Assignment+2.ipynb

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    "---\n",
    "\n",
    "_You are currently looking at **version 1.2** of this notebook. To download notebooks and datafiles, as well as get help on Jupyter notebooks in the Coursera platform, visit the [Jupyter Notebook FAQ](https://www.coursera.org/learn/python-data-analysis/resources/0dhYG) course resource._\n",
    "\n",
    "---"
   ]
  },
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   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "# Assignment 2 - Pandas Introduction\n",
    "All questions are weighted the same in this assignment.\n",
    "## Part 1\n",
    "The following code loads the olympics dataset (olympics.csv), which was derrived from the Wikipedia entry on [All Time Olympic Games Medals](https://en.wikipedia.org/wiki/All-time_Olympic_Games_medal_table), and does some basic data cleaning. \n",
    "\n",
    "The columns are organized as # of Summer games, Summer medals, # of Winter games, Winter medals, total # number of games, total # of medals. Use this dataset to answer the questions below."
   ]
  },
  {
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     "data": {
      "text/html": [
       "<div>\n",
       "<table border=\"1\" class=\"dataframe\">\n",
       "  <thead>\n",
       "    <tr style=\"text-align: right;\">\n",
       "      <th></th>\n",
       "      <th># Summer</th>\n",
       "      <th>Gold</th>\n",
       "      <th>Silver</th>\n",
       "      <th>Bronze</th>\n",
       "      <th>Total</th>\n",
       "      <th># Winter</th>\n",
       "      <th>Gold.1</th>\n",
       "      <th>Silver.1</th>\n",
       "      <th>Bronze.1</th>\n",
       "      <th>Total.1</th>\n",
       "      <th># Games</th>\n",
       "      <th>Gold.2</th>\n",
       "      <th>Silver.2</th>\n",
       "      <th>Bronze.2</th>\n",
       "      <th>Combined total</th>\n",
       "      <th>ID</th>\n",
       "    </tr>\n",
       "  </thead>\n",
       "  <tbody>\n",
       "    <tr>\n",
       "      <th>Afghanistan</th>\n",
       "      <td>13</td>\n",
       "      <td>0</td>\n",
       "      <td>0</td>\n",
       "      <td>2</td>\n",
       "      <td>2</td>\n",
       "      <td>0</td>\n",
       "      <td>0</td>\n",
       "      <td>0</td>\n",
       "      <td>0</td>\n",
       "      <td>0</td>\n",
       "      <td>13</td>\n",
       "      <td>0</td>\n",
       "      <td>0</td>\n",
       "      <td>2</td>\n",
       "      <td>2</td>\n",
       "      <td>AFG</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>Algeria</th>\n",
       "      <td>12</td>\n",
       "      <td>5</td>\n",
       "      <td>2</td>\n",
       "      <td>8</td>\n",
       "      <td>15</td>\n",
       "      <td>3</td>\n",
       "      <td>0</td>\n",
       "      <td>0</td>\n",
       "      <td>0</td>\n",
       "      <td>0</td>\n",
       "      <td>15</td>\n",
       "      <td>5</td>\n",
       "      <td>2</td>\n",
       "      <td>8</td>\n",
       "      <td>15</td>\n",
       "      <td>ALG</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>Argentina</th>\n",
       "      <td>23</td>\n",
       "      <td>18</td>\n",
       "      <td>24</td>\n",
       "      <td>28</td>\n",
       "      <td>70</td>\n",
       "      <td>18</td>\n",
       "      <td>0</td>\n",
       "      <td>0</td>\n",
       "      <td>0</td>\n",
       "      <td>0</td>\n",
       "      <td>41</td>\n",
       "      <td>18</td>\n",
       "      <td>24</td>\n",
       "      <td>28</td>\n",
       "      <td>70</td>\n",
       "      <td>ARG</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>Armenia</th>\n",
       "      <td>5</td>\n",
       "      <td>1</td>\n",
       "      <td>2</td>\n",
       "      <td>9</td>\n",
       "      <td>12</td>\n",
       "      <td>6</td>\n",
       "      <td>0</td>\n",
       "      <td>0</td>\n",
       "      <td>0</td>\n",
       "      <td>0</td>\n",
       "      <td>11</td>\n",
       "      <td>1</td>\n",
       "      <td>2</td>\n",
       "      <td>9</td>\n",
       "      <td>12</td>\n",
       "      <td>ARM</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>Australasia</th>\n",
       "      <td>2</td>\n",
       "      <td>3</td>\n",
       "      <td>4</td>\n",
       "      <td>5</td>\n",
       "      <td>12</td>\n",
       "      <td>0</td>\n",
       "      <td>0</td>\n",
       "      <td>0</td>\n",
       "      <td>0</td>\n",
       "      <td>0</td>\n",
       "      <td>2</td>\n",
       "      <td>3</td>\n",
       "      <td>4</td>\n",
       "      <td>5</td>\n",
       "      <td>12</td>\n",
       "      <td>ANZ</td>\n",
       "    </tr>\n",
       "  </tbody>\n",
       "</table>\n",
       "</div>"
      ],
