day1/Session-4.tex
author Madhusudan.C.S <madhusudancs@gmail.com>
Wed, 07 Oct 2009 15:08:16 +0530
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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[14pt,compress]{beamer}
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%\documentclass[draft]{beamer}
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%\documentclass[compress,handout]{beamer}
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%\usepackage{pgfpages} 
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%\pgfpagesuselayout{2 on 1}[a4paper,border shrink=5mm]
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% Modified from: generic-ornate-15min-45min.de.tex
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\mode<presentation>
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{
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  \usetheme{Warsaw}
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  \useoutertheme{split}
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  \setbeamercovered{transparent}
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}
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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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\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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% Macros
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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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\newcounter{time}
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\setcounter{time}{0}
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\newcommand{\inctime}[1]{\addtocounter{time}{#1}{\tiny \thetime\ m}}
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\newcommand{\typ}[1]{\texttt{#1}}
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\newcommand{\kwrd}[1]{ \texttt{\textbf{\color{blue}{#1}}}  }
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%%% This is from Fernando's setup.
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% \usepackage{color}
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% \definecolor{orange}{cmyk}{0,0.4,0.8,0.2}
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% % Use and configure listings package for nicely formatted code
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% \usepackage{listings}
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% \lstset{
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%    language=Python,
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%    basicstyle=\small\ttfamily,
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%    commentstyle=\ttfamily\color{blue},
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%    stringstyle=\ttfamily\color{orange},
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%    showstringspaces=false,
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%    breaklines=true,
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%    postbreak = \space\dots
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% }
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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% Title page
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\title[Basic Python]{Python:\\Advanced Python data structures, Functions and Debugging}
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\author[FOSSEE Team] {Asokan Pichai\\Prabhu Ramachandran}
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\institute[IIT Bombay] {Department of Aerospace Engineering\\IIT Bombay}
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\date[] {10, October 2009\\Day 1, Session 4}
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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%\pgfdeclareimage[height=0.75cm]{iitmlogo}{iitmlogo}
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%\logo{\pgfuseimage{iitmlogo}}
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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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% If you wish to uncover everything in a step-wise fashion, uncomment
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% the following command: 
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%\beamerdefaultoverlayspecification{<+->}
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%\includeonlyframes{current,current1,current2,current3,current4,current5,current6}
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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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  \titlepage
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\end{frame}
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\section{Python}
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\subsection{Dictionary}
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\begin{frame}{Dictionary}
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  \begin{itemize}
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    \item aka associative arrays, key-value pairs, hashmaps, hashtables \ldots    
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    \item \typ{ d = \{ ``Hitchhiker's guide'' : 42, ``Terminator'' : ``I'll be back''\}}
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    \item lists and tuples index: 0 \ldots n
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    \item dictionaries index using strings
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    \item aka key-value pairs
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    \item what can be keys?
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  \end{itemize}
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\end{frame}
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\begin{frame}{Dictionary \ldots }
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  \begin{itemize}
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    \item \alert{Unordered}
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      \begin{block}{Standard usage}
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        for key in dict:\\
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            <use> dict[key] \# => value
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      \end{block}
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    \item \typ{d.keys()} returns a list
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    \item can we have duplicate keys?
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  \end{itemize}
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  \inctime{5}
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\end{frame}
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\begin{frame} {Problem Set 2.1}
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  \begin{description}
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\item[2.1.1] You are given date strings of the form ``29, Jul 2009'', or ``4 January 2008''. In other words a number a string and another number, with a comma sometimes separating the items.Write a function that takes such a string and returns a tuple (yyyy, mm, dd) where all three elements are ints.
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    \item[2.1.2] Count word frequencies in a file.
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    \item[2.1.3] Find the most used Python keywords in your Python code (import keyword).
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\end{description}
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\inctime{10}
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\end{frame}
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\subsection{Set}
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\begin{frame}[fragile]
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  \frametitle{Set}
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    \begin{itemize}
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      \item Simplest container, mutable
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      \item No ordering, no duplicates
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      \item usual suspects: union, intersection, subset \ldots
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      \item >, >=, <, <=, in, \ldots
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    \end{itemize}
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    \begin{lstlisting}
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>>> f10 = set([1,2,3,5,8])
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>>> p10 = set([2,3,5,7])
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>>> f10|p10
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set([1, 2, 3, 5, 7, 8])
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>>> f10&p10
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set([2, 3, 5])
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>>> f10-p10
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set([8, 1])
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\end{lstlisting}
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\end{frame}
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\begin{frame}[fragile]
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  \frametitle{Set}
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    \begin{lstlisting}
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>>> p10-f10, f10^p10
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set([7]), set([1, 7, 8])
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>>> set([2,3]) < p10
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True
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>>> set([2,3]) <= p10
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True
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>>> 2 in p10
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True
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>>> 4 in p10
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False
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>>> len(f10)
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5
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\end{lstlisting}
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\inctime