{
 "metadata": {
  "name": "oop_example"
 },
 "nbformat": 3,
 "nbformat_minor": 0,
 "worksheets": [
  {
   "cells": [
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "import random\n",
      "\n",
      "class Species():\n",
      "    def __init__(self, n0, r):\n",
      "        self.n = n0\n",
      "        self.r = r\n",
      "        \n",
      "    def reproduce(self):\n",
      "        self.n = self.n + self.r * self.n + random.normalvariate(0, 1)\n",
      "        \n",
      "    def get_n(self):\n",
      "        return self.n"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [],
     "prompt_number": 6
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "populations = []\n",
      "for i in range(100):\n",
      "    populations.append(Species(10, 0.1))"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [],
     "prompt_number": 7
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "t = 0\n",
      "while t < 50:\n",
      "    for pop in populations:\n",
      "        pop.reproduce()\n",
      "    t +=1"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [],
     "prompt_number": 8
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "for pop in populations:\n",
      "    print pop.get_n()"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "output_type": "stream",
       "stream": "stdout",
       "text": [
        "1187.30268427\n",
        "1498.43881535\n",
        "1152.93307959\n",
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        "967.817747881\n",
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        "1161.96711826\n",
        "1086.03804422\n",
        "1138.69080702\n",
        "1009.03927318\n",
        "1323.37132138\n",
        "976.252563491\n",
        "889.472537056\n",
        "1233.02099882\n",
        "657.937153357\n",
        "931.569058627\n",
        "1253.8246873\n",
        "1149.68845709\n",
        "1444.99609776\n",
        "1293.51816643\n",
        "1195.15753201\n",
        "1385.64409905\n",
        "820.513001523\n"
       ]
      }
     ],
     "prompt_number": 9
    }
   ],
   "metadata": {}
  }
 ]
}