{
 "metadata": {
  "name": "",
  "signature": "sha256:58382d44df2c955998ebbf2d8117ea0b047479d698e13fa9ec4b201059d38042"
 },
 "nbformat": 3,
 "nbformat_minor": 0,
 "worksheets": [
  {
   "cells": [
    {
     "cell_type": "heading",
     "level": 1,
     "metadata": {},
     "source": [
      "\u0411\u0430\u0437\u043e\u0432\u044b\u0439 \u043f\u0440\u0438\u043c\u0435\u0440"
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "import math\n",
      "\n",
      "\n",
      "class Circle:\n",
      "    def __init__(self, x, y, r):\n",
      "        self.x = x\n",
      "        self.y = y\n",
      "        self.r = r\n",
      "\n",
      "    def area(self):\n",
      "        return math.pi * self.r ** 2\n",
      "\n",
      "\n",
      "c = Circle(0, 0, 1)\n",
      "print(c.x)\n",
      "print(c.y)\n",
      "print(c.r)\n",
      "c.r = 2\n",
      "print(c.r)\n",
      "print(c.area())"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "output_type": "stream",
       "stream": "stdout",
       "text": [
        "0\n",
        "0\n",
        "1\n",
        "2\n",
        "12.566370614359172\n"
       ]
      }
     ],
     "prompt_number": 1
    },
    {
     "cell_type": "heading",
     "level": 1,
     "metadata": {},
     "source": [
      "\u0421\u0432\u043e\u0439 \u0433\u0435\u0442\u0442\u0435\u0440 \u0438 \u0441\u0435\u0442\u0442\u0435\u0440"
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "import math\n",
      "\n",
      "\n",
      "class Circle:\n",
      "    def __init__(self, x, y, r):\n",
      "        self.x = x\n",
      "        self.y = y\n",
      "        self.set_r(r)\n",
      "\n",
      "    def area(self):\n",
      "        return math.pi * self.r ** 2\n",
      "\n",
      "    def set_r(self, r):\n",
      "        if r < 0:\n",
      "            raise ValueError(\"Radius should be nonnegative\")\n",
      "        self._r = r\n",
      "\n",
      "    def get_r(self):\n",
      "        return self._r\n",
      "\n",
      "\n",
      "c = Circle(0, 0, 1)\n",
      "print(c.x)\n",
      "print(c.y)\n",
      "c.set_r(2)\n",
      "print(c.get_r())\n",
      "c.set_r(-1)"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "output_type": "stream",
       "stream": "stdout",
       "text": [
        "0\n",
        "0\n",
        "2\n"
       ]
      },
      {
       "ename": "ValueError",
       "evalue": "Radius should be nonnegative",
       "output_type": "pyerr",
       "traceback": [
        "\u001b[0;31m---------------------------------------------------------------------------\u001b[0m\n\u001b[0;31mValueError\u001b[0m                                Traceback (most recent call last)",
        "\u001b[0;32m<ipython-input-2-009b147cbfbf>\u001b[0m in \u001b[0;36m<module>\u001b[0;34m()\u001b[0m\n\u001b[1;32m     25\u001b[0m \u001b[0mc\u001b[0m\u001b[0;34m.\u001b[0m\u001b[0mset_r\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0;36m2\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[1;32m     26\u001b[0m \u001b[0mprint\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0mc\u001b[0m\u001b[0;34m.\u001b[0m\u001b[0mget_r\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0;32m---> 27\u001b[0;31m \u001b[0mc\u001b[0m\u001b[0;34m.\u001b[0m\u001b[0mset_r\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0;34m-\u001b[0m\u001b[0;36m1\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0m",
        "\u001b[0;32m<ipython-input-2-009b147cbfbf>\u001b[0m in \u001b[0;36mset_r\u001b[0;34m(self, r)\u001b[0m\n\u001b[1;32m     13\u001b[0m     \u001b[0;32mdef\u001b[0m \u001b[0mset_r\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0mself\u001b[0m\u001b[0;34m,\u001b[0m \u001b[0mr\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m:\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[1;32m     14\u001b[0m         \u001b[0;32mif\u001b[0m \u001b[0mr\u001b[0m \u001b[0;34m<\u001b[0m \u001b[0;36m0\u001b[0m\u001b[0;34m:\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0;32m---> 15\u001b[0;31m             \u001b[0;32mraise\u001b[0m \u001b[0mValueError\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0;34m\"Radius should be nonnegative\"\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0m\u001b[1;32m     16\u001b[0m         \u001b[0mself\u001b[0m\u001b[0;34m.\u001b[0m\u001b[0m_r\u001b[0m \u001b[0;34m=\u001b[0m \u001b[0mr\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[1;32m     17\u001b[0m \u001b[0;34m\u001b[0m\u001b[0m\n",
        "\u001b[0;31mValueError\u001b[0m: Radius should be nonnegative"
       ]
      }
     ],
     "prompt_number": 2
    },
    {
     "cell_type": "heading",
     "level": 1,
     "metadata": {},
     "source": [
      "\u0418\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u043d\u0438\u0435 @property"
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "import math\n",
      "\n",
      "\n",
      "class Circle:\n",
      "    def __init__(self, x, y, r):\n",
