1 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

     2 % Tutorial slides on Python.

     3 %

     4 % Author: Prabhu Ramachandran <prabhu at aero.iitb.ac.in>

     5 % Copyright (c) 2005-2009, Prabhu Ramachandran

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

     7 

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

     9 % \documentclass[handout]{beamer}

    10 % \usepackage{pgfpages}

    11 % \pgfpagesuselayout{4 on 1}[a4paper,border, shrink=5mm,landscape]

    12 \usepackage{tikz}

    13 \newcommand{\hyperlinkmovie}{}

    14 %\usepackage{movie15}

    15 

    16 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

    17 % Note that in presentation mode 

    18 % \paperwidth  364.19536pt

    19 % \paperheight 273.14662pt

    20 % h/w = 0.888

    21 

    22 

    23 \mode<presentation>

    24 {

    25   \usetheme{Warsaw}

    26   %\usetheme{Boadilla}

    27   %\usetheme{default}

    28   \useoutertheme{split}

    29   \setbeamercovered{transparent}

    30 }

    31 

    32 % To remove navigation symbols

    33 \setbeamertemplate{navigation symbols}{}

    34 

    35 \usepackage{amsmath}

    36 \usepackage[english]{babel}

    37 \usepackage[latin1]{inputenc}

    38 \usepackage{times}

    39 \usepackage[T1]{fontenc}

    40 

    41 % Taken from Fernando's slides.

    42 \usepackage{ae,aecompl}

    43 \usepackage{mathpazo,courier,euler}

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

    45 \usepackage{pgf}

    46 

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

    48 

    49 \usepackage{listings}

    50 \lstset{language=Python,

    51     basicstyle=\ttfamily\bfseries,

    52     commentstyle=\color{red}\itshape,

    53   stringstyle=\color{darkgreen},

    54   showstringspaces=false,

    55   keywordstyle=\color{blue}\bfseries}

    56 

    57 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

    58 % My Macros

    59 \setbeamercolor{postit}{bg=yellow,fg=black}

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

    61 \newcommand{\emphbar}[1]

    62 {\begin{beamercolorbox}[rounded=true]{emphbar} 

    63       {#1}

    64  \end{beamercolorbox}

    65 }

    66 %{\centerline{\fcolorbox{gray!50} {blue!10}{

    67 %\begin{minipage}{0.9\linewidth}

    68 %    {#1} 

    69 %\end{minipage}

    70 %    }}}

    71 

    72 \newcommand{\myemph}[1]{\structure{\emph{#1}}}

    73 \newcommand{\PythonCode}[1]{\lstinline{#1}}

    74 

    75 \newcommand{\tvtk}{\texttt{tvtk}}

    76 \newcommand{\mlab}{\texttt{mlab}}

    77 

    78 \newcounter{time}

    79 \setcounter{time}{0}

    80 \newcommand{\inctime}[1]{\addtocounter{time}{#1}{\vspace*{0.1in}\tiny \thetime\ m}}

    81 

    82 \newcommand\BackgroundPicture[1]{%

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    84       \parbox[c][\paperheight]{\paperwidth}{%

    85       \vfill \hfill

    86  \hfill \vfill

    87 }}}

    88 

    89 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

    90 % Configuring the theme

    91 %\setbeamercolor{normal text}{fg=white}

    92 %\setbeamercolor{background canvas}{bg=black}

    93 

    94 

    95 

    96 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

    97 % Title page

    98 \title[]{Test Driven Approach}

    99 

   100 \author[FOSSEE Team] {FOSSEE}

   101 

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

   103 \date[] {11, October 2009}

   104 \date[] % (optional)

   105 

   106 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

   107 

   108 %\pgfdeclareimage[height=0.75cm]{iitblogo}{iitblogo}

   109 %\logo{\pgfuseimage{iitblogo}}

   110 

   111 \AtBeginSection[]

   112 {

   113   \begin{frame}<beamer>

   114     \frametitle{Outline}

   115       \Large

   116     \tableofcontents[currentsection,currentsubsection]