      "text/plain": [
       "             # Summer  Gold  Silver  Bronze  Total  # Winter  Gold.1  \\\n",
       "Afghanistan        13     0       0       2      2         0       0   \n",
       "Algeria            12     5       2       8     15         3       0   \n",
       "Argentina          23    18      24      28     70        18       0   \n",
       "Armenia             5     1       2       9     12         6       0   \n",
       "Australasia         2     3       4       5     12         0       0   \n",
       "\n",
       "             Silver.1  Bronze.1  Total.1  # Games  Gold.2  Silver.2  Bronze.2  \\\n",
       "Afghanistan         0         0        0       13       0         0         2   \n",
       "Algeria             0         0        0       15       5         2         8   \n",
       "Argentina           0         0        0       41      18        24        28   \n",
       "Armenia             0         0        0       11       1         2         9   \n",
       "Australasia         0         0        0        2       3         4         5   \n",
       "\n",
       "             Combined total   ID  \n",
       "Afghanistan               2  AFG  \n",
       "Algeria                  15  ALG  \n",
       "Argentina                70  ARG  \n",
       "Armenia                  12  ARM  \n",
       "Australasia              12  ANZ  "
      ]
     },
     "execution_count": 2,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "import pandas as pd\n",
    "\n",
    "df = pd.read_csv('olympics.csv', index_col=0, skiprows=1)\n",
    "\n",
    "for col in df.columns:\n",
    "    if col[:2]=='01':\n",
    "        df.rename(columns={col:'Gold'+col[4:]}, inplace=True)\n",
    "    if col[:2]=='02':\n",
    "        df.rename(columns={col:'Silver'+col[4:]}, inplace=True)\n",
    "    if col[:2]=='03':\n",
    "        df.rename(columns={col:'Bronze'+col[4:]}, inplace=True)\n",
    "    if col[:1]=='№':\n",
    "        df.rename(columns={col:'#'+col[1:]}, inplace=True)\n",
    "\n",
    "names_ids = df.index.str.split('\\s\\(') # split the index by '('\n",
    "\n",
    "df.index = names_ids.str[0] # the [0] element is the country name (new index) \n",
    "df['ID'] = names_ids.str[1].str[:3] # the [1] element is the abbreviation or ID (take first 3 characters from that)\n",
    "\n",
    "df = df.drop('Totals')\n",
    "df.head()"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "### Question 0 (Example)\n",
    "\n",
    "What is the first country in df?\n",
    "\n",
    "*This function should return a Series.*"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 5,
   "metadata": {
    "collapsed": false
   },
   "outputs": [
    {
     "data": {
      "text/plain": [
       "# Summer           13\n",
       "Gold                0\n",
       "Silver              0\n",
       "Bronze              2\n",
       "Total               2\n",
       "# Winter            0\n",
       "Gold.1              0\n",
       "Silver.1            0\n",
       "Bronze.1            0\n",
       "Total.1             0\n",
       "# Games            13\n",
       "Gold.2              0\n",
       "Silver.2            0\n",
       "Bronze.2            2\n",
       "Combined total      2\n",
       "ID                AFG\n",
       "Name: Afghanistan, dtype: object"
      ]
     },
     "execution_count": 5,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "# You should write your whole answer within the function provided. The autograder will call\n",
    "# this function and compare the return value against the correct solution value\n",
    "def answer_zero():\n",
    "    # This function returns the row for Afghanistan, which is a Series object. The assignment\n",
    "    # question description will tell you the general format the autograder is expecting\n",
    "    return df.iloc[0]\n",
    "\n",
    "# You can examine what your function returns by calling it in the cell. If you have questions\n",
    "# about the assignment formats, check out the discussion forums for any FAQs\n",
    "answer_zero() "
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "### Question 1\n",
    "Which country has won the most gold medals in summer games?\n",
    "\n",
    "*This function should return a single string value.*"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 58,
   "metadata": {
    "collapsed": false,
    "nbgrader": {
     "grade": false,
     "locked": false,
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    }
   },
   "outputs": [
    {
     "data": {
      "text/plain": [
       "'United States'"
      ]
     },
     "execution_count": 58,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "def answer_one():\n",
    "    IDs=df[df['Gold']==max(df['Gold'])].index\n",
