown",
   "source": [
    "# 本周内容\n",
    ">1.元组\n",
    ">2.集合\n",
    ">3.字典"
   ],
   "metadata": {
    "collapsed": false,
    "pycharm": {
     "name": "#%% md\n"
    }
   }
  },
  {
   "cell_type": "markdown",
   "source": [
    "## 1.元组(tuple)\n",
    ">1.元组的概念和基本形态\n",
    "\n",
    ">2.元组的方法"
   ],
   "metadata": {
    "collapsed": false,
    "pycharm": {
     "name": "#%% md\n"
    }
   }
  },
  {
   "cell_type": "code",
   "execution_count": 1,
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "(180001, 180002, 180003) <class 'tuple'>\n"
     ]
    }
   ],
   "source": [
    "user_info = 180001,180002,180003\n",
    "print(user_info,type(user_info))"
   ],
   "metadata": {
    "collapsed": false,
    "pycharm": {
     "name": "#%%\n"
    }
   }
  },
  {
   "cell_type": "code",
   "execution_count": 2,
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "[180001, 180002, 180003] <class 'list'>\n"
     ]
    }
   ],
   "source": [
    "user_info_list = [180001,180002,180003]\n",
    "print(user_info_list,type(user_info_list))"
   ],
   "metadata": {
    "collapsed": false,
    "pycharm": {
     "name": "#%%\n"
    }
   }
  },
  {
   "cell_type": "code",
   "execution_count": 3,
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "180001\n",
      "(180001, 180002)\n"
     ]
    }
   ],
   "source": [
    "# 取值\n",
    "print(user_info[0])\n",
    "# 切片\n",
    "print(user_info[:2])"
   ],
   "metadata": {
    "collapsed": false,
    "pycharm": {
     "name": "#%%\n"
    }
   }
  },
  {
   "cell_type": "code",
   "execution_count": 10,
   "outputs": [],
   "source": [
    "import time"
   ],
   "metadata": {
    "collapsed": false,
    "pycharm": {
     "name": "#%%\n"
    }
   }
  },
  {
   "cell_type": "code",
   "execution_count": 11,
   "outputs": [
    {
     "data": {
      "text/plain": "time.struct_time(tm_year=2022, tm_mon=11, tm_mday=2, tm_hour=19, tm_min=14, tm_sec=2, tm_wday=2, tm_yday=306, tm_isdst=0)"
     },
     "execution_count": 11,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "time.localtime()"
   ],
   "metadata": {
    "collapsed": false,
    "pycharm": {
     "name": "#%%\n"
    }
   }
  },
  {
   "cell_type": "code",
   "execution_count": 12,
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Help on struct_time object:\n",
      "\n",
      "class struct_time(builtins.tuple)\n",
      " |  struct_time(iterable=(), /)\n",
      " |  \n",
      " |  The time value as returned by gmtime(), localtime(), and strptime(), and\n",
      " |  accepted by asctime(), mktime() and strftime().  May be considered as a\n",
      " |  sequence of 9 integers.\n",
      " |  \n",
      " |  Note that several fields' values are not the same as those defined by\n",
      " |  the C language standard for struct tm.  For example, the value of the\n",
      " |  field tm_year is the actual year, not year - 1900.  See individual\n",
      " |  fields' descriptions for details.\n",
      " |  \n",
      " |  Method resolution order:\n",
      " |      struct_time\n",
      " |      builtins.tuple\n",
      " |      builtins.object\n",
      " |  \n",
      " |  Methods defined here:\n",
      " |  \n",
      " |  __reduce__(...)\n",
      " |      Helper for pickle.\n",
      " |  \n",
      " |  __repr__(self, /)\n",
      " |      Return repr(self).\n",
      " |  \n",
      " |  ----------------------------------------------------------------------\n",
      " |  Static methods defined here:\n",
      " |  \n",
      " |  __new__(*args, **kwargs) from builtins.type\n",
      " |      Create and return a new object.  See help(type) for accurate signature.\n",
      " |  \n",
      " |  ----------------------------------------------------------------------\n",
      " |  Data descriptors defined here:\n",
      " |  \n",
      " |  tm_gmtoff\n",
      " |      offset from UTC in seconds\n",