   117   \end{frame}

   118 }

   119 

   120 %% Delete this, if you do not want the table of contents to pop up at

   121 %% the beginning of each subsection:

   122 \AtBeginSubsection[]

   123 {

   124   \begin{frame}<beamer>

   125     \frametitle{Outline}

   126     \tableofcontents[currentsection,currentsubsection]

   127   \end{frame}

   128 }

   129 

   130 \AtBeginSection[]

   131 {

   132   \begin{frame}<beamer>

   133     \frametitle{Outline}

   134     \tableofcontents[currentsection,currentsubsection]

   135   \end{frame}

   136 }

   137 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

   138 % DOCUMENT STARTS

   139 \begin{document}

   140 

   141 \begin{frame}

   142   \maketitle

   143 \end{frame}

   144 

   145 

   146 \section{Debugging}

   147 \subsection{Errors and Exceptions}

   148 \begin{frame}[fragile]

   149  \frametitle{Errors}

   150  \begin{lstlisting}

   151 >>> while True print 'Hello world'

   152  \end{lstlisting}

   153 \pause

   154   \begin{lstlisting}

   155   File "<stdin>", line 1, in ?

   156     while True print 'Hello world'

   157                    ^

   158 SyntaxError: invalid syntax

   159 \end{lstlisting}

   160 \end{frame}

   161 

   162 \begin{frame}[fragile]

   163  \frametitle{Exceptions}

   164  \begin{lstlisting}

   165 >>> print spam

   166 \end{lstlisting}

   167 \pause

   168 \begin{lstlisting}

   169 Traceback (most recent call last):

   170   File "<stdin>", line 1, in <module>

   171 NameError: name 'spam' is not defined

   172 \end{lstlisting}

   173 \end{frame}

   174 

   175 \begin{frame}[fragile]

   176  \frametitle{Exceptions}

   177  \begin{lstlisting}

   178 >>> 1 / 0

   179 \end{lstlisting}

   180 \pause

   181 \begin{lstlisting}

   182 Traceback (most recent call last):

   183   File "<stdin>", line 1, in <module>

   184 ZeroDivisionError: integer division 

   185 or modulo by zero

   186 \end{lstlisting}

   187 \end{frame}

   188 

   189 \subsection{Strategy}

   190 \begin{frame}[fragile]

   191     \frametitle{Debugging effectively}

   192     \begin{itemize}

   193         \item \kwrd{print} based strategy

   194         \item Process:

   195     \end{itemize}

   196 \pgfimage[interpolate=true,width=5cm,height=5cm]{DebugginDiagram.png}

   197 \end{frame}

   198 

   199 \begin{frame}[fragile]

   200     \frametitle{Debugging effectively}

   201     \begin{itemize}

   202       \item Using \typ{\%debug} in IPython

   203     \end{itemize}

   204 \end{frame}

   205 

   206 \begin{frame}[fragile]

   207 \frametitle{Debugging in IPython}

   208 \small

   209 \begin{lstlisting}

   210 In [1]: import mymodule

   211 In [2]: mymodule.test()

   212 ---------------------------------------------

   213 NameError   Traceback (most recent call last)

   214 <ipython console> in <module>()

   215 mymodule.py in test()

   216       1 def test():

   217 ----> 2     print spam

   218 NameError: global name 'spam' is not defined

   219 

   220 In [3]: %debug

   221 > mymodule.py(2)test()

   222       0     print spam

   223 ipdb> 

   224 \end{lstlisting}

   225 \inctime{15} 

   226 \end{frame}

   227 

   228 \subsection{Exercise}

   229 \begin{frame}[fragile]

   230 \frametitle{Debugging: Exercise}

   231 \small

   232 \begin{lstlisting}

   233 import keyword

   234 f = open('/path/to/file')

   235 

   236 freq = {}

   237 for line in f:

   238     words = line.split()

   239     for word in words:

   240         key = word.strip(',.!;?()[]: ')

   241         if keyword.iskeyword(key):

   242             value = freq[key]

   243             freq[key] = value + 1

   244 

   245 print freq

   246 \end{lstlisting}

   247 \inctime{10}

   248 \end{frame}

   249 

   250 %% \begin{frame}

   251 %%     \frametitle{Testing}

   252    

   253 %%     \begin{itemize}

   254 %%         \item Writing tests is really simple!

