2-magic-method_2.ipynb

{
 "cells": [
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "# 函数调用"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 2,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "The result is 4\n"
     ]
    }
   ],
   "source": [
    "class Operation(object):\n",
    "    def __init__(self, x, y):\n",
    "        self.x = x\n",
    "        self.y = y\n",
    "        \n",
    "    def add(self):\n",
    "        print(\"The result is {}\".format(self.x + self.y))\n",
    "      \n",
    "opt = Operation(2, 2)\n",
    "opt.add()"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 3,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "The result is 6\n"
     ]
    }
   ],
   "source": [
    "class Operation(object):\n",
    "    def __init__(self):\n",
    "        self.x = None\n",
    "        self.y = None\n",
    "        \n",
    "    def add(self):\n",
    "        print(\"The result is {}\".format(self.x + self.y))\n",
    "      \n",
    "    def __call__(self, x, y):\n",
    "        self.x = x\n",
    "        self.y = y\n",
    "        self.add()\n",
    "        \n",
    "opt = Operation()\n",
    "opt(3, 3)"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "# 序列和容器"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 19,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "222222\n",
      "666666\n"
     ]
    },
    {
     "data": {
      "text/plain": [
       "4"
      ]
     },
     "execution_count": 19,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "class Contain(object):\n",
    "    def __init__(self, data):\n",
    "        self.data = data\n",
    "        \n",
    "    def __contains__(self, x):\n",
    "        return x in self.data\n",
    "    \n",
    "    def __len__(self):\n",
    "        return len(self.data)\n",
    "    \n",
    "contain = Contain([2,3,4,5])\n",
    "\n",
    "if 2 in contain:\n",
    "    print(\"222222\")\n",
    "    \n",
    "if 6 not in contain:\n",
    "    print(\"666666\")\n",
    "    \n",
    "len(contain)"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "# 算数运算"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 42,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "the value if 8\n",
      "the value if 15\n"
     ]
    }
   ],
   "source": [
    "class Operation(object):\n",
    "    def __init__(self, value):\n",
    "        self.value = value\n",
    "        \n",
    "    def __add__(self, other):\n",
    "        return Operation(self.value + other.value)\n",
    "    \n",
    "    def __mul__(self, other):\n",
    "        return Operation(self.value * other.value)\n",
    "    \n",
    "    def __str__(self):\n",
    "        return \"the value if {}\".format(self.value)\n",
    "    \n",
    "a = Operation(3)\n",
    "b = Operation(5)\n",
    "print(a + b)\n",
    "print(a * b)"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "# 比较运算"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 45,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "True"
      ]
     },
     "execution_count": 45,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "class Cmp(object):\n",
    "    def __init__(self, value):\n",
    "        self.value = value\n",
    "        \n",
    "    def __eq__(self, other):\n",
    "        return self.value == other.value\n",
    "    \n",
    "    def __gt__(self, other):\n",
    "        return self.value > other.value\n",
    "a = Cmp(3)\n",
    "b = Cmp(3)\n",
    "a == b"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "# 字段功能"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 61,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "3"
      ]
     },
     "execution_count": 61,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "class Dictionaries(object):\n",
    "    def __setitem__(self, key, value):\n",
    "        self.__dict__[key] = value\n",
    "        \n",
    "    def __getitem__(self, key):\n",
    "        return self.__dict__[key]\n",
    "    \n",
    "    def __delitem__(self, key):\n",
    "        del self.__dict__[key]\n",
    "\n",
    "diction = Dictionaries()\n",
    "diction[\"one\"] = 1\n",
    "diction[\"two\"] = 2\n",
    "diction[\"three\"] = 3\n",
    "diction['three']\n",
    "del diction['three']\n",
    "diction['three']"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 56,
   "metadata": {},
   "outputs": [],
   "source": []
  },
  {
   "cell_type": "code",
   "execution_count": 57,
   "metadata": {},
   "outputs": [
    {
     "ename": "KeyError",
     "evalue": "'three'",
     "output_type": "error",
     "traceback": [
      "\u001b[1;31m---------------------------------------------------------------------------\u001b[0m",
      "\u001b[1;31mKeyError\u001b[0m                                  Traceback (most recent call last)",
      "\u001b[1;32m<ipython-input-57-dfe1a566046b>\u001b[0m in \u001b[0;36m<module>\u001b[1;34m()\u001b[0m\n\u001b[1;32m----> 1\u001b[1;33m \u001b[0mdiction\u001b[0m\u001b[1;33m[\u001b[0m\u001b[1;34m'three'\u001b[0m\u001b[1;33m]\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0m",
      "\u001b[1;32m<ipython-input-55-21dcfd1e91cb>\u001b[0m in \u001b[0;36m__getitem__\u001b[1;34m(self, key)\u001b[0m\n\u001b[0;32m      4\u001b[0m \u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0;32m      5\u001b[0m     \u001b[1;32mdef\u001b[0m \u001b[0m__getitem__\u001b[0m\u001b[1;33m(\u001b[0m\u001b[0mself\u001b[0m\u001b[1;33m,\u001b[0m \u001b[0mkey\u001b[0m\u001b[1;33m)\u001b[0m\u001b[1;33m:\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[1;32m----> 6\u001b[1;33m         \u001b[1;32mreturn\u001b[0m \u001b[0mself\u001b[0m\u001b[1;33m.\u001b[0m\u001b[0m__dict__\u001b[0m\u001b[1;33m[\u001b[0m\u001b[0mkey\u001b[0m\u001b[1;33m]\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0m\u001b[0;32m      7\u001b[0m \u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0;32m      8\u001b[0m     \u001b[1;32mdef\u001b[0m \u001b[0m__delitem__\u001b[0m\u001b[1;33m(\u001b[0m\u001b[0mself\u001b[0m\u001b[1;33m,\u001b[0m \u001b[0mkey\u001b[0m\u001b[1;33m)\u001b[0m\u001b[1;33m:\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n",
      "\u001b[1;31mKeyError\u001b[0m: 'three'"
     ]
    }
   ],
   "source": []
  },
  {
   "cell_type": "code",
   "execution_count": 54,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "3"
      ]
     },
     "execution_count": 54,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": []
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": []
  }
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