      " |  \n",
      " |  tm_hour\n",
      " |      hours, range [0, 23]\n",
      " |  \n",
      " |  tm_isdst\n",
      " |      1 if summer time is in effect, 0 if not, and -1 if unknown\n",
      " |  \n",
      " |  tm_mday\n",
      " |      day of month, range [1, 31]\n",
      " |  \n",
      " |  tm_min\n",
      " |      minutes, range [0, 59]\n",
      " |  \n",
      " |  tm_mon\n",
      " |      month of year, range [1, 12]\n",
      " |  \n",
      " |  tm_sec\n",
      " |      seconds, range [0, 61])\n",
      " |  \n",
      " |  tm_wday\n",
      " |      day of week, range [0, 6], Monday is 0\n",
      " |  \n",
      " |  tm_yday\n",
      " |      day of year, range [1, 366]\n",
      " |  \n",
      " |  tm_year\n",
      " |      year, for example, 1993\n",
      " |  \n",
      " |  tm_zone\n",
      " |      abbreviation of timezone name\n",
      " |  \n",
      " |  ----------------------------------------------------------------------\n",
      " |  Data and other attributes defined here:\n",
      " |  \n",
      " |  n_fields = 11\n",
      " |  \n",
      " |  n_sequence_fields = 9\n",
      " |  \n",
      " |  n_unnamed_fields = 0\n",
      " |  \n",
      " |  ----------------------------------------------------------------------\n",
      " |  Methods inherited from builtins.tuple:\n",
      " |  \n",
      " |  __add__(self, value, /)\n",
      " |      Return self+value.\n",
      " |  \n",
      " |  __contains__(self, key, /)\n",
      " |      Return key in self.\n",
      " |  \n",
      " |  __eq__(self, value, /)\n",
      " |      Return self==value.\n",
      " |  \n",
      " |  __ge__(self, value, /)\n",
      " |      Return self>=value.\n",
      " |  \n",
      " |  __getattribute__(self, name, /)\n",
      " |      Return getattr(self, name).\n",
      " |  \n",
      " |  __getitem__(self, key, /)\n",
      " |      Return self[key].\n",
      " |  \n",
      " |  __getnewargs__(self, /)\n",
      " |  \n",
      " |  __gt__(self, value, /)\n",
      " |      Return self>value.\n",
      " |  \n",
      " |  __hash__(self, /)\n",
      " |      Return hash(self).\n",
      " |  \n",
      " |  __iter__(self, /)\n",
      " |      Implement iter(self).\n",
      " |  \n",
      " |  __le__(self, value, /)\n",
      " |      Return self<=value.\n",
      " |  \n",
      " |  __len__(self, /)\n",
      " |      Return len(self).\n",
      " |  \n",
      " |  __lt__(self, value, /)\n",
      " |      Return self<value.\n",
      " |  \n",
      " |  __mul__(self, value, /)\n",
      " |      Return self*value.\n",
      " |  \n",
      " |  __ne__(self, value, /)\n",
      " |      Return self!=value.\n",
      " |  \n",
      " |  __rmul__(self, value, /)\n",
      " |      Return value*self.\n",
      " |  \n",
      " |  count(self, value, /)\n",
      " |      Return number of occurrences of value.\n",
      " |  \n",
      " |  index(self, value, start=0, stop=9223372036854775807, /)\n",
      " |      Return first index of value.\n",
      " |      \n",
      " |      Raises ValueError if the value is not present.\n",
      " |  \n",
      " |  ----------------------------------------------------------------------\n",
      " |  Class methods inherited from builtins.tuple:\n",
      " |  \n",
      " |  __class_getitem__(...) from builtins.type\n",
      " |      See PEP 585\n",
      "\n"
     ]
    }
   ],
   "source": [
    "help(time.localtime())"
   ],
   "metadata": {
    "collapsed": false,
    "pycharm": {
     "name": "#%%\n"
    }
   }
  },
  {
   "cell_type": "code",
   "execution_count": 13,
   "outputs": [
    {
     "data": {
      "text/plain": "1667387804.9782345"
     },
     "execution_count": 13,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "time.time()  # 时间戳，可以记录互联网当中所有数据信息产生、销毁、创建一系列行为"
   ],
