Filering rows with similar values within pandas DataSet

pandas filtering playground.ipynb

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   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "# Pandas play\n",
    "Toster question https://toster.ru/q/507710"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 1,
   "metadata": {
    "collapsed": true
   },
   "outputs": [],
   "source": [
    "import pandas as pd, numpy as np"
   ]
  },
  {
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   "execution_count": 4,
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    "collapsed": true
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   "outputs": [],
   "source": [
    "df = pd.DataFrame(\n",
    "    [\n",
    "        ['bar', 1, 'foo'],\n",
    "        ['foo', 999, 'bar'],\n",
    "        ['foo', 15, 'foo'],\n",
    "        ['smth', 4, 'foo'],\n",
    "        ['smth', 23, 'bar'],\n",
    "        ['foo', -19, 'foo'],\n",
    "        ['bar', 0, 'bar'],\n",
    "        ['smth', 88, 'bar'],\n",
    "        ['foo', 10500, 'foo'],\n",
    "        ['foo', 12, 'bar'],\n",
    "    ], columns=('co11', 'co12', 'co13')\n",
    ")\n"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 14,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/html": [
       "<div>\n",
       "<style>\n",
       "    .dataframe thead tr:only-child th {\n",
       "        text-align: right;\n",
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       "\n",
       "    .dataframe tbody tr th {\n",
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       "</style>\n",
       "<table border=\"1\" class=\"dataframe\">\n",
       "  <thead>\n",
       "    <tr style=\"text-align: right;\">\n",
       "      <th></th>\n",
       "      <th>co11</th>\n",
       "      <th>co12</th>\n",
       "      <th>co13</th>\n",
       "    </tr>\n",
       "  </thead>\n",
       "  <tbody>\n",
       "    <tr>\n",
       "      <th>0</th>\n",
       "      <td>bar</td>\n",
       "      <td>1</td>\n",
       "      <td>foo</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>1</th>\n",
       "      <td>foo</td>\n",
       "      <td>999</td>\n",
       "      <td>bar</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>2</th>\n",
       "      <td>foo</td>\n",
       "      <td>15</td>\n",
       "      <td>foo</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>3</th>\n",
       "      <td>smth</td>\n",
       "      <td>4</td>\n",
       "      <td>foo</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>4</th>\n",
       "      <td>smth</td>\n",
       "      <td>23</td>\n",
       "      <td>bar</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>5</th>\n",
       "      <td>foo</td>\n",
       "      <td>-19</td>\n",
       "      <td>foo</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>6</th>\n",
       "      <td>bar</td>\n",
       "      <td>0</td>\n",
       "      <td>bar</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>7</th>\n",
       "      <td>smth</td>\n",
       "      <td>88</td>\n",
       "      <td>bar</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>8</th>\n",
       "      <td>foo</td>\n",
       "      <td>10500</td>\n",
       "      <td>foo</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>9</th>\n",
       "      <td>foo</td>\n",
       "      <td>12</td>\n",
       "      <td>bar</td>\n",
       "    </tr>\n",
       "  </tbody>\n",
       "</table>\n",
       "</div>"
      ],
      "text/plain": [
       "   co11   co12 co13\n",
       "0   bar      1  foo\n",
       "1   foo    999  bar\n",
       "2   foo     15  foo\n",
       "3  smth      4  foo\n",
       "4  smth     23  bar\n",
       "5   foo    -19  foo\n",
       "6   bar      0  bar\n",
       "7  smth     88  bar\n",
       "8   foo  10500  foo\n",
       "9   foo     12  bar"
      ]
     },
     "execution_count": 14,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "df"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 22,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/html": [
       "<div>\n",
       "<style>\n",
       "    .dataframe thead tr:only-child th {\n",
       "        text-align: right;\n",
       "    }\n",
       "\n",
       "    .dataframe thead th {\n",
       "        text-align: left;\n",
       "    }\n",
       "\n",
       "    .dataframe tbody tr th {\n",
       "        vertical-align: top;\n",
       "    }\n",
       "</style>\n",
       "<table border=\"1\" class=\"dataframe\">\n",
       "  <thead>\n",
       "    <tr style=\"text-align: right;\">\n",
       "      <th></th>\n",
       "      <th>co11</th>\n",
       "      <th>co12</th>\n",
       "      <th>co13</th>\n",
       "    </tr>\n",
       "  </thead>\n",
       "  <tbody>\n",
       "    <tr>\n",
       "      <th>2</th>\n",
       "      <td>foo</td>\n",
       "      <td>15</td>\n",
       "      <td>foo</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>5</th>\n",
       "      <td>foo</td>\n",
       "      <td>-19</td>\n",
       "      <td>foo</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>6</th>\n",
       "      <td>bar</td>\n",
       "      <td>0</td>\n",
       "      <td>bar</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>8</th>\n",
       "      <td>foo</td>\n",
       "      <td>10500</td>\n",
       "      <td>foo</td>\n",
       "    </tr>\n",
       "  </tbody>\n",
       "</table>\n",
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      "text/plain": [
       "  co11   co12 co13\n",
       "2  foo     15  foo\n",
       "5  foo    -19  foo\n",
       "6  bar      0  bar\n",
       "8  foo  10500  foo"
      ]
     },
     "execution_count": 22,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "df[df[['co11','co13']].nunique(axis=1) == 1]"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {
    "collapsed": true
   },
   "outputs": [],
   "source": []
  }
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