test_random.ipynb

{
 "cells": [
  {
   "cell_type": "code",
   "execution_count": 1,
   "metadata": {},
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   "source": [
    "import random"
   ]
  },
  {
   "cell_type": "code",
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   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
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     "text": [
      "[86, 37, 33, 21, 35]\n",
      "[12]\n",
      "[17, 32, 35]\n"
     ]
    }
   ],
   "source": [
    "# make a function that will get a sequence of n random numbers\n",
    "def get_n_random(n):\n",
    "    return [random.randint(1,100) for _ in range(n)]\n",
    "\n",
    "print get_n_random(5)\n",
    "print get_n_random(1)\n",
    "print get_n_random(3)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 4,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "First ten numbers are:\n",
      "[14, 85, 77, 26, 50, 45, 66, 79, 10, 3]\n",
      "Demonstrate we can restart the order of random numbers with seed\n",
      "[14, 85, 77, 26, 50, 45, 66, 79, 10, 3]\n"
     ]
    },
    {
     "ename": "AssertionError",
     "evalue": "15 sequence didn't match",
     "output_type": "error",
     "traceback": [
      "\u001b[0;31m---------------------------------------------------------------------------\u001b[0m",
      "\u001b[0;31mAssertionError\u001b[0m                            Traceback (most recent call last)",
      "\u001b[0;32m<ipython-input-4-c33acaf43656>\u001b[0m in \u001b[0;36m<module>\u001b[0;34m()\u001b[0m\n\u001b[1;32m     18\u001b[0m     \u001b[0;32massert\u001b[0m \u001b[0mget_n_random\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0;36m15\u001b[0m\u001b[0;34m)\u001b[0m \u001b[0;34m==\u001b[0m \u001b[0mtest_sequence\u001b[0m\u001b[0;34m[\u001b[0m\u001b[0;34m:\u001b[0m\u001b[0;36m15\u001b[0m\u001b[0;34m]\u001b[0m\u001b[0;34m,\u001b[0m \u001b[0;34m\"15 sequence didn't match\"\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[1;32m     19\u001b[0m \u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0;32m---> 20\u001b[0;31m \u001b[0mtest_random\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0m",
      "\u001b[0;32m<ipython-input-4-c33acaf43656>\u001b[0m in \u001b[0;36mtest_random\u001b[0;34m()\u001b[0m\n\u001b[1;32m     16\u001b[0m \u001b[0;34m\u001b[0m\u001b[0m\n\u001b[1;32m     17\u001b[0m     \u001b[0;31m# Forget to see this time\u001b[0m\u001b[0;34m\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0;32m---> 18\u001b[0;31m     \u001b[0;32massert\u001b[0m \u001b[0mget_n_random\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0;36m15\u001b[0m\u001b[0;34m)\u001b[0m \u001b[0;34m==\u001b[0m \u001b[0mtest_sequence\u001b[0m\u001b[0;34m[\u001b[0m\u001b[0;34m:\u001b[0m\u001b[0;36m15\u001b[0m\u001b[0;34m]\u001b[0m\u001b[0;34m,\u001b[0m \u001b[0;34m\"15 sequence didn't match\"\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0m\u001b[1;32m     19\u001b[0m \u001b[0;34m\u001b[0m\u001b[0m\n\u001b[1;32m     20\u001b[0m \u001b[0mtest_random\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n",
      "\u001b[0;31mAssertionError\u001b[0m: 15 sequence didn't match"
     ]
    }
   ],
   "source": [
    "# To test this, we'll make a function that gets a fixed random sequence, and ensure that future calls match it\n",
    "def test_random():\n",
    "    random.seed(1)\n",
    "    test_sequence = get_n_random(50)\n",
    "    print \"First ten numbers are:\\n%s\" % test_sequence[:10]\n",
    "    \n",
    "    print \"Demonstrate we can restart the order of random numbers with seed\"\n",
    "    random.seed(1)\n",
    "    print get_n_random(10)\n",
    "    \n",
    "    random.seed(1)\n",
    "    assert get_n_random(10) == test_sequence[:10], \"10 sequence didn't match\"\n",
    "    \n",
    "    random.seed(1)\n",
    "    assert get_n_random(4) == test_sequence[:4], \"10 sequence didn't match\"\n",
    "    \n",
    "    # Forget to see this time\n",
    "    assert get_n_random(15) == test_sequence[:15], \"15 sequence didn't match\"\n",
    "\n",
    "test_random()"
   ]
  }
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