    "    return IDs[0]\n",
    "answer_one()"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "### Question 2\n",
    "Which country had the biggest difference between their summer and winter gold medal counts?\n",
    "\n",
    "*This function should return a single string value.*"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 11,
   "metadata": {
    "collapsed": false
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   "outputs": [
    {
     "data": {
      "text/plain": [
       "'United States'"
      ]
     },
     "execution_count": 11,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "def answer_two():\n",
    "    IDs=df[df['Gold']-df['Gold.1']==max(df['Gold']-df['Gold.1'])].index\n",
    "    return IDs[0]\n",
    "answer_two()"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "### Question 3\n",
    "Which country has the biggest difference between their summer gold medal counts and winter gold medal counts relative to their total gold medal count? \n",
    "\n",
    "$$\\frac{Summer~Gold - Winter~Gold}{Total~Gold}$$\n",
    "\n",
    "Only include countries that have won at least 1 gold in both summer and winter.\n",
    "\n",
    "*This function should return a single string value.*"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 26,
   "metadata": {
    "collapsed": false
   },
   "outputs": [
    {
     "name": "stderr",
     "output_type": "stream",
     "text": [
      "/opt/conda/lib/python3.5/site-packages/ipykernel/__main__.py:1: UserWarning: Boolean Series key will be reindexed to match DataFrame index.\n",
      "  if __name__ == '__main__':\n"
     ]
    },
    {
     "data": {
      "text/html": [
       "<div>\n",
       "<table border=\"1\" class=\"dataframe\">\n",
       "  <thead>\n",
       "    <tr style=\"text-align: right;\">\n",
       "      <th></th>\n",
       "      <th># Summer</th>\n",
       "      <th>Gold</th>\n",
       "      <th>Silver</th>\n",
       "      <th>Bronze</th>\n",
       "      <th>Total</th>\n",
       "      <th># Winter</th>\n",
       "      <th>Gold.1</th>\n",
       "      <th>Silver.1</th>\n",
       "      <th>Bronze.1</th>\n",
       "      <th>Total.1</th>\n",
       "      <th># Games</th>\n",
       "      <th>Gold.2</th>\n",
       "      <th>Silver.2</th>\n",
       "      <th>Bronze.2</th>\n",
       "      <th>Combined total</th>\n",
       "      <th>ID</th>\n",
       "    </tr>\n",
       "  </thead>\n",
       "  <tbody>\n",
       "    <tr>\n",
       "      <th>Australia</th>\n",
       "      <td>25</td>\n",
       "      <td>139</td>\n",
       "      <td>152</td>\n",
       "      <td>177</td>\n",
       "      <td>468</td>\n",
       "      <td>18</td>\n",
       "      <td>5</td>\n",
       "      <td>3</td>\n",
       "      <td>4</td>\n",
       "      <td>12</td>\n",
       "      <td>43</td>\n",
       "      <td>144</td>\n",
       "      <td>155</td>\n",
       "      <td>181</td>\n",
       "      <td>480</td>\n",
       "      <td>AUS</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>Austria</th>\n",
       "      <td>26</td>\n",
       "      <td>18</td>\n",
       "      <td>33</td>\n",
       "      <td>35</td>\n",
       "      <td>86</td>\n",
       "      <td>22</td>\n",
       "      <td>59</td>\n",
       "      <td>78</td>\n",
       "      <td>81</td>\n",
       "      <td>218</td>\n",
       "      <td>48</td>\n",
       "      <td>77</td>\n",
       "      <td>111</td>\n",
       "      <td>116</td>\n",
       "      <td>304</td>\n",
       "      <td>AUT</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>Belarus</th>\n",
       "      <td>5</td>\n",
       "      <td>12</td>\n",
       "      <td>24</td>\n",
       "      <td>39</td>\n",
       "      <td>75</td>\n",
       "      <td>6</td>\n",
       "      <td>6</td>\n",
       "      <td>4</td>\n",
       "      <td>5</td>\n",
       "      <td>15</td>\n",
       "      <td>11</td>\n",
       "      <td>18</td>\n",
       "      <td>28</td>\n",
       "      <td>44</td>\n",
       "      <td>90</td>\n",
       "      <td>BLR</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>Belgium</th>\n",
       "      <td>25</td>\n",
       "      <td>37</td>\n",
       "      <td>52</td>\n",
       "      <td>53</td>\n",
       "      <td>142</td>\n",
       "      <td>20</td>\n",
       "      <td>1</td>\n",
       "      <td>1</td>\n",
       "      <td>3</td>\n",
       "      <td>5</td>\n",
       "      <td>45</td>\n",
       "      <td>38</td>\n",
       "      <td>53</td>\n",
       "      <td>56</td>\n",
       "      <td>147</td>\n",
       "      <td>BEL</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>Bulgaria</th>\n",
       "      <td>19</td>\n",
       "      <td>51</td>\n",
