Test auto-creation of new columns in astropy.table

test_new_col.ipynb

{
 "metadata": {
  "name": "test_new_col"
 },
 "nbformat": 3,
 "nbformat_minor": 0,
 "worksheets": [
  {
   "cells": [
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "from astropy.table import Table, Column, MaskedColumn"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [],
     "prompt_number": 1
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "ca = Column('a', [1, 2])\n",
      "cb = Column('b', [3, 4])"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [],
     "prompt_number": 2
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "t = Table([ca])"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [],
     "prompt_number": 3
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "t"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "html": [
        "<table><tr><th>a</th></tr><tr><td>1</td></tr><tr><td>2</td></tr></table>"
       ],
       "output_type": "pyout",
       "prompt_number": 4,
       "text": [
        "<Table rows=2 names=('a')>\n",
        "array([(1,), (2,)], \n",
        "      dtype=[('a', '<i8')])"
       ]
      }
     ],
     "prompt_number": 4
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "t['b'] = cb"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [],
     "prompt_number": 5
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "t"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "html": [
        "<table><tr><th>a</th><th>b</th></tr><tr><td>1</td><td>3</td></tr><tr><td>2</td><td>4</td></tr></table>"
       ],
       "output_type": "pyout",
       "prompt_number": 6,
       "text": [
        "<Table rows=2 names=('a','b')>\n",
        "array([(1, 3), (2, 4)], \n",
        "      dtype=[('a', '<i8'), ('b', '<i8')])"
       ]
      }
     ],
     "prompt_number": 6
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "t['c'] = 2\n",
      "t"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "html": [
        "<table><tr><th>a</th><th>b</th><th>c</th></tr><tr><td>1</td><td>3</td><td>2</td></tr><tr><td>2</td><td>4</td><td>2</td></tr></table>"
       ],
       "output_type": "pyout",
       "prompt_number": 7,
       "text": [
        "<Table rows=2 names=('a','b','c')>\n",
        "array([(1, 3, 2), (2, 4, 2)], \n",
        "      dtype=[('a', '<i8'), ('b', '<i8'), ('c', '<i8')])"
       ]
      }
     ],
     "prompt_number": 7
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "t['d'] = t['a']\n",
      "t"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "html": [
        "<table><tr><th>a</th><th>b</th><th>c</th><th>d</th></tr><tr><td>1</td><td>3</td><td>2</td><td>1</td></tr><tr><td>2</td><td>4</td><td>2</td><td>2</td></tr></table>"
       ],
       "output_type": "pyout",
       "prompt_number": 8,
       "text": [
        "<Table rows=2 names=('a','b','c','d')>\n",
        "array([(1, 3, 2, 1), (2, 4, 2, 2)], \n",
        "      dtype=[('a', '<i8'), ('b', '<i8'), ('c', '<i8'), ('d', '<i8')])"
       ]
      }
     ],
     "prompt_number": 8
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "try:\n",
      "    t['e'] = [4, 5, 6]\n",
      "except ValueError as err:\n",
      "    print err"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "output_type": "stream",
       "stream": "stdout",
       "text": [
        "operands could not be broadcast together with shapes (2) (3) \n"
       ]
      }
     ],
     "prompt_number": 9
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "t['e'] = t['b'] * 5\n",
      "t"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "html": [
        "<table><tr><th>a</th><th>b</th><th>c</th><th>d</th><th>e</th></tr><tr><td>1</td><td>3</td><td>2</td><td>1</td><td>15</td></tr><tr><td>2</td><td>4</td><td>2</td><td>2</td><td>20</td></tr></table>"
       ],
       "output_type": "pyout",
       "prompt_number": 10,
       "text": [
        "<Table rows=2 names=('a','b','c','d','e')>\n",
        "array([(1, 3, 2, 1, 15), (2, 4, 2, 2, 20)], \n",
        "      dtype=[('a', '<i8'), ('b', '<i8'), ('c', '<i8'), ('d', '<i8'), ('e', '<i8')])"
       ]
      }
     ],
     "prompt_number": 10
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "t = Table([ca], masked=True)\n",
      "print repr(t)"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "output_type": "stream",
       "stream": "stdout",
       "text": [
        "<Table rows=2 names=('a')>\n",
        "masked_array(data = [(1,) (2,)],\n",
        "             mask = [(False,) (False,)],\n",
        "       fill_value = (999999,),\n",
        "            dtype = [('a', '<i8')])\n",
        "\n"
       ]
      }
     ],
     "prompt_number": 11
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "t['b'] = ['hello', 'world']\n",
      "t"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "html": [
        "<table><tr><th>a</th><th>b</th></tr><tr><td>1</td><td>hello</td></tr><tr><td>2</td><td>world</td></tr></table>"
       ],
       "output_type": "pyout",
       "prompt_number": 12,
       "text": [
        "<Table rows=2 names=('a','b')>\n",
        "masked_array(data = [(1, 'hello') (2, 'world')],\n",
        "             mask = [(False, False) (False, False)],\n",
        "       fill_value = (999999, 'N/A'),\n",
        "            dtype = [('a', '<i8'), ('b', '|S5')])\n"
       ]
      }
     ],
     "prompt_number": 12
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "t['c'] = MaskedColumn('ignored', [1.2, 3.4])\n",
      "t"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "html": [
        "<table><tr><th>a</th><th>b</th><th>c</th></tr><tr><td>1</td><td>hello</td><td>1.2</td></tr><tr><td>2</td><td>world</td><td>3.4</td></tr></table>"
       ],
       "output_type": "pyout",
       "prompt_number": 13,
       "text": [
        "<Table rows=2 names=('a','b','c')>\n",
        "masked_array(data = [(1, 'hello', 1.2) (2, 'world', 3.4)],\n",
        "             mask = [(False, False, False) (False, False, False)],\n",
        "       fill_value = (999999, 'N/A', 1e+20),\n",
        "            dtype = [('a', '<i8'), ('b', '|S5'), ('c', '<f8')])\n"
       ]
      }
     ],
     "prompt_number": 13
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "print repr(t)"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "output_type": "stream",
       "stream": "stdout",
       "text": [
        "<Table rows=2 names=('a','b','c')>\n",
        "masked_array(data = [(1, 'hello', 1.2) (2, 'world', 3.4)],\n",
        "             mask = [(False, False, False) (False, False, False)],\n",
        "       fill_value = (999999, 'N/A', 1e+20),\n",
        "            dtype = [('a', '<i8'), ('b', '|S5'), ('c', '<f8')])\n",
        "\n"
       ]
      }
     ],
     "prompt_number": 14
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [],
     "language": "python",
     "metadata": {},
     "outputs": [],
     "prompt_number": 14
    }
   ],
   "metadata": {}
  }
 ]
}