   "metadata": {
    "collapsed": false,
    "pycharm": {
     "name": "#%%\n"
    }
   }
  },
  {
   "cell_type": "code",
   "execution_count": 14,
   "outputs": [
    {
     "data": {
      "text/plain": "1"
     },
     "execution_count": 14,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "user_info.count(180001)"
   ],
   "metadata": {
    "collapsed": false,
    "pycharm": {
     "name": "#%%\n"
    }
   }
  },
  {
   "cell_type": "code",
   "execution_count": 15,
   "outputs": [
    {
     "data": {
      "text/plain": "0"
     },
     "execution_count": 15,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "user_info.index(180001) # 元组只能用.count和.index"
   ],
   "metadata": {
    "collapsed": false,
    "pycharm": {
     "name": "#%%\n"
    }
   }
  },
  {
   "cell_type": "markdown",
   "source": [
    "## 2.集合\n",
    ">1.集合的概念和性质\n",
    ">>1.集合的唯一性\n",
    ">>2.集合的无序性\n",
    ">\n",
    ">2.集合的方法\n",
    ">>1.交集：逻辑运算符：  setA&setB  ， setA.intersection(B) ==》应用：推荐系统\n",
    ">>2.并集：逻辑运算符：  setA|setB  ， setA.unlon(B) ==》应用：快速统计两个集合元素的个数"
   ],
   "metadata": {
    "collapsed": false,
    "pycharm": {
     "name": "#%% md\n"
    }
   }
  },
  {
   "cell_type": "code",
   "execution_count": 16,
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "{'apple', 'banana', 'pear', 'orange'} <class 'set'>\n"
     ]
    }
   ],
   "source": [
    "basket = {'apple', 'orange', 'apple', 'pear', 'orange', 'banana'}\n",
    "print(basket,type(basket))"
   ],
   "metadata": {
    "collapsed": false,
    "pycharm": {
     "name": "#%%\n"
    }
   }
  },
  {
   "cell_type": "code",
   "execution_count": 17,
   "outputs": [
    {
     "data": {
      "text/plain": "{180001, 180044}"
     },
     "execution_count": 17,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "# 方法1\n",
    "舞蹈社_user_id = {180001,180002,180033,180044}\n",
    "合唱团_user_id = {180003,180044,180001}\n",
    "舞蹈社_user_id&合唱团_user_id"
   ],
   "metadata": {
    "collapsed": false,
    "pycharm": {
     "name": "#%%\n"
    }
   }
  },
  {
   "cell_type": "code",
   "execution_count": 18,
   "outputs": [
    {
     "data": {
      "text/plain": "{180001, 180044}"
     },
     "execution_count": 18,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "# 方法2\n",
    "舞蹈社_user_id.intersection(合唱团_user_id)"
   ],
   "metadata": {
    "collapsed": false,
    "pycharm": {
     "name": "#%%\n"
    }
   }
  },
  {
   "cell_type": "code",
   "execution_count": 19,
   "outputs": [
    {
     "data": {
      "text/plain": "7"
     },
     "execution_count": 19,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "len(舞蹈社_user_id) + len(合唱团_user_id)"
   ],
   "metadata": {
    "collapsed": false,
    "pycharm": {
     "name": "#%%\n"
    }
   }
  },
  {
   "cell_type": "code",
   "execution_count": 20,
   "outputs": [
    {
     "data": {
      "text/plain": "5"
     },
     "execution_count": 20,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "len(舞蹈社_user_id | 合唱团_user_id)"
   ],
   "metadata": {
    "collapsed": false,
    "pycharm": {
     "name": "#%%\n"
    }
   }
  },
  {
   "cell_type": "code",
   "execution_count": 21,
   "outputs": [],
   "source": [
    "## 思考：如果是列表的话，想要找出重复的项？ 集合的价值\n",
    "舞蹈社_user_id_list = [180001,180002,180033,180044]\n",
    "合唱团_user_id_list = [180003,180044,180001]"
   ],
   "metadata": {
    "collapsed": false,
    "pycharm": {
     "name": "#%%\n"
    }
   }
  },
  {
   "cell_type": "markdown",
   "source": [
    "## 3.字典（dict）\n",
    ">1.字典的概念和性质\n",
    ">>1.性质\n",
    ">>>1.无序性\n",
    ">>>2.key是唯一的（没有重复的）\n",
    ">>>3.key是不可变的\n",
    ">\n",
    ">2.字典的创建\n",
    "\n",
    ">>1.按照字典的形态创建字典\n",
    " '''\n",
    " 网新1班 = {\n",
    "   18001:\"李华\",\n",
    "   18002:\"张三\",\n",
    "   18003:\"李四\",\n",
    "   18004:\"王五\",\n",
    " }\n",
    " '''\n",
    "\n",
    " >>2.使用dict（）方法创建字典\n",
    " '''\n",