      "        self.x = x\n",
      "        self.y = y\n",
      "        self.r = r\n",
      "\n",
      "    def area(self):\n",
      "        return math.pi * self.r ** 2\n",
      "\n",
      "    @property\n",
      "    def r(self):\n",
      "        return self._r\n",
      "\n",
      "    @r.setter\n",
      "    def r(self, r):\n",
      "        if r < 0:\n",
      "            raise ValueError(\"Radius should be nonnegative\")\n",
      "        self._r = r\n",
      "\n",
      "\n",
      "c = Circle(0, 0, 1)\n",
      "print(c.x)\n",
      "print(c.y)\n",
      "c.r = 2\n",
      "print(c.r)\n",
      "c.r = -1"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "output_type": "stream",
       "stream": "stdout",
       "text": [
        "0\n",
        "0\n",
        "2\n"
       ]
      },
      {
       "ename": "ValueError",
       "evalue": "Radius should be nonnegative",
       "output_type": "pyerr",
       "traceback": [
        "\u001b[0;31m---------------------------------------------------------------------------\u001b[0m\n\u001b[0;31mValueError\u001b[0m                                Traceback (most recent call last)",
        "\u001b[0;32m<ipython-input-3-01991a0b2c7c>\u001b[0m in \u001b[0;36m<module>\u001b[0;34m()\u001b[0m\n\u001b[1;32m     27\u001b[0m \u001b[0mc\u001b[0m\u001b[0;34m.\u001b[0m\u001b[0mr\u001b[0m \u001b[0;34m=\u001b[0m \u001b[0;36m2\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[1;32m     28\u001b[0m \u001b[0mprint\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0mc\u001b[0m\u001b[0;34m.\u001b[0m\u001b[0mr\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0;32m---> 29\u001b[0;31m \u001b[0mc\u001b[0m\u001b[0;34m.\u001b[0m\u001b[0mr\u001b[0m \u001b[0;34m=\u001b[0m \u001b[0;34m-\u001b[0m\u001b[0;36m1\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0m",
        "\u001b[0;32m<ipython-input-3-01991a0b2c7c>\u001b[0m in \u001b[0;36mr\u001b[0;34m(self, r)\u001b[0m\n\u001b[1;32m     18\u001b[0m     \u001b[0;32mdef\u001b[0m \u001b[0mr\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0mself\u001b[0m\u001b[0;34m,\u001b[0m \u001b[0mr\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m:\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[1;32m     19\u001b[0m         \u001b[0;32mif\u001b[0m \u001b[0mr\u001b[0m \u001b[0;34m<\u001b[0m \u001b[0;36m0\u001b[0m\u001b[0;34m:\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0;32m---> 20\u001b[0;31m             \u001b[0;32mraise\u001b[0m \u001b[0mValueError\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0;34m\"Radius should be nonnegative\"\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0m\u001b[1;32m     21\u001b[0m         \u001b[0mself\u001b[0m\u001b[0;34m.\u001b[0m\u001b[0m_r\u001b[0m \u001b[0;34m=\u001b[0m \u001b[0mr\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[1;32m     22\u001b[0m \u001b[0;34m\u001b[0m\u001b[0m\n",
        "\u001b[0;31mValueError\u001b[0m: Radius should be nonnegative"
       ]
      }
     ],
     "prompt_number": 3
    },
    {
     "cell_type": "heading",
     "level": 1,
     "metadata": {},
     "source": [
      "\u0421\u043f\u0435\u0446\u0438\u0430\u043b\u044c\u043d\u044b\u0435 \\_\\_\u043c\u0435\u0442\u043e\u0434\u044b\\_\\_"
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "import math\n",
      "\n",
      "\n",
      "class Circle:\n",
      "    def __init__(self, x, y, r):\n",
      "        self.x = x\n",
      "        self.y = y\n",
      "        self.r = r\n",
      "\n",
      "    def area(self):\n",
      "        return math.pi * self.r ** 2\n",
      "\n",
      "    @property\n",
      "    def r(self):\n",
      "        return self._r\n",
      "\n",
      "    @r.setter\n",
      "    def r(self, r):\n",
      "        if r < 0:\n",
      "            raise ValueError(\"Radius should be nonnegative\")\n",
      "        self._r = r\n",
      "\n",
      "    def __str__(self):\n",
      "        return 'Circle: x={}, y={}, r={}'.format(self.x, self.y, self.r)\n",
      "\n",
      "    def __repr__(self):\n",
      "        return 'Circle(x={}, y={}, r={})'.format(self.x, self.y, self.r)\n",
      "\n",
      "    def __lt__(self, other):\n",
      "        return self.r < other.r\n",
      "\n",
      "    def __add__(self, other):\n",
      "        return Circle(self.x + other.x, self.y + other.y, self.r + other.r)\n",
      "\n",
      "\n",
      "c = Circle(0, 0, 1)\n",
      "print(c)\n",
      "print(repr(c))\n",
      "c2 = Circle(x=0, y=0, r=1)\n",
      "print(c2)\n",
      "print(c < c2)\n",
      "print(c + c2)"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "output_type": "stream",
       "stream": "stdout",
       "text": [
        "Circle: x=0, y=0, r=1\n",
        "Circle(x=0, y=0, r=1)\n",
        "Circle: x=0, y=0, r=1\n",
        "False\n",
        "Circle: x=0, y=0, r=2\n"
       ]
      }
     ],
     "prompt_number": 4
    }
   ],
   "metadata": {}
  }
 ]
}