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+++ b/day2/session4.tex Wed Oct 28 14:25:03 2009 +0530
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+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+% Tutorial slides on Python.
+%
+% Author: Prabhu Ramachandran <prabhu at aero.iitb.ac.in>
+% Copyright (c) 2005-2009, Prabhu Ramachandran
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+
+\documentclass[compress,14pt]{beamer}
+% \documentclass[handout]{beamer}
+% \usepackage{pgfpages}
+% \pgfpagesuselayout{4 on 1}[a4paper,border, shrink=5mm,landscape]
+\usepackage{tikz}
+\newcommand{\hyperlinkmovie}{}
+%\usepackage{movie15}
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+% Note that in presentation mode
+% \paperwidth 364.19536pt
+% \paperheight 273.14662pt
+% h/w = 0.888
+
+
+\mode<presentation>
+{
+ \usetheme{Warsaw}
+ %\usetheme{Boadilla}
+ %\usetheme{default}
+ \useoutertheme{split}
+ \setbeamercovered{transparent}
+}
+
+% To remove navigation symbols
+\setbeamertemplate{navigation symbols}{}
+
+\usepackage{amsmath}
+\usepackage[english]{babel}
+\usepackage[latin1]{inputenc}
+\usepackage{times}
+\usepackage[T1]{fontenc}
+
+% Taken from Fernando's slides.
+\usepackage{ae,aecompl}
+\usepackage{mathpazo,courier,euler}
+\usepackage[scaled=.95]{helvet}
+\usepackage{pgf}
+
+\definecolor{darkgreen}{rgb}{0,0.5,0}
+
+\usepackage{listings}
+\lstset{language=Python,
+ basicstyle=\ttfamily\bfseries,
+ commentstyle=\color{red}\itshape,
+ stringstyle=\color{darkgreen},
+ showstringspaces=false,
+ keywordstyle=\color{blue}\bfseries}
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+% My Macros
+\setbeamercolor{postit}{bg=yellow,fg=black}
+\setbeamercolor{emphbar}{bg=blue!20, fg=black}
+\newcommand{\emphbar}[1]
+{\begin{beamercolorbox}[rounded=true]{emphbar}
+ {#1}
+ \end{beamercolorbox}
+}
+%{\centerline{\fcolorbox{gray!50} {blue!10}{
+%\begin{minipage}{0.9\linewidth}
+% {#1}
+%\end{minipage}
+% }}}
+
+\newcommand{\myemph}[1]{\structure{\emph{#1}}}
+\newcommand{\PythonCode}[1]{\lstinline{#1}}
+
+\newcommand{\tvtk}{\texttt{tvtk}}
+\newcommand{\mlab}{\texttt{mlab}}
+
+\newcounter{time}
+\setcounter{time}{0}
+\newcommand{\inctime}[1]{\addtocounter{time}{#1}{\vspace*{0.1in}\tiny \thetime\ m}}
+
+\newcommand\BackgroundPicture[1]{%
+ \setbeamertemplate{background}{%
+ \parbox[c][\paperheight]{\paperwidth}{%
+ \vfill \hfill
+ \hfill \vfill
+}}}
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+% Configuring the theme
+%\setbeamercolor{normal text}{fg=white}
+%\setbeamercolor{background canvas}{bg=black}
+
+
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+% Title page
+\title[]{Test Driven Approach}
+
+\author[FOSSEE Team] {FOSSEE}
+
+\institute[IIT Bombay] {Department of Aerospace Engineering\\IIT Bombay}
+\date[] {11, October 2009}
+\date[] % (optional)
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+
+%\pgfdeclareimage[height=0.75cm]{iitblogo}{iitblogo}
+%\logo{\pgfuseimage{iitblogo}}
+
+\AtBeginSection[]
+{
+ \begin{frame}<beamer>
+ \frametitle{Outline}
+ \Large
+ \tableofcontents[currentsection,currentsubsection]
+ \end{frame}
+}
+
+%% Delete this, if you do not want the table of contents to pop up at
+%% the beginning of each subsection:
+\AtBeginSubsection[]
+{
+ \begin{frame}<beamer>
+ \frametitle{Outline}
+ \tableofcontents[currentsection,currentsubsection]
+ \end{frame}
+}
+
+\AtBeginSection[]
+{
+ \begin{frame}<beamer>
+ \frametitle{Outline}
+ \tableofcontents[currentsection,currentsubsection]
+ \end{frame}
+}
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+% DOCUMENT STARTS
+\begin{document}
+
+\begin{frame}
+ \maketitle
+\end{frame}
+
+
+\section{Debugging}
+\subsection{Errors and Exceptions}
+\begin{frame}[fragile]
+ \frametitle{Errors}
+ \begin{lstlisting}
+>>> while True print 'Hello world'
+ \end{lstlisting}
+\pause
+ \begin{lstlisting}
+ File "<stdin>", line 1, in ?
