day2/session4.tex
author Santosh G. Vattam <vattam.santosh@gmail.com>
Wed, 28 Oct 2009 14:44:47 +0530
changeset 232 b9748af050c4
parent 219 f6725f6bee41
child 220 15306dad3b81
permissions -rw-r--r--
Updated the session 4, day 1 slides.
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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% Tutorial slides on Python.
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%
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% Author: Prabhu Ramachandran <prabhu at aero.iitb.ac.in>
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% Copyright (c) 2005-2009, Prabhu Ramachandran
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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\documentclass[compress,14pt]{beamer}
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% \documentclass[handout]{beamer}
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% \usepackage{pgfpages}
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% \pgfpagesuselayout{4 on 1}[a4paper,border, shrink=5mm,landscape]
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\usepackage{tikz}
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\newcommand{\hyperlinkmovie}{}
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%\usepackage{movie15}
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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% Note that in presentation mode 
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% \paperwidth  364.19536pt
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% \paperheight 273.14662pt
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% h/w = 0.888
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\mode<presentation>
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{
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  \usetheme{Warsaw}
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  %\usetheme{Boadilla}
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  %\usetheme{default}
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  \useoutertheme{split}
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  \setbeamercovered{transparent}
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}
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% To remove navigation symbols
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\setbeamertemplate{navigation symbols}{}
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\usepackage{amsmath}
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\usepackage[english]{babel}
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\usepackage[latin1]{inputenc}
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\usepackage{times}
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\usepackage[T1]{fontenc}
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% Taken from Fernando's slides.
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\usepackage{ae,aecompl}
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\usepackage{mathpazo,courier,euler}
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\usepackage[scaled=.95]{helvet}
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\usepackage{pgf}
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\definecolor{darkgreen}{rgb}{0,0.5,0}
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\usepackage{listings}
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\lstset{language=Python,
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    basicstyle=\ttfamily\bfseries,
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    commentstyle=\color{red}\itshape,
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  stringstyle=\color{darkgreen},
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  showstringspaces=false,
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  keywordstyle=\color{blue}\bfseries}
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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% My Macros
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\setbeamercolor{postit}{bg=yellow,fg=black}
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\setbeamercolor{emphbar}{bg=blue!20, fg=black}
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\newcommand{\emphbar}[1]
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{\begin{beamercolorbox}[rounded=true]{emphbar} 
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      {#1}
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 \end{beamercolorbox}
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}
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%{\centerline{\fcolorbox{gray!50} {blue!10}{
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%\begin{minipage}{0.9\linewidth}
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%    {#1} 
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%\end{minipage}
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%    }}}
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\newcommand{\myemph}[1]{\structure{\emph{#1}}}
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\newcommand{\PythonCode}[1]{\lstinline{#1}}
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\newcommand{\tvtk}{\texttt{tvtk}}
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\newcommand{\mlab}{\texttt{mlab}}
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\newcounter{time}
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\setcounter{time}{0}
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\newcommand{\inctime}[1]{\addtocounter{time}{#1}{\vspace*{0.1in}\tiny \thetime\ m}}
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\newcommand\BackgroundPicture[1]{%
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  \setbeamertemplate{background}{%
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      \parbox[c][\paperheight]{\paperwidth}{%
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      \vfill \hfill
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 \hfill \vfill
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}}}
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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% Configuring the theme
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%\setbeamercolor{normal text}{fg=white}
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%\setbeamercolor{background canvas}{bg=black}
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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% Title page
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\title[]{Test Driven Approach}
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\author[FOSSEE Team] {FOSSEE}
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\institute[IIT Bombay] {Department of Aerospace Engineering\\IIT Bombay}
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\date[] {11, October 2009}
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\date[] % (optional)
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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%\pgfdeclareimage[height=0.75cm]{iitblogo}{iitblogo}
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%\logo{\pgfuseimage{iitblogo}}
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\AtBeginSection[]
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{
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  \begin{frame}<beamer>
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    \frametitle{Outline}
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      \Large
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    \tableofcontents[currentsection,currentsubsection]
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  \end{frame}
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}
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%% Delete this, if you do not want the table of contents to pop up at
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%% the beginning of each subsection:
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\AtBeginSubsection[]
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{
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  \begin{frame}<beamer>
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    \frametitle{Outline}
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    \tableofcontents[currentsection,currentsubsection]
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  \end{frame}
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}
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\AtBeginSection[]
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{
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  \begin{frame}<beamer>
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    \frametitle{Outline}
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    \tableofcontents[currentsection,currentsubsection]
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  \end{frame}
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}
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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% DOCUMENT STARTS
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\begin{document}
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\begin{frame}
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  \maketitle
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\end{frame}
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\section{Debugging}
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\subsection{Errors and Exceptions}
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\begin{frame}[fragile]
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 \frametitle{Errors}
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 \begin{lstlisting}
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>>> while True print 'Hello world'
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 \end{lstlisting}
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\pause
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  \begin{lstlisting}
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  File "<stdin>", line 1, in ?
