4.4_notebook_quizz_pandas (completed).ipynb

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   "source": [
    "<h3> Get to Know a Pandas Array </h3>"
   ]
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   "cell_type": "markdown",
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   "source": [
    "You will use the dataframe <code>df</code> for the following:"
   ]
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   "cell_type": "code",
   "execution_count": 1,
   "metadata": {},
   "outputs": [],
   "source": [
    "import pandas as pd\n",
    "\n",
    "df=pd.DataFrame({'a':[1,2,1],'b':[1,1,1]})"
   ]
  },
  {
   "cell_type": "markdown",
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   "source": [
    "1) find the unique values in column <code> 'a' </code>:"
   ]
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   "cell_type": "code",
   "execution_count": 7,
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   "outputs": [
    {
     "data": {
      "text/plain": [
       "array([1, 2])"
      ]
     },
     "execution_count": 7,
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   "source": [
    "# df['a']  # outputs column \"a\" as a dataframe\n",
    "df['a'].unique()   # lists the unique values of colun \"a\""
   ]
  },
  {
   "cell_type": "markdown",
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   "source": [
    "2) return a dataframe with only the rows where column <code> a </code> is less than two "
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 16,
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     "data": {
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       "<div>\n",
       "<style scoped>\n",
       "    .dataframe tbody tr th:only-of-type {\n",
       "        vertical-align: middle;\n",
       "    }\n",
       "\n",
       "    .dataframe tbody tr th {\n",
       "        vertical-align: top;\n",
       "    }\n",
       "\n",
       "    .dataframe thead th {\n",
       "        text-align: right;\n",
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       "      <th></th>\n",
       "      <th>a</th>\n",
       "      <th>b</th>\n",
       "    </tr>\n",
       "  </thead>\n",
       "  <tbody>\n",
       "    <tr>\n",
       "      <th>0</th>\n",
       "      <td>1</td>\n",
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       "    </tr>\n",
       "    <tr>\n",
       "      <th>2</th>\n",
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       "      <td>1</td>\n",
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      "text/plain": [
       "   a  b\n",
       "0  1  1\n",
       "2  1  1"
      ]
     },
     "execution_count": 16,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "#df['a'] < 2\n",
    "df1=df[df['a']<2]\n",
    "df1"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "<hr>\n",
    "<small>Copyright &copy; 2018 IBM Cognitive Class. This notebook and its source code are released under the terms of the [MIT License](https://cognitiveclass.ai/mit-license/).</small>"
   ]
  }
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