       "      <td>85</td>\n",
       "      <td>78</td>\n",
       "      <td>214</td>\n",
       "      <td>19</td>\n",
       "      <td>1</td>\n",
       "      <td>2</td>\n",
       "      <td>3</td>\n",
       "      <td>6</td>\n",
       "      <td>38</td>\n",
       "      <td>52</td>\n",
       "      <td>87</td>\n",
       "      <td>81</td>\n",
       "      <td>220</td>\n",
       "      <td>BUL</td>\n",
       "    </tr>\n",
       "  </tbody>\n",
       "</table>\n",
       "</div>"
      ],
      "text/plain": [
       "           # Summer  Gold  Silver  Bronze  Total  # Winter  Gold.1  Silver.1  \\\n",
       "Australia        25   139     152     177    468        18       5         3   \n",
       "Austria          26    18      33      35     86        22      59        78   \n",
       "Belarus           5    12      24      39     75         6       6         4   \n",
       "Belgium          25    37      52      53    142        20       1         1   \n",
       "Bulgaria         19    51      85      78    214        19       1         2   \n",
       "\n",
       "           Bronze.1  Total.1  # Games  Gold.2  Silver.2  Bronze.2  \\\n",
       "Australia         4       12       43     144       155       181   \n",
       "Austria          81      218       48      77       111       116   \n",
       "Belarus           5       15       11      18        28        44   \n",
       "Belgium           3        5       45      38        53        56   \n",
       "Bulgaria          3        6       38      52        87        81   \n",
       "\n",
       "           Combined total   ID  \n",
       "Australia             480  AUS  \n",
       "Austria               304  AUT  \n",
       "Belarus                90  BLR  \n",
       "Belgium               147  BEL  \n",
       "Bulgaria              220  BUL  "
      ]
     },
     "execution_count": 26,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "at_least_one=df[df['Gold']>0][df['Gold.1']>0]\n",
    "at_least_one.head()"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 29,
   "metadata": {
    "collapsed": false
   },
   "outputs": [
    {
     "name": "stderr",
     "output_type": "stream",
     "text": [
      "/opt/conda/lib/python3.5/site-packages/ipykernel/__main__.py:2: UserWarning: Boolean Series key will be reindexed to match DataFrame index.\n",
      "  from ipykernel import kernelapp as app\n"
     ]
    },
    {
     "data": {
      "text/plain": [
       "'Bulgaria'"
      ]
     },
     "execution_count": 29,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "def answer_three():\n",
    "    at_least_one=df[df['Gold']>0][df['Gold.1']>0]\n",
    "    IDs=at_least_one[(at_least_one['Gold']-at_least_one['Gold.1'])/(at_least_one['Gold']+at_least_one['Gold.1'])==max((at_least_one['Gold']-at_least_one['Gold.1'])/(at_least_one['Gold']+at_least_one['Gold.1']))].index\n",
    "    return IDs[0]\n",
    "answer_three()"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "### Question 4\n",
    "Write a function that creates a Series called \"Points\" which is a weighted value where each gold medal (`Gold.2`) counts for 3 points, silver medals (`Silver.2`) for 2 points, and bronze medals (`Bronze.2`) for 1 point. The function should return only the column (a Series object) which you created.\n",
    "\n",
    "*This function should return a Series named `Points` of length 146*"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 42,
   "metadata": {
    "collapsed": false
   },
   "outputs": [
    {
     "data": {
      "text/plain": [
       "pandas.core.series.Series"
      ]
     },
     "execution_count": 42,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "Points=pd.Series(3*df['Gold.2']+2*df['Silver.2']+1*df['Bronze.2'], index=df.index)\n",
    "type(Points)\n",
    "#Points"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 44,
   "metadata": {
    "collapsed": false
   },
   "outputs": [
    {
     "data": {
      "text/plain": [
       "Afghanistan                            2\n",
       "Algeria                               27\n",
       "Argentina                            130\n",
       "Armenia                               16\n",
       "Australasia                           22\n",
       "Australia                            923\n",
       "Austria                              569\n",
       "Azerbaijan                            43\n",
       "Bahamas                               24\n",
       "Bahrain                                1\n",
       "Barbados                               1\n",
       "Belarus                              154\n",
       "Belgium                              276\n",
       "Bermuda                                1\n",
       "Bohemia                                5\n",
