{
 "metadata": {
  "name": "",
  "signature": "sha256:ded94f2baeac630507627dd813671f8a496b507b8c87b3afd934c9a290e337b0"
 },
 "nbformat": 3,
 "nbformat_minor": 0,
 "worksheets": [
  {
   "cells": [
    {
     "cell_type": "markdown",
     "metadata": {},
     "source": [
      "# String Operations\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:**\n",
      "\n",
      "### Python 3 has three string types\n",
      "- str() is for unicode\n",
      "- bytes() is for binary data\n",
      "- bytesarray() mutable variable of bytes"
     ]
    },
    {
     "cell_type": "markdown",
     "metadata": {},
     "source": [
      "### Create some simulated text."
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "string = 'The quick brown fox jumped over the lazy brown bear.'"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [],
     "prompt_number": 1
    },
    {
     "cell_type": "markdown",
     "metadata": {},
     "source": [
      "### Capitalize the first letter."
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "string_capitalized = string.capitalize()\n",
      "string_capitalized"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "metadata": {},
       "output_type": "pyout",
       "prompt_number": 2,
       "text": [
        "'The quick brown fox jumped over the lazy brown bear.'"
       ]
      }
     ],
     "prompt_number": 2
    },
    {
     "cell_type": "markdown",
     "metadata": {},
     "source": [
      "### Center the string with periods on either side, for a total of 79 characters"
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "string_centered = string.center(79, '.')\n",
      "string_centered"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "metadata": {},
       "output_type": "pyout",
       "prompt_number": 3,
       "text": [
        "'..............The quick brown fox jumped over the lazy brown bear..............'"
       ]
      }
     ],
     "prompt_number": 3
    },
    {
     "cell_type": "markdown",
     "metadata": {},
     "source": [
      "### Count the number of e's between the fifth and last character"
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "string_counted = string.count('e', 4, len(string))\n",
      "string_counted"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "metadata": {},
       "output_type": "pyout",
       "prompt_number": 4,
       "text": [
        "4"
       ]
      }
     ],
     "prompt_number": 4
    },
    {
     "cell_type": "markdown",
     "metadata": {},
     "source": [
      "### Locate any e's between the fifth and last character"
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "string_find = string.find('e', 4, len(string))\n",
      "string_find"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "metadata": {},
       "output_type": "pyout",
       "prompt_number": 5,
       "text": [
        "24"
       ]
      }
     ],
     "prompt_number": 5
    },
    {
     "cell_type": "markdown",
     "metadata": {},
     "source": [
      "### Are all characters are alphabet?"
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "string_isalpha = string.isalpha()\n",
      "string_isalpha"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "metadata": {},
       "output_type": "pyout",
       "prompt_number": 6,
       "text": [
        "False"
       ]
      }
     ],
     "prompt_number": 6
    },
    {
     "cell_type": "markdown",
     "metadata": {},
     "source": [
      "### Are all characters digits?"
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "string_isdigit = string.isdigit()\n",
      "string_isdigit"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "metadata": {},
       "output_type": "pyout",
       "prompt_number": 7,
       "text": [
        "False"
       ]
      }
     ],
     "prompt_number": 7
    },
    {
     "cell_type": "markdown",
     "metadata": {},
     "source": [
      "### Are all characters lower case?"
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "string_islower = string.islower()\n",
      "string_islower"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "metadata": {},
       "output_type": "pyout",
       "prompt_number": 8,
       "text": [
        "False"
       ]
      }
     ],
     "prompt_number": 8
    },
    {
     "cell_type": "markdown",
     "metadata": {},
     "source": [
      "### Are all chracters alphanumeric?"
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "string_isalnum = string.isalnum()\n",
      "string_isalnum"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "metadata": {},
       "output_type": "pyout",
       "prompt_number": 11,
       "text": [
        "False"
       ]
      }
     ],
     "prompt_number": 11
    },
    {
     "cell_type": "markdown",
     "metadata": {},
     "source": [
      "### Are all characters whitespaces?"
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "string_isalnum = string.isspace()\n",
      "string_isalnum"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "metadata": {},
       "output_type": "pyout",
       "prompt_number": 12,
       "text": [
        "False"
       ]
      }
     ],
     "prompt_number": 12
    },
    {
     "cell_type": "markdown",
     "metadata": {},
     "source": [
      "### Is the string properly titlespaced?"
