Sorting via multiple attributes in Python (key = function).ipynb

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   "source": [
    "#SORTING!\n",
    "\n",
    "temp_list = [12,6, 9]"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 2,
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     "data": {
      "text/plain": [
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      ]
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   "source": [
    "#normal sorting\n",
    "sorted(temp_list)\n",
    "\n"
   ]
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   "cell_type": "code",
   "execution_count": 3,
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   "outputs": [
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     "data": {
      "text/plain": [
       "[12, 6, 9]"
      ]
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     "output_type": "execute_result"
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   "source": [
    "temp_list"
   ]
  },
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   "cell_type": "code",
   "execution_count": 4,
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   "outputs": [
    {
     "data": {
      "text/plain": [
       "[12, 9, 6]"
      ]
     },
     "execution_count": 4,
     "metadata": {},
     "output_type": "execute_result"
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   ],
   "source": [
    "#reverse option\n",
    "\n",
    "sorted(temp_list, reverse= True)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 5,
   "metadata": {
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   "outputs": [],
   "source": [
    "# Unordered tuple_list\n",
    "tuple_list = [('a', '2'), ('c', '1'), ('d', '3'), ('a', '3')]"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 6,
   "metadata": {
    "collapsed": true
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   "outputs": [],
   "source": [
    "func = lambda x: x[1]"
   ]
  },
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   "cell_type": "code",
   "execution_count": 7,
   "metadata": {
    "collapsed": false
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   "outputs": [
    {
     "data": {
      "text/plain": [
       "[('c', '1'), ('a', '2'), ('d', '3'), ('a', '3')]"
      ]
     },
     "execution_count": 7,
     "metadata": {},
     "output_type": "execute_result"
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   ],
   "source": [
    "sorted(tuple_list,key = func)"
   ]
  },
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   "cell_type": "code",
   "execution_count": 8,
   "metadata": {
    "collapsed": false
   },
   "outputs": [
    {
     "data": {
      "text/plain": [
       "[('A', '2'), ('D', '3'), ('a', '1'), ('b', '3')]"
      ]
     },
     "execution_count": 8,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "#Another example\n",
    "\n",
    "tuple_list = [('A', '2'), ('a', '1'), ('D', '3'), ('b', '3')]\n",
    "sorted(tuple_list)\n",
    "\n"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 9,
   "metadata": {
    "collapsed": true
   },
   "outputs": [],
   "source": [
    "func = lambda x: str.casefold(x[0])"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 10,
   "metadata": {
    "collapsed": false
   },
   "outputs": [
    {
     "data": {
      "text/plain": [
       "[('A', '2'), ('a', '1'), ('b', '3'), ('D', '3')]"
      ]
     },
     "execution_count": 10,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "sorted(tuple_list,key = func)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {
    "collapsed": true
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   "outputs": [],
   "source": []
  },
  {
   "cell_type": "code",
   "execution_count": 14,
   "metadata": {
    "collapsed": true
   },
   "outputs": [],
   "source": [
    "#multiple parameters\n",
    "tuple_list = [('a', '4'), ('c', '1'), ('d', '3'), ('a', '3')]"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 16,
   "metadata": {
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   "outputs": [
    {
     "data": {
      "text/plain": [
       "[('a', '4'), ('a', '3'), ('c', '1'), ('d', '3')]"
      ]
     },
     "execution_count": 16,
     "metadata": {},
     "output_type": "execute_result"
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   ],
   "source": [
    "sorted(tuple_list, key = lambda x: x[0])"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 17,
   "metadata": {
    "collapsed": false
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   "outputs": [
    {
     "data": {
      "text/plain": [
       "[('a', '4'), ('c', '1'), ('d', '3'), ('a', '3')]"
      ]
     },
     "execution_count": 17,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "tuple_list"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 18,
   "metadata": {
    "collapsed": true
   },
   "outputs": [],
   "source": [
    "func = lambda x: (x[0], x[1])"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 19,
   "metadata": {
    "collapsed": false
   },
   "outputs": [
    {
     "data": {
      "text/plain": [
       "[('a', '3'), ('a', '4'), ('c', '1'), ('d', '3')]"
      ]
     },
     "execution_count": 19,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "sorted(tuple_list, key = func)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {
    "collapsed": true
   },
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   "source": []
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