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     1 % Created 2010-10-10 Sun 18:28

     2 %Tutorial slides on Python.

     2 \documentclass[presentation]{beamer}

     3 %

     3 \usepackage[latin1]{inputenc}

     4 % Author: FOSSEE 

     4 \usepackage[T1]{fontenc}

     5 % Copyright (c) 2009, FOSSEE, IIT Bombay

     5 \usepackage{fixltx2e}

     6 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

     6 \usepackage{graphicx}

     7 \usepackage{longtable}

     8 \usepackage{float}

     9 \usepackage{wrapfig}

    10 \usepackage{soul}

    11 \usepackage{textcomp}

    12 \usepackage{marvosym}

    13 \usepackage{wasysym}

    14 \usepackage{latexsym}

    15 \usepackage{amssymb}

    16 \usepackage{hyperref}

    17 \tolerance=1000

    18 \usepackage[english]{babel} \usepackage{ae,aecompl}

    19 \usepackage{mathpazo,courier,euler} \usepackage[scaled=.95]{helvet}

    20 \usepackage{listings}

    21 \lstset{language=Python, basicstyle=\ttfamily\bfseries,

    22 commentstyle=\color{red}\itshape, stringstyle=\color{darkgreen},

    23 showstringspaces=false, keywordstyle=\color{blue}\bfseries}

    24 \providecommand{\alert}[1]{\textbf{#1}}

     8 \documentclass[14pt,compress]{beamer}

    26 \title{Parsing Data}

     9 %\documentclass[draft]{beamer}

    27 \author{FOSSEE}

    10 %\documentclass[compress,handout]{beamer}

    11 %\usepackage{pgfpages} 

    12 %\pgfpagesuselayout{2 on 1}[a4paper,border shrink=5mm]

    13 

    14 % Modified from: generic-ornate-15min-45min.de.tex

    15 \mode<presentation>

    16 {

    17   \usetheme{Warsaw}

    18   \useoutertheme{infolines}

    19   \setbeamercovered{transparent}

    20 }

    21 

    22 \usepackage[english]{babel}

    23 \usepackage[latin1]{inputenc}

    24 %\usepackage{times}

    25 \usepackage[T1]{fontenc}

    26 

    27 \usepackage{ae,aecompl}

    28 \usepackage{mathpazo,courier,euler}

    29 \usepackage[scaled=.95]{helvet}

    30 

    31 \definecolor{darkgreen}{rgb}{0,0.5,0}

    32 

    33 \usepackage{listings}

    34 \lstset{language=Python,

    35     basicstyle=\ttfamily\bfseries,

    36     commentstyle=\color{red}\itshape,

    37   stringstyle=\color{darkgreen},

    38   showstringspaces=false,

    39   keywordstyle=\color{blue}\bfseries}

    40 

    41 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

    42 % Macros

    43 \setbeamercolor{emphbar}{bg=blue!20, fg=black}

    44 \newcommand{\emphbar}[1]

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    46       {#1}

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    48 }

    49 \newcounter{time}

    50 \setcounter{time}{0}

    51 \newcommand{\inctime}[1]{\addtocounter{time}{#1}{\tiny \thetime\ m}}

    52 

    53 \newcommand{\typ}[1]{\lstinline{#1}}

    54 

    55 \newcommand{\kwrd}[1]{ \texttt{\textbf{\color{blue}{#1}}}  }

    56 

    57 % Title page

    58 \title{Your Title Here}

    59 

    60 \author[FOSSEE] {FOSSEE}

    61 

    62 \institute[IIT Bombay] {Department of Aerospace Engineering\\IIT Bombay}

    65 % DOCUMENT STARTS

    30 \usetheme{Warsaw}\usecolortheme{default}\useoutertheme{infolines}\setbeamercovered{transparent}

    68 \begin{frame}

    33 \maketitle

    69   \maketitle

    70 \end{frame}

    84 \begin{frame}[fragile]

    37 

    85   \frametitle{Summary}

    38 

    86   \begin{itemize}

    39 

    87     \item 

    40 

    88   \end{itemize}

    41 

    89 \end{frame}

    92   \frametitle{Thank you!}  

    44 \frametitle{Outline}

    45 \label{sec-1}

    46 

    47 \begin{itemize}

    48 \item What is meant by parsing data?

    49 \item String operations required for parsing

    50 \item Converting between data-types.

    51 \end{itemize}

    52 \end{frame}

    53 \begin{frame}

    54 \frametitle{Question 1}

    55 \label{sec-2}

    56 

    57   Split the variable line using a space as argument. Is it same as

    58   splitting without an argument ?

    59 \end{frame}

    60 \begin{frame}

    61 \frametitle{Solution 1}

    62 \label{sec-3}

    63 

    64   We see that when we split on space, multiple whitespaces are not

    65   clubbed as one and there is an empty string everytime there are two

    66   consecutive spaces.

    67 \end{frame}

    68 \begin{frame}

    69 \frametitle{Question 2}

    70 \label{sec-4}

    71 

    72   What happens to the white space inside the sentence when it is

    73   stripped? 

    74 \end{frame}

    75 \begin{frame}[fragile]

    76 \frametitle{Solution 2}

    77 \label{sec-5}

    78 

    79 \lstset{language=Python}

    80 \begin{lstlisting}

    81 In []: a_str = "     white      space     "

    82 In []: a_str.strip()

    83 \end{lstlisting}

    84 \end{frame}

    85 \begin{frame}

    86 \frametitle{Question 3}

    87 \label{sec-6}

    88 

    89   What happens if you do \texttt{int("1.25")}

    90 \end{frame}

    91 \begin{frame}[fragile]

    92 \frametitle{Solution 3}

    93 \label{sec-7}

    94 

    95   It raises an error since converting a float string into integer

    96   directly is not possible. It involves an intermediate step of

    97   converting to float.

    98 \lstset{language=Python}

    99 \begin{lstlisting}

   100 In []: dcml_str = "1.25"

   101 In []: flt = float(dcml_str)

   102 In []: flt

   103 In []: number = int(flt)

   104 In []: number

   105 \end{lstlisting}

   106 \end{frame}

   107 \begin{frame}

   108 \frametitle{Summary}

   109 \label{sec-8}

   110 

   111 \begin{itemize}

   112 \item How to tokenize a string using various delimiters

   113 \item How to get rid of extra white space around

   114 \item How to convert from one type to another

   115 \item How to parse input data and perform computations on it

   116 \end{itemize}

   117 \end{frame}

   118 \begin{frame}

   119 \frametitle{Thank you!}

   120 \label{sec-9}

   121