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "string_istitle = string.istitle()\n",
      "string_istitle"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "metadata": {},
       "output_type": "pyout",
       "prompt_number": 13,
       "text": [
        "False"
       ]
      }
     ],
     "prompt_number": 13
    },
    {
     "cell_type": "markdown",
     "metadata": {},
     "source": [
      "### Are all the characters uppercase?"
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "string_isupper = string.isupper()\n",
      "string_isupper"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "metadata": {},
       "output_type": "pyout",
       "prompt_number": 14,
       "text": [
        "False"
       ]
      }
     ],
     "prompt_number": 14
    },
    {
     "cell_type": "markdown",
     "metadata": {},
     "source": [
      "### Return the lengths of string"
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "len(string)"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "metadata": {},
       "output_type": "pyout",
       "prompt_number": 15,
       "text": [
        "52"
       ]
      }
     ],
     "prompt_number": 15
    },
    {
     "cell_type": "markdown",
     "metadata": {},
     "source": [
      "### Convert string to lower case"
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "string_lower = string.lower()\n",
      "string_lower"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "metadata": {},
       "output_type": "pyout",
       "prompt_number": 16,
       "text": [
        "'the quick brown fox jumped over the lazy brown bear.'"
       ]
      }
     ],
     "prompt_number": 16
    },
    {
     "cell_type": "markdown",
     "metadata": {},
     "source": [
      "### Convert string to lower case"
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "string_upper = string.upper()\n",
      "string_upper"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "metadata": {},
       "output_type": "pyout",
       "prompt_number": 17,
       "text": [
        "'THE QUICK BROWN FOX JUMPED OVER THE LAZY BROWN BEAR.'"
       ]
      }
     ],
     "prompt_number": 17
    },
    {
     "cell_type": "markdown",
     "metadata": {},
     "source": [
      "### Convert string to title case"
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "string_title = string.title()\n",
      "string_title"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "metadata": {},
       "output_type": "pyout",
       "prompt_number": 18,
       "text": [
        "'The Quick Brown Fox Jumped Over The Lazy Brown Bear.'"
       ]
      }
     ],
     "prompt_number": 18
    },
    {
     "cell_type": "markdown",
     "metadata": {},
     "source": [
      "### Convert string the inverted case"
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "string_swapcase = string.swapcase()\n",
      "string_swapcase"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "metadata": {},
       "output_type": "pyout",
       "prompt_number": 19,
       "text": [
        "'tHE QUICK BROWN FOX JUMPED OVER THE LAZY BROWN BEAR.'"
       ]
      }
     ],
     "prompt_number": 19
    },
    {
     "cell_type": "markdown",
     "metadata": {},
     "source": [
      "### Remove all leading whitespaces (i.e. to the left)"
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "string_lstrip = string.lstrip()\n",
      "string_lstrip"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "metadata": {},
       "output_type": "pyout",
       "prompt_number": 20,
       "text": [
        "'The quick brown fox jumped over the lazy brown bear.'"
       ]
      }
     ],
     "prompt_number": 20
    },
    {
     "cell_type": "markdown",
     "metadata": {},
     "source": [
      "### Remove all leading and trailing whitespaces (i.e. to the left and right)"
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "string_strip = string.strip()\n",
      "string_strip"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "metadata": {},
       "output_type": "pyout",
       "prompt_number": 21,
       "text": [
        "'The quick brown fox jumped over the lazy brown bear.'"
       ]
      }
     ],
     "prompt_number": 21
    },
    {
     "cell_type": "markdown",
     "metadata": {},
     "source": [
      "### Remove all trailing whitespaces (i.e. to the right)"
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "string_rstrip = string.rstrip()\n",
      "string_rstrip"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "metadata": {},
       "output_type": "pyout",
       "prompt_number": 22,
       "text": [
        "'The quick brown fox jumped over the lazy brown bear.'"
       ]
      }
     ],
     "prompt_number": 22
    },
    {
     "cell_type": "markdown",
     "metadata": {},
     "source": [
      "### Replace lower case e's with upper case E's, to a maximum of 4"
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "string_replace = string.replace('e', 'E', 4)\n",
      "string_replace"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "metadata": {},
       "output_type": "pyout",
       "prompt_number": 23,
       "text": [
        "'ThE quick brown fox jumpEd ovEr thE lazy brown bear.'"
       ]
      }
     ],
     "prompt_number": 23
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [],
     "language": "python",
     "metadata": {},
     "outputs": []
    }
   ],
   "metadata": {}
  }
 ]
}