{
 "cells": [
  {
   "cell_type": "code",
   "execution_count": 1,
   "metadata": {},
   "outputs": [],
   "source": [
    "test_str=\"www.baidu.com\"\n",
    "test_list=[1,\"d\",5]\n",
    "test_list1=[2,4,\"n\",\"t\",3]\n",
    "test_dict={\"name\":\"dnt\",\"wechat\":\"xxx\"}"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 2,
   "metadata": {},
   "outputs": [],
   "source": [
    "##################### 运算符扩展 #####################"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 3,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "www.baidu.comwww.baidu.com\n",
      "[1, 'd', 5, 2, 4, 'n', 't', 3]\n"
     ]
    }
   ],
   "source": [
    "# + 合并 (不支持字典)\n",
    "print(test_str+test_str)\n",
    "print(test_list+test_list1)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 4,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "www.baidu.comwww.baidu.com\n",
      "[1, 'd', 5, 1, 'd', 5]\n"
     ]
    }
   ],
   "source": [
    "# * 复制 (不支持字典)\n",
    "print(test_str*2)\n",
    "print(test_list*2)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 5,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "True\n",
      "True\n",
      "False\n",
      "True\n"
     ]
    }
   ],
   "source": [
    "# in 是否存在（字典是查key）\n",
    "print(\"d\" in test_str)          #True\n",
    "print(\"d\" in test_list)         #True\n",
    "print(\"d\" in test_dict)         #False\n",
    "print(\"name\" in test_dict)      #True"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 6,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "True\n",
      "True\n",
      "True\n",
      "False\n"
     ]
    }
   ],
   "source": [
    "# not in 是否不存在（字典是查key）\n",
    "print(\"z\" not in test_str)      #True\n",
    "print(\"z\" not in test_list)     #True\n",
    "print(\"z\" not in test_dict)     #True\n",
    "print(\"name\" not in test_dict)  #False"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 7,
   "metadata": {},
   "outputs": [],
   "source": [
    "################# 内置函数扩展：（len，max，min，del） #################"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 8,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "13\n",
      "3\n",
      "2\n"
     ]
    }
   ],
   "source": [
    "# len(item) 计算容器中元素个数\n",
    "print(len(test_str))\n",
    "print(len(test_list))\n",
    "print(len(test_dict))"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 9,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "'w'"
      ]
     },
     "execution_count": 9,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "# max(item) 返回容器中元素最大值\n",
    "max(test_str)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 10,
   "metadata": {},
   "outputs": [
    {
     "ename": "TypeError",
     "evalue": "'>' not supported between instances of 'str' and 'int'",
     "output_type": "error",
     "traceback": [
      "\u001b[0;31m---------------------------------------------------------------------------\u001b[0m",
      "\u001b[0;31mTypeError\u001b[0m                                 Traceback (most recent call last)",
      "\u001b[0;32m<ipython-input-10-7da4501a78c2>\u001b[0m in \u001b[0;36m<module>\u001b[0;34m()\u001b[0m\n\u001b[1;32m      1\u001b[0m \u001b[0;31m# 这个注意一种情况（当然了，你按照之前说的规范，list里面放同一种类型就不会出错了）\u001b[0m\u001b[0;34m\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0;32m----> 2\u001b[0;31m \u001b[0mmax\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0mtest_list\u001b[0m\u001b[0;34m)\u001b[0m \u001b[0;31m#TypeError: '>' not supported between instances of 'str' and 'int'\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0m",
      "\u001b[0;31mTypeError\u001b[0m: '>' not supported between instances of 'str' and 'int'"
     ]
    }
   ],
   "source": [
    "# 这个注意一种情况（当然了，你按照之前说的规范，list里面放同一种类型就不会出错了）\n",
    "max(test_list) #TypeError: '>' not supported between instances of 'str' and 'int'"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 11,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "9\n",
      "wechat\n"
     ]
    }
   ],
   "source": [
    "test_list=[1,3,5,7,9,2]\n",
    "print(max(test_list))\n",
    "print(max(test_dict)) #比较key"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 12,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      ".\n",
      "1\n",
      "name\n"
     ]
    }
   ],
   "source": [
    "# min(item) 返回容器中元素最小值\n",
    "print(min(test_str))\n",
    "print(min(test_list))\n",
    "print(min(test_dict))"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "# del(item)\t        删除变量\n",
    "# del() or del xxx"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "# 可以忽略 cmp(item1, item2) 比较两个值\n",
    "# Python2里面有 cmp(1,2) ==> -1 \n",
    "# cmp在比较字典数据时，先比较键，再比较值"
   ]
  }
 ],
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