{
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  {
   "cell_type": "code",
   "execution_count": 7,
   "metadata": {
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   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "5.0 6\n"
     ]
    }
   ],
   "source": [
    "# Numbers in Python\n",
    "\n",
    "x = 5    # integer (discrete)\n",
    "y = 5.813  # floating point number / real number (continuous-ish)\n",
    "\n",
    "x = float(x)\n",
    "y = round(y) # round to nearest integer\n",
    "\n",
    "print(x, y)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {
    "collapsed": true
   },
   "outputs": [],
   "source": [
    "# Other discrete variables\n",
    "\n",
    "x = 'string'\n",
    "x = True"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 13,
   "metadata": {
    "collapsed": false
   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "[1, 3, 5, 7, 7, 7, 9] 7\n",
      "{9, 3, 5, 1, 7} 5\n"
     ]
    }
   ],
   "source": [
    "# Collections (Lists and sets)\n",
    "\n",
    "odds1 = [1, 3, 5, 7, 7, 7, 9]   # list/array/vector\n",
    "odds2 = {1, 3, 5, 7, 7, 7, 9}   # set\n",
    "\n",
    "#odds1 = set(odds1)\n",
    "#odds2 = list(odds2)\n",
    "\n",
    "print(odds1, len(odds1))\n",
    "print(odds2, len(odds2))"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 20,
   "metadata": {
    "collapsed": false,
    "scrolled": true
   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "1 3\n",
      "9\n",
      "[1, 3, 5]\n"
     ]
    }
   ],
   "source": [
    "# Accessing elements of lists\n",
    "\n",
    "odds = [1, 3, 5, 7, 9]\n",
    "\n",
    "first = odds[0]   # first element starts at 0\n",
    "second = odds[1]   # first element starts at 1\n",
    "print(first, second)\n",
    "\n",
    "last = odds[-1]\n",
    "print(last)\n",
    "\n",
    "# Slicing\n",
    "\n",
    "section = odds[0:3]\n",
    "print(section)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {
    "collapsed": true
   },
   "outputs": [],
   "source": []
  }
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