       "Botswana                               2\n",
       "Brazil                               184\n",
       "British West Indies                    2\n",
       "Bulgaria                             411\n",
       "Burundi                                3\n",
       "Cameroon                              12\n",
       "Canada                               846\n",
       "Chile                                 24\n",
       "China                               1120\n",
       "Colombia                              29\n",
       "Costa Rica                             7\n",
       "Ivory Coast                            2\n",
       "Croatia                               67\n",
       "Cuba                                 420\n",
       "Cyprus                                 2\n",
       "                                    ... \n",
       "Spain                                268\n",
       "Sri Lanka                              4\n",
       "Sudan                                  2\n",
       "Suriname                               4\n",
       "Sweden                              1217\n",
       "Switzerland                          630\n",
       "Syria                                  6\n",
       "Chinese Taipei                        32\n",
       "Tajikistan                             4\n",
       "Tanzania                               4\n",
       "Thailand                              44\n",
       "Togo                                   1\n",
       "Tonga                                  2\n",
       "Trinidad and Tobago                   27\n",
       "Tunisia                               19\n",
       "Turkey                               191\n",
       "Uganda                                14\n",
       "Ukraine                              220\n",
       "United Arab Emirates                   3\n",
       "United States                       5684\n",
       "Uruguay                               16\n",
       "Uzbekistan                            38\n",
       "Venezuela                             18\n",
       "Vietnam                                4\n",
       "Virgin Islands                         2\n",
       "Yugoslavia                           171\n",
       "Independent Olympic Participants       4\n",
       "Zambia                                 3\n",
       "Zimbabwe                              18\n",
       "Mixed team                            38\n",
       "dtype: int64"
      ]
     },
     "execution_count": 44,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "def answer_four():\n",
    "    Points=pd.Series(3*df['Gold.2']+2*df['Silver.2']+1*df['Bronze.2'], index=df.index)\n",
    "    return Points\n",
    "answer_four()"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Part 2\n",
    "For the next set of questions, we will be using census data from the [United States Census Bureau](http://www.census.gov/popest/data/counties/totals/2015/CO-EST2015-alldata.html). Counties are political and geographic subdivisions of states in the United States. This dataset contains population data for counties and states in the US from 2010 to 2015. [See this document](http://www.census.gov/popest/data/counties/totals/2015/files/CO-EST2015-alldata.pdf) for a description of the variable names.\n",
    "\n",
    "The census dataset (census.csv) should be loaded as census_df. Answer questions using this as appropriate.\n",
    "\n",
    "### Question 5\n",
    "Which state has the most counties in it? (hint: consider the sumlevel key carefully! You'll need this for future questions too...)\n",
    "\n",
    "*This function should return a single string value.*"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 48,
   "metadata": {
    "collapsed": false
   },
   "outputs": [
    {
     "data": {
      "text/html": [
       "<div>\n",
       "<table border=\"1\" class=\"dataframe\">\n",
       "  <thead>\n",
       "    <tr style=\"text-align: right;\">\n",
       "      <th></th>\n",
       "      <th>SUMLEV</th>\n",
       "      <th>REGION</th>\n",
       "      <th>DIVISION</th>\n",
       "      <th>STATE</th>\n",
       "      <th>COUNTY</th>\n",
       "      <th>STNAME</th>\n",
       "      <th>CTYNAME</th>\n",
       "      <th>CENSUS2010POP</th>\n",
       "      <th>ESTIMATESBASE2010</th>\n",
       "      <th>POPESTIMATE2010</th>\n",
       "      <th>...</th>\n",
       "      <th>RDOMESTICMIG2011</th>\n",
       "      <th>RDOMESTICMIG2012</th>\n",
       "      <th>RDOMESTICMIG2013</th>\n",
       "      <th>RDOMESTICMIG2014</th>\n",
       "      <th>RDOMESTICMIG2015</th>\n",
       "      <th>RNETMIG2011</th>\n",
       "      <th>RNETMIG2012</th>\n",
       "      <th>RNETMIG2013</th>\n",
       "      <th>RNETMIG2014</th>\n",