+ while True print 'Hello world'
+ ^
+SyntaxError: invalid syntax
+\end{lstlisting}
+\end{frame}
+
+\begin{frame}[fragile]
+ \frametitle{Exceptions}
+ \begin{lstlisting}
+>>> print spam
+\end{lstlisting}
+\pause
+\begin{lstlisting}
+Traceback (most recent call last):
+ File "<stdin>", line 1, in <module>
+NameError: name 'spam' is not defined
+\end{lstlisting}
+\end{frame}
+
+\begin{frame}[fragile]
+ \frametitle{Exceptions}
+ \begin{lstlisting}
+>>> 1 / 0
+\end{lstlisting}
+\pause
+\begin{lstlisting}
+Traceback (most recent call last):
+ File "<stdin>", line 1, in <module>
+ZeroDivisionError: integer division
+or modulo by zero
+\end{lstlisting}
+\end{frame}
+
+\subsection{Strategy}
+\begin{frame}[fragile]
+ \frametitle{Debugging effectively}
+ \begin{itemize}
+ \item \kwrd{print} based strategy
+ \item Process:
+ \end{itemize}
+\pgfimage[interpolate=true,width=5cm,height=5cm]{DebugginDiagram.png}
+\end{frame}
+
+\begin{frame}[fragile]
+ \frametitle{Debugging effectively}
+ \begin{itemize}
+ \item Using \typ{\%debug} in IPython
+ \end{itemize}
+\end{frame}
+
+\begin{frame}[fragile]
+\frametitle{Debugging in IPython}
+\small
+\begin{lstlisting}
+In [1]: import mymodule
+In [2]: mymodule.test()
+---------------------------------------------
+NameError Traceback (most recent call last)
+<ipython console> in <module>()
+mymodule.py in test()
+ 1 def test():
+----> 2 print spam
+NameError: global name 'spam' is not defined
+
+In [3]: %debug
+> mymodule.py(2)test()
+ 0 print spam
+ipdb>
+\end{lstlisting}
+\inctime{15}
+\end{frame}
+
+\subsection{Exercise}
+\begin{frame}[fragile]
+\frametitle{Debugging: Exercise}
+\small
+\begin{lstlisting}
+import keyword
+f = open('/path/to/file')
+
+freq = {}
+for line in f:
+ words = line.split()
+ for word in words:
+ key = word.strip(',.!;?()[]: ')
+ if keyword.iskeyword(key):
+ value = freq[key]
+ freq[key] = value + 1
+
+print freq
+\end{lstlisting}
+\inctime{10}
+\end{frame}
+
+%% \begin{frame}
+%% \frametitle{Testing}
+
+%% \begin{itemize}
+%% \item Writing tests is really simple!
+
+%% \item Using nose.
+
+%% \item Example!
+%% \end{itemize}
+%% \end{frame}
+
+\section{Test Driven Approach}
+\begin{frame}
+ \frametitle{Need of Testing!}
+
+ \begin{itemize}
+ \item Quality
+ \item Regression
+ \item Documentation
+ \end{itemize}
+ %% \vspace*{0.25in}
+ %% \emphbar{It is to assure that section of code is working as it is supposed to work}
+\end{frame}
+
+\begin{frame}[fragile]
+ \frametitle{Example}
+ \begin{block}{Problem Statement}
+ Write a function to check whether a given input
+ string is a palindrome.
+ \end{block}
+\end{frame}
+
+\begin{frame}[fragile]
+ \frametitle{Function: palindrome.py}
+\begin{lstlisting}
+def is_palindrome(input_str):
+ return input_str == input_str[::-1]
+\end{lstlisting}
+\end{frame}
+
+\begin{frame}[fragile]
+ \frametitle{Test for the palindrome: palindrome.py}
+\begin{lstlisting}
+from plaindrome import is_palindrome
+def test_function_normal_words():
+ input = "noon"
+ assert is_palindrome(input) == True
+\end{lstlisting}
+\end{frame}
+
+\begin{frame}[fragile]
+ \frametitle{Running the tests.}
+\begin{lstlisting}
+$ nosetests test.py
+.
+----------------------------------------------
+Ran 1 test in 0.001s
+
+OK
+\end{lstlisting}
+\end{frame}
+
+\begin{frame}[fragile]
+ \frametitle{Exercise: Including new tests.}
+\begin{lstlisting}
+def test_function_ignore_cases_words():
+ input = "Noon"
+ assert is_palindrome(input) == True
+\end{lstlisting}
+ \vspace*{0.25in}
+ Check\\
+ \PythonCode{$ nosetests test.py} \\
+ \begin{block}{Task}
+ Tweak the code to pass this test.
+ \end{block}
+\end{frame}
+
+%\begin{frame}[fragile]
+% \frametitle{Lets write some test!}
+%\begin{lstlisting}
+%#for form of equation y=mx+c
+%#given m and c for two equation,
+%#finding the intersection point.
+%def intersect(m1,c1,m2,c2):
+% x = (c2-c1)/(m1-m2)
+% y = m1*x+c1
+% return (x,y)
+%\end{lstlisting}
+%
+%Create a simple test for this
+%
+%function which will make it fail.
+%
+%\inctime{15}
+%\end{frame}
+%
+
+\begin{frame}[fragile]
+ \frametitle{Exercise}
+ Based on Euclid's algorithm:
+ \begin{center}
+ $gcd(a,b)=gcd(b,b\%a)$
+ \end{center}
+ gcd function can be written as:
+ \begin{lstlisting}
+ def gcd(a, b):
+ if a%b == 0: return b
+ return gcd(b, a%b)
+ \end{lstlisting}
+ \vspace*{-0.15in}
+ \begin{block}{Task}
+ \begin{itemize}
+ \item Write at least
+ two tests for above mentioned function.
+ \item Write a non recursive implementation
+ of gcd(), and test it using already
+ written tests.
+ \end{itemize}
+ \end{block}
+
+\inctime{15}
+\end{frame}
+
+\end{document}