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    while True print 'Hello world'
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                   ^
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SyntaxError: invalid syntax
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\end{lstlisting}
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\end{frame}
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\begin{frame}[fragile]
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 \frametitle{Exceptions}
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 \begin{lstlisting}
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>>> print spam
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\end{lstlisting}
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\pause
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\begin{lstlisting}
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Traceback (most recent call last):
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  File "<stdin>", line 1, in <module>
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NameError: name 'spam' is not defined
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\end{lstlisting}
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\end{frame}
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\begin{frame}[fragile]
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 \frametitle{Exceptions}
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 \begin{lstlisting}
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>>> 1 / 0
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\end{lstlisting}
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\pause
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\begin{lstlisting}
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Traceback (most recent call last):
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  File "<stdin>", line 1, in <module>
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ZeroDivisionError: integer division 
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or modulo by zero
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\end{lstlisting}
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\end{frame}
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\subsection{Strategy}
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\begin{frame}[fragile]
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    \frametitle{Debugging effectively}
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    \begin{itemize}
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        \item \kwrd{print} based strategy
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        \item Process:
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    \end{itemize}
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\pgfimage[interpolate=true,width=5cm,height=5cm]{DebugginDiagram.png}
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\end{frame}
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\begin{frame}[fragile]
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    \frametitle{Debugging effectively}
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    \begin{itemize}
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      \item Using \typ{\%debug} in IPython
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    \end{itemize}
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\end{frame}
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\begin{frame}[fragile]
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\frametitle{Debugging in IPython}
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\small
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\begin{lstlisting}
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In [1]: import mymodule
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In [2]: mymodule.test()
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---------------------------------------------
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NameError   Traceback (most recent call last)
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<ipython console> in <module>()
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mymodule.py in test()
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      1 def test():
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----> 2     print spam
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NameError: global name 'spam' is not defined
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In [3]: %debug
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> mymodule.py(2)test()
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      0     print spam
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ipdb> 
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   224
\end{lstlisting}
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\inctime{15} 
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\end{frame}
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f6725f6bee41 Session 4, Debugging and Testing.
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   228
\subsection{Exercise}
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   229
\begin{frame}[fragile]
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\frametitle{Debugging: Exercise}
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   231
\small
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   232
\begin{lstlisting}
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import keyword
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   234
f = open('/path/to/file')
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f6725f6bee41 Session 4, Debugging and Testing.
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   236
freq = {}
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   237
for line in f:
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   238
    words = line.split()
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   239
    for word in words:
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   240
        key = word.strip(',.!;?()[]: ')
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   241
        if keyword.iskeyword(key):
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   242
            value = freq[key]
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   243
            freq[key] = value + 1
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   244
f6725f6bee41 Session 4, Debugging and Testing.
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   245
print freq
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   246
\end{lstlisting}
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   247
\inctime{10}
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   248
\end{frame}
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   249
f6725f6bee41 Session 4, Debugging and Testing.
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   250
%% \begin{frame}
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   251
%%     \frametitle{Testing}
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   252
   
f6725f6bee41 Session 4, Debugging and Testing.
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   253
%%     \begin{itemize}
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   254
%%         \item Writing tests is really simple!
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f6725f6bee41 Session 4, Debugging and Testing.
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   256
%%         \item Using nose.
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   257
f6725f6bee41 Session 4, Debugging and Testing.
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   258
%%         \item Example!
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   259
%%     \end{itemize}
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   260
%% \end{frame}
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   261
f6725f6bee41 Session 4, Debugging and Testing.
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   262
\section{Test Driven Approach}
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   263
\begin{frame}
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   264
    \frametitle{Need of Testing!}
f6725f6bee41 Session 4, Debugging and Testing.
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   265
   
f6725f6bee41 Session 4, Debugging and Testing.