   255 

   256 %%         \item Using nose.

   257 

   258 %%         \item Example!

   259 %%     \end{itemize}

   260 %% \end{frame}

   261 

   262 \section{Test Driven Approach}

   263 \begin{frame}

   264     \frametitle{Need of Testing!}

   265    

   266     \begin{itemize}

   267         \item Quality

   268         \item Regression

   269         \item Documentation

   270     \end{itemize}

   271     %% \vspace*{0.25in}

   272     %% \emphbar{It is to assure that section of code is working as it is supposed to work}

   273 \end{frame}

   274 

   275 \begin{frame}[fragile]

   276     \frametitle{Example}

   277     \begin{block}{Problem Statement}

   278       Write a function to check whether a given input

   279       string is a palindrome.

   280     \end{block}

   281 \end{frame}

   282 

   283 \begin{frame}[fragile]

   284     \frametitle{Function: palindrome.py}

   285 \begin{lstlisting}    

   286 def is_palindrome(input_str):

   287   return input_str == input_str[::-1]

   288 \end{lstlisting}    

   289 \end{frame}

   290 

   291 \begin{frame}[fragile]

   292     \frametitle{Test for the palindrome: palindrome.py}

   293 \begin{lstlisting}    

   294 from plaindrome import is_palindrome

   295 def test_function_normal_words():

   296   input = "noon"

   297   assert is_palindrome(input) == True

   298 \end{lstlisting}    

   299 \end{frame}

   300 

   301 \begin{frame}[fragile]

   302     \frametitle{Running the tests.}

   303 \begin{lstlisting}    

   304 $ nosetests test.py 

   305 .

   306 ----------------------------------------------

   307 Ran 1 test in 0.001s

   308 

   309 OK

   310 \end{lstlisting}    

   311 \end{frame}

   312 

   313 \begin{frame}[fragile]

   314     \frametitle{Exercise: Including new tests.}

   315 \begin{lstlisting}    

   316 def test_function_ignore_cases_words():

   317   input = "Noon"

   318   assert is_palindrome(input) == True

   319 \end{lstlisting}

   320      \vspace*{0.25in}

   321      Check\\

   322      \PythonCode{$ nosetests test.py} \\

   323      \begin{block}{Task}

   324      Tweak the code to pass this test.

   325      \end{block}

   326 \end{frame}

   327 

   328 %\begin{frame}[fragile]

   329 %    \frametitle{Lets write some test!}

   330 %\begin{lstlisting}    

   331 %#for form of equation y=mx+c

   332 %#given m and c for two equation,

   333 %#finding the intersection point.

   334 %def intersect(m1,c1,m2,c2):

   335 %    x = (c2-c1)/(m1-m2)

   336 %    y = m1*x+c1

   337 %    return (x,y)

   338 %\end{lstlisting}

   339 %

   340 %Create a simple test for this

   341 %

   342 %function which will make it fail.

   343 %

   344 %\inctime{15} 

   345 %\end{frame}

   346 %

   347 

   348 \begin{frame}[fragile]

   349     \frametitle{Exercise}

   350     Based on Euclid's algorithm:

   351     \begin{center}

   352     $gcd(a,b)=gcd(b,b\%a)$

   353     \end{center}

   354     gcd function can be written as:

   355     \begin{lstlisting}

   356     def gcd(a, b):

   357       if a%b == 0: return b

   358       return gcd(b, a%b)

   359     \end{lstlisting}

   360     \vspace*{-0.15in}

   361     \begin{block}{Task}

   362       \begin{itemize}

   363       \item Write at least 

   364         two tests for above mentioned function.

   365       \item Write a non recursive implementation

   366       of gcd(), and test it using already 

   367       written tests.

   368       \end{itemize}

   369     \end{block}

   370     

   371 \inctime{15} 

   372 \end{frame}

   373 

   374 \end{document}