       "      <th>RNETMIG2015</th>\n",
       "    </tr>\n",
       "  </thead>\n",
       "  <tbody>\n",
       "    <tr>\n",
       "      <th>0</th>\n",
       "      <td>40</td>\n",
       "      <td>3</td>\n",
       "      <td>6</td>\n",
       "      <td>1</td>\n",
       "      <td>0</td>\n",
       "      <td>Alabama</td>\n",
       "      <td>Alabama</td>\n",
       "      <td>4779736</td>\n",
       "      <td>4780127</td>\n",
       "      <td>4785161</td>\n",
       "      <td>...</td>\n",
       "      <td>0.002295</td>\n",
       "      <td>-0.193196</td>\n",
       "      <td>0.381066</td>\n",
       "      <td>0.582002</td>\n",
       "      <td>-0.467369</td>\n",
       "      <td>1.030015</td>\n",
       "      <td>0.826644</td>\n",
       "      <td>1.383282</td>\n",
       "      <td>1.724718</td>\n",
       "      <td>0.712594</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>1</th>\n",
       "      <td>50</td>\n",
       "      <td>3</td>\n",
       "      <td>6</td>\n",
       "      <td>1</td>\n",
       "      <td>1</td>\n",
       "      <td>Alabama</td>\n",
       "      <td>Autauga County</td>\n",
       "      <td>54571</td>\n",
       "      <td>54571</td>\n",
       "      <td>54660</td>\n",
       "      <td>...</td>\n",
       "      <td>7.242091</td>\n",
       "      <td>-2.915927</td>\n",
       "      <td>-3.012349</td>\n",
       "      <td>2.265971</td>\n",
       "      <td>-2.530799</td>\n",
       "      <td>7.606016</td>\n",
       "      <td>-2.626146</td>\n",
       "      <td>-2.722002</td>\n",
       "      <td>2.592270</td>\n",
       "      <td>-2.187333</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>2</th>\n",
       "      <td>50</td>\n",
       "      <td>3</td>\n",
       "      <td>6</td>\n",
       "      <td>1</td>\n",
       "      <td>3</td>\n",
       "      <td>Alabama</td>\n",
       "      <td>Baldwin County</td>\n",
       "      <td>182265</td>\n",
       "      <td>182265</td>\n",
       "      <td>183193</td>\n",
       "      <td>...</td>\n",
       "      <td>14.832960</td>\n",
       "      <td>17.647293</td>\n",
       "      <td>21.845705</td>\n",
       "      <td>19.243287</td>\n",
       "      <td>17.197872</td>\n",
       "      <td>15.844176</td>\n",
       "      <td>18.559627</td>\n",
       "      <td>22.727626</td>\n",
       "      <td>20.317142</td>\n",
       "      <td>18.293499</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>3</th>\n",
       "      <td>50</td>\n",
       "      <td>3</td>\n",
       "      <td>6</td>\n",
       "      <td>1</td>\n",
       "      <td>5</td>\n",
       "      <td>Alabama</td>\n",
       "      <td>Barbour County</td>\n",
       "      <td>27457</td>\n",
       "      <td>27457</td>\n",
       "      <td>27341</td>\n",
       "      <td>...</td>\n",
       "      <td>-4.728132</td>\n",
       "      <td>-2.500690</td>\n",
       "      <td>-7.056824</td>\n",
       "      <td>-3.904217</td>\n",
       "      <td>-10.543299</td>\n",
       "      <td>-4.874741</td>\n",
       "      <td>-2.758113</td>\n",
       "      <td>-7.167664</td>\n",
       "      <td>-3.978583</td>\n",
       "      <td>-10.543299</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>4</th>\n",
       "      <td>50</td>\n",
       "      <td>3</td>\n",
       "      <td>6</td>\n",
       "      <td>1</td>\n",
       "      <td>7</td>\n",
       "      <td>Alabama</td>\n",
       "      <td>Bibb County</td>\n",
       "      <td>22915</td>\n",
       "      <td>22919</td>\n",
       "      <td>22861</td>\n",
       "      <td>...</td>\n",
       "      <td>-5.527043</td>\n",
       "      <td>-5.068871</td>\n",
       "      <td>-6.201001</td>\n",
       "      <td>-0.177537</td>\n",
       "      <td>0.177258</td>\n",
       "      <td>-5.088389</td>\n",
       "      <td>-4.363636</td>\n",
       "      <td>-5.403729</td>\n",
       "      <td>0.754533</td>\n",
       "      <td>1.107861</td>\n",
       "    </tr>\n",
       "  </tbody>\n",
       "</table>\n",
       "<p>5 rows × 100 columns</p>\n",
       "</div>"
      ],
      "text/plain": [
       "   SUMLEV  REGION  DIVISION  STATE  COUNTY   STNAME         CTYNAME  \\\n",
       "0      40       3         6      1       0  Alabama         Alabama   \n",
       "1      50       3         6      1       1  Alabama  Autauga County   \n",
       "2      50       3         6      1       3  Alabama  Baldwin County   \n",
       "3      50       3         6      1       5  Alabama  Barbour County   \n",
       "4      50       3         6      1       7  Alabama     Bibb County   \n",
       "\n",
       "   CENSUS2010POP  ESTIMATESBASE2010  POPESTIMATE2010     ...       \\\n",
       "0        4779736            4780127          4785161     ...        \n",