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   266
    \begin{itemize}
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   267
        \item Quality
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   268
        \item Regression
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   269
        \item Documentation
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   270
    \end{itemize}
f6725f6bee41 Session 4, Debugging and Testing.
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   271
    %% \vspace*{0.25in}
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   272
    %% \emphbar{It is to assure that section of code is working as it is supposed to work}
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   273
\end{frame}
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   274
f6725f6bee41 Session 4, Debugging and Testing.
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   275
\begin{frame}[fragile]
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   276
    \frametitle{Example}
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   277
    \begin{block}{Problem Statement}
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   278
      Write a function to check whether a given input
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   279
      string is a palindrome.
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   280
    \end{block}
f6725f6bee41 Session 4, Debugging and Testing.
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   281
\end{frame}
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   282
f6725f6bee41 Session 4, Debugging and Testing.
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   283
\begin{frame}[fragile]
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   284
    \frametitle{Function: palindrome.py}
f6725f6bee41 Session 4, Debugging and Testing.
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   285
\begin{lstlisting}    
f6725f6bee41 Session 4, Debugging and Testing.
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   286
def is_palindrome(input_str):
f6725f6bee41 Session 4, Debugging and Testing.
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   287
  return input_str == input_str[::-1]
f6725f6bee41 Session 4, Debugging and Testing.
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   288
\end{lstlisting}    
f6725f6bee41 Session 4, Debugging and Testing.
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   289
\end{frame}
f6725f6bee41 Session 4, Debugging and Testing.
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diff changeset
   290
f6725f6bee41 Session 4, Debugging and Testing.
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   291
\begin{frame}[fragile]
f6725f6bee41 Session 4, Debugging and Testing.
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   292
    \frametitle{Test for the palindrome: palindrome.py}
f6725f6bee41 Session 4, Debugging and Testing.
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diff changeset
   293
\begin{lstlisting}    
f6725f6bee41 Session 4, Debugging and Testing.
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   294
from plaindrome import is_palindrome
f6725f6bee41 Session 4, Debugging and Testing.
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   295
def test_function_normal_words():
f6725f6bee41 Session 4, Debugging and Testing.
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   296
  input = "noon"
f6725f6bee41 Session 4, Debugging and Testing.
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  assert is_palindrome(input) == True
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\end{lstlisting}    
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\end{frame}
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\begin{frame}[fragile]
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    \frametitle{Running the tests.}
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\begin{lstlisting}    
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$ nosetests test.py 
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.
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----------------------------------------------
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Ran 1 test in 0.001s
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OK
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\end{lstlisting}    
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\end{frame}
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\begin{frame}[fragile]
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    \frametitle{Exercise: Including new tests.}
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\begin{lstlisting}    
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def test_function_ignore_cases_words():
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  input = "Noon"
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  assert is_palindrome(input) == True
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\end{lstlisting}
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     \vspace*{0.25in}
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     Check\\
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     \PythonCode{$ nosetests test.py} \\
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     \begin{block}{Task}
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     Tweak the code to pass this test.
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     \end{block}
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\end{frame}
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%\begin{frame}[fragile]
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%    \frametitle{Lets write some test!}
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%\begin{lstlisting}    
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%#for form of equation y=mx+c
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%#given m and c for two equation,
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%#finding the intersection point.
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%def intersect(m1,c1,m2,c2):
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%    x = (c2-c1)/(m1-m2)
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%    y = m1*x+c1
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%    return (x,y)
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%\end{lstlisting}
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%
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%Create a simple test for this
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%
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%function which will make it fail.
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%
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%\inctime{15} 
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%\end{frame}
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%
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\begin{frame}[fragile]
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    \frametitle{Exercise}
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    Based on Euclid's algorithm:
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    \begin{center}
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    $gcd(a,b)=gcd(b,b\%a)$
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    \end{center}
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    gcd function can be written as:
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    \begin{lstlisting}
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    def gcd(a, b):
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      if a%b == 0: return b
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      return gcd(b, a%b)
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    \end{lstlisting}
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    \vspace*{-0.15in}
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    \begin{block}{Task}
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      \begin{itemize}
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      \item Write at least 
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        two tests for above mentioned function.
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      \item Write a non recursive implementation
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      of gcd(), and test it using already 
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      written tests.
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      \end{itemize}
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    \end{block}
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\inctime{15} 
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\end{frame}
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\end{document}