    " 网新2班 = dict(\n",
    "     stu18001=\"tom\",\n",
    "     stu18002=\"jan\",\n",
    "     stu18003=\"marry\",\n",
    "     stu18004=\"lisa\",\n",
    " )\n",
    " '''\n",
    "\n",
    " >>3.字典的方法\n"
   ],
   "metadata": {
    "collapsed": false,
    "pycharm": {
     "name": "#%% md\n"
    }
   }
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "outputs": [],
   "source": [
    "###字典查询效率非常高，比列表高很多，相当于现实中查字典，根据偏旁部首或拼音可以直接翻到那一页，而列表还要一个个/一页页去查，也就是根据index=1索引值去查"
   ],
   "metadata": {
    "collapsed": false,
    "pycharm": {
     "name": "#%%\n"
    }
   }
  },
  {
   "cell_type": "code",
   "execution_count": 24,
   "outputs": [],
   "source": [
    "wechat = {\n",
    "    \"liulinan003\":[\"linan\",\"广州\",\"状态\",\"个性签名\",\"置顶收藏\"],\n",
    "        \"sys1104\":[\"莎莎\",\"河北\",\"in黄石比赛ing\"]\n",
    "}"
   ],
   "metadata": {
    "collapsed": false,
    "pycharm": {
     "name": "#%%\n"
    }
   }
  },
  {
   "cell_type": "code",
   "execution_count": 25,
   "outputs": [
    {
     "data": {
      "text/plain": "['莎莎', '河北', 'in黄石比赛ing']"
     },
     "execution_count": 25,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "wechat[\"sys1104\"]"
   ],
   "metadata": {
    "collapsed": false,
    "pycharm": {
     "name": "#%%\n"
    }
   }
  },
  {
   "cell_type": "code",
   "execution_count": 27,
   "outputs": [],
   "source": [
    "网新1班 = {\n",
    "   18001:\"李华\",\n",
    "   18002:\"张三\",\n",
    "   18003:\"李四\",\n",
    "   18004:\"王五\",\n",
    " }"
   ],
   "metadata": {
    "collapsed": false,
    "pycharm": {
     "name": "#%%\n"
    }
   }
  },
  {
   "cell_type": "code",
   "execution_count": 28,
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "{18001: '李华', 18002: '张三', 18003: '李四', 18004: '王五'} <class 'dict'>\n"
     ]
    }
   ],
   "source": [
    "print(网新1班,type(网新1班))"
   ],
   "metadata": {
    "collapsed": false,
    "pycharm": {
     "name": "#%%\n"
    }
   }
  },
  {
   "cell_type": "code",
   "execution_count": 29,
   "outputs": [
    {
     "data": {
      "text/plain": "'王五'"
     },
     "execution_count": 29,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "网新1班[18004]"
   ],
   "metadata": {
    "collapsed": false,
    "pycharm": {
     "name": "#%%\n"
    }
   }
  },
  {
   "cell_type": "code",
   "execution_count": 30,
   "outputs": [],
   "source": [
    "网新2班 = dict(\n",
    "     stu18001=\"tom\",\n",
    "     stu18002=\"jan\",\n",
    "     stu18003=\"marry\",\n",
    "     stu18004=\"lisa\",\n",
    " )"
   ],
   "metadata": {
    "collapsed": false,
    "pycharm": {
     "name": "#%%\n"
    }
   }
  },
  {
   "cell_type": "code",
   "execution_count": 31,
   "outputs": [
    {
     "data": {
      "text/plain": "{'stu18001': 'tom', 'stu18002': 'jan', 'stu18003': 'marry', 'stu18004': 'lisa'}"
     },
     "execution_count": 31,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "网新2班"
   ],
   "metadata": {
    "collapsed": false,
    "pycharm": {
     "name": "#%%\n"
    }
   }
  },
  {
   "cell_type": "markdown",
   "source": [
    "* 类似测试题\n",
    "* 取出一个列表的第十个数据"
   ],
   "metadata": {
    "collapsed": false,
    "pycharm": {
     "name": "#%% md\n"
    }
   }
  },
  {
   "cell_type": "code",
   "execution_count": 35,
   "outputs": [
    {
     "data": {
      "text/plain": "'marry'"
     },
     "execution_count": 35,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "网新2班[\"stu18003\"]"
   ],
   "metadata": {
    "collapsed": false,
    "pycharm": {
     "name": "#%%\n"
    }
   }
  },
  {
   "cell_type": "markdown",
   "source": [
    "# 课后预习字典的方法"
   ],
   "metadata": {
    "collapsed": false,
    "pycharm": {
     "name": "#%% md\n"
    }
   }
  }
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提交于 2022-11-03 00:00 . week11学习内容

Python

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liulinan / python-feinan