       "1          54571              54571            54660     ...        \n",
       "2         182265             182265           183193     ...        \n",
       "3          27457              27457            27341     ...        \n",
       "4          22915              22919            22861     ...        \n",
       "\n",
       "   RDOMESTICMIG2011  RDOMESTICMIG2012  RDOMESTICMIG2013  RDOMESTICMIG2014  \\\n",
       "0          0.002295         -0.193196          0.381066          0.582002   \n",
       "1          7.242091         -2.915927         -3.012349          2.265971   \n",
       "2         14.832960         17.647293         21.845705         19.243287   \n",
       "3         -4.728132         -2.500690         -7.056824         -3.904217   \n",
       "4         -5.527043         -5.068871         -6.201001         -0.177537   \n",
       "\n",
       "   RDOMESTICMIG2015  RNETMIG2011  RNETMIG2012  RNETMIG2013  RNETMIG2014  \\\n",
       "0         -0.467369     1.030015     0.826644     1.383282     1.724718   \n",
       "1         -2.530799     7.606016    -2.626146    -2.722002     2.592270   \n",
       "2         17.197872    15.844176    18.559627    22.727626    20.317142   \n",
       "3        -10.543299    -4.874741    -2.758113    -7.167664    -3.978583   \n",
       "4          0.177258    -5.088389    -4.363636    -5.403729     0.754533   \n",
       "\n",
       "   RNETMIG2015  \n",
       "0     0.712594  \n",
       "1    -2.187333  \n",
       "2    18.293499  \n",
       "3   -10.543299  \n",
       "4     1.107861  \n",
       "\n",
       "[5 rows x 100 columns]"
      ]
     },
     "execution_count": 48,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "census_df = pd.read_csv('census.csv')\n",
    "census_df.head()"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 54,
   "metadata": {
    "collapsed": false
   },
   "outputs": [
    {
     "data": {
      "text/plain": [
       "'Texas'"
      ]
     },
     "execution_count": 54,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "def answer_five():\n",
    "    counties_df=census_df[census_df['SUMLEV']==50]\n",
    "    states_count=counties_df.groupby('STNAME').count()\n",
    "    state=states_count[states_count['COUNTY']==max(states_count['COUNTY'])].index[0]\n",
    "    return state\n",
    "answer_five()"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "### Question 6\n",
    "Only looking at the three most populous counties for each state, what are the three most populous states (in order of highest population to lowest population)? Use `CENSUS2010POP`.\n",
    "\n",
    "*This function should return a list of string values.*"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 178,
   "metadata": {
    "collapsed": false
   },
   "outputs": [
    {
     "data": {
      "text/plain": [
       "[36299,\n",
       " 11668,\n",
       " 46133,\n",
       " 15885,\n",
       " 13833,\n",
       " 7083,\n",
       " 40123,\n",
       " 13249,\n",
       " 4812,\n",
       " 8569,\n",
       " 91738,\n",
       " 18106,\n",
       " 75450,\n",
       " 2484,\n",
       " 28205,\n",
       " 8667,\n",
       " 29116,\n",
       " 10247,\n",
       " 43806,\n",
       " 21294,\n",
       " 21118,\n",
       " 8533,\n",
       " 7208]"
      ]
     },
     "execution_count": 178,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "counties_df=census_df[census_df['SUMLEV']==50]\n",
    "columns_to_keep = ['STNAME','CTYNAME','CENSUS2010POP']\n",
    "counties_df=counties_df[columns_to_keep]\n",
    "state_df=pd.DataFrame()\n",
    "state_df['State']=counties_df['STNAME'].unique()\n",
    "state_df['Top3PoP']=0\n",
    "state_df.set_index('State',inplace=True)\n",
    "counties_df=counties_df.set_index(['STNAME'])\n",
    "for st in state_df.index:\n",
    "    #state_df.loc[st]\n",
    "    countiespop=[]\n",
    "    countiespop_top3=[]\n",
    "    countiespop=counties_df.loc[st]['CENSUS2010POP'].tolist()\n",
    "    #countiespop=countiespop.sort()[0]+countiespop.sort()[1]+countiespop.sort()[2]\n",
    "    \n",
    "#state_df\n",
    "countiespop"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 179,
   "metadata": {
    "collapsed": false
   },
   "outputs": [
    {
     "data": {
      "text/plain": [
       "['Wyoming', 'Vermont', 'North Dakota']"
      ]
     },
     "execution_count": 179,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "def answer_six():\n",
    "    counties_df = census_df[census_df['SUMLEV'] == 50]\n",
    "    top_counties_df = counties_df.sort_values(by=['STNAME','CENSUS2010POP'],ascending=False).groupby('STNAME').head(3)\n",
    "    ans = top_counties_df.groupby('STNAME').sum().sort_values(by='CENSUS2010POP').head(3).index.tolist()\n",
    "    return ans\n",
    "answer_six()"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "### Question 7\n",
    "Which county has had the largest absolute change in population within the period 2010-2015? (Hint: population values are stored in columns POPESTIMATE2010 through POPESTIMATE2015, you need to consider all six columns.)\n",
    "\n",
    "e.g. If County Population in the 5 year period is 100, 120, 80, 105, 100, 130, then its largest change in the period would be |130-80| = 50.\n",
    "\n",
    "*This function should return a single string value.*"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 78,
   "metadata": {
    "collapsed": false
   },
   "outputs": [
    {
     "name": "stderr",
     "output_type": "stream",
     "text": [
      "/opt/conda/lib/python3.5/site-packages/ipykernel/__main__.py:3: SettingWithCopyWarning: \n",
      "A value is trying to be set on a copy of a slice from a DataFrame.\n",
      "Try using .loc[row_indexer,col_indexer] = value instead\n",
      "\n",
      "See the caveats in the documentation: http://pandas.pydata.org/pandas-docs/stable/indexing.html#indexing-view-versus-copy\n",
      "  app.launch_new_instance()\n"
     ]
    },
    {
     "data": {
      "text/plain": [
       "'Harris County'"
      ]
     },
     "execution_count": 78,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "def answer_seven():\n",
    "    counties_df=census_df[census_df['SUMLEV']==50]\n",
    "    counties_df['popdiff']=counties_df[['POPESTIMATE2010','POPESTIMATE2011','POPESTIMATE2012','POPESTIMATE2013','POPESTIMATE2014','POPESTIMATE2015']].max(axis=1)-counties_df[['POPESTIMATE2010','POPESTIMATE2011','POPESTIMATE2012','POPESTIMATE2013','POPESTIMATE2014','POPESTIMATE2015']].min(axis=1)\n",
    "    a=max(counties_df['popdiff'])\n",
    "    county_with_biggest=counties_df['CTYNAME'][counties_df['popdiff']==a].tolist()\n",
    "    return county_with_biggest[0]\n",
    "\n",
    "answer_seven()"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "### Question 8\n",
    "In this datafile, the United States is broken up into four regions using the \"REGION\" column. \n",
    "\n",
    "Create a query that finds the counties that belong to regions 1 or 2, whose name starts with 'Washington', and whose POPESTIMATE2015 was greater than their POPESTIMATE 2014.\n",
    "\n",
    "*This function should return a 5x2 DataFrame with the columns = ['STNAME', 'CTYNAME'] and the same index ID as the census_df (sorted ascending by index).*"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 80,
   "metadata": {
    "collapsed": false
   },
   "outputs": [
    {
     "data": {
      "text/html": [
       "<div>\n",
       "<table border=\"1\" class=\"dataframe\">\n",
       "  <thead>\n",
       "    <tr style=\"text-align: right;\">\n",
       "      <th></th>\n",
       "      <th>STNAME</th>\n",
       "      <th>CTYNAME</th>\n",
       "    </tr>\n",
       "  </thead>\n",
       "  <tbody>\n",
       "    <tr>\n",
       "      <th>896</th>\n",
       "      <td>Iowa</td>\n",
       "      <td>Washington County</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>1419</th>\n",
       "      <td>Minnesota</td>\n",
       "      <td>Washington County</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>2345</th>\n",
       "      <td>Pennsylvania</td>\n",
       "      <td>Washington County</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>2355</th>\n",
       "      <td>Rhode Island</td>\n",
       "      <td>Washington County</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>3163</th>\n",
       "      <td>Wisconsin</td>\n",
       "      <td>Washington County</td>\n",
       "    </tr>\n",
       "  </tbody>\n",
       "</table>\n",
       "</div>"
      ],
      "text/plain": [
       "            STNAME            CTYNAME\n",
       "896           Iowa  Washington County\n",
       "1419     Minnesota  Washington County\n",
       "2345  Pennsylvania  Washington County\n",
       "2355  Rhode Island  Washington County\n",
       "3163     Wisconsin  Washington County"
      ]
     },
     "execution_count": 80,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "def answer_eight():\n",
    "    counties_df=census_df[census_df['SUMLEV']==50]\n",
    "    counties_required=counties_df[((counties_df['REGION']==1)|(counties_df['REGION']==2)) & (counties_df['CTYNAME'].str.startswith('Washington')) &(counties_df['POPESTIMATE2015']>counties_df['POPESTIMATE2014'])][['STNAME','CTYNAME']]\n",
    "    return counties_required\n",
    "\n",
    "answer_eight()"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {
    "collapsed": true
   },
   "outputs": [],
   "source": []
  }
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