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  "name": "",
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  {
   "cells": [
    {
     "cell_type": "markdown",
     "metadata": {},
     "source": [
      "# Applying Functions To List Items\n",
      "\n",
      "- **Author:** [Chris Albon](http://www.chrisalbon.com/), [@ChrisAlbon](https://twitter.com/chrisalbon)\n",
      "- **Date:** -\n",
      "- **Repo:** [Python 3 code snippets for data science](https://github.com/chrisalbon/code_py)\n",
      "- **Note:** -"
     ]
    },
    {
     "cell_type": "markdown",
     "metadata": {},
     "source": [
      "### Create a list of regiment names"
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "regimentNames = ['Night Riflemen', 'Jungle Scouts', 'The Dragoons', 'Midnight Revengence', 'Wily Warriors']"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [],
     "prompt_number": 23
    },
    {
     "cell_type": "markdown",
     "metadata": {},
     "source": [
      "## Using A For Loop"
     ]
    },
    {
     "cell_type": "markdown",
     "metadata": {},
     "source": [
      "### Create a for loop goes through the list and capitalizes each"
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "# create a variable for the for loop results\n",
      "regimentNamesCapitalized_f = []\n",
      "\n",
      "# for every item in regimentNames\n",
      "for i in regimentNames:\n",
      "    # capitalize the item and add it to regimentNamesCapitalized_f\n",
      "    regimentNamesCapitalized_f.append(i.upper())\n",
      "    \n",
      "# View the outcome\n",
      "regimentNamesCapitalized_f"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "metadata": {},
       "output_type": "pyout",
       "prompt_number": 26,
       "text": [
        "['NIGHT RIFLEMEN',\n",
        " 'JUNGLE SCOUTS',\n",
        " 'THE DRAGOONS',\n",
        " 'MIDNIGHT REVENGENCE',\n",
        " 'WILY WARRIORS']"
       ]
      }
     ],
     "prompt_number": 26
    },
    {
     "cell_type": "markdown",
     "metadata": {},
     "source": [
      "## Using Map()"
     ]
    },
    {
     "cell_type": "markdown",
     "metadata": {},
     "source": [
      "### Create a lambda function that capitalizes x"
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "capitalizer = lambda x: x.upper()"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [],
     "prompt_number": 25
    },
    {
     "cell_type": "markdown",
     "metadata": {},
     "source": [
      "### Map the capitalizer function to regimentNames, convert the map into a list, and view the variable"
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "regimentNamesCapitalized_m = list(map(capitalizer, regimentNames)); regimentNamesCapitalized_m"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "metadata": {},
       "output_type": "pyout",
       "prompt_number": 18,
       "text": [
        "['NIGHT RIFLEMEN',\n",
        " 'JUNGLE SCOUTS',\n",
        " 'THE DRAGOONS',\n",
        " 'MIDNIGHT REVENGENCE',\n",
        " 'WILY WARRIORS']"
       ]
      }
     ],
     "prompt_number": 18
    },
    {
     "cell_type": "markdown",
     "metadata": {},
     "source": [
      "## Using List Comprehension"
     ]
    },
    {
     "cell_type": "markdown",
     "metadata": {},
     "source": [
      "### Apply the expression x.upper to each item in the list called regiment names. Then view the output"
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "regimentNamesCapitalized_l = [x.upper() for x in regimentNames]; regimentNamesCapitalized_l"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "metadata": {},
       "output_type": "pyout",
       "prompt_number": 22,
       "text": [
        "['NIGHT RIFLEMEN',\n",
        " 'JUNGLE SCOUTS',\n",
        " 'THE DRAGOONS',\n",
        " 'MIDNIGHT REVENGENCE',\n",
        " 'WILY WARRIORS']"
       ]
      }
     ],
     "prompt_number": 22
    }
   ],
   "metadata": {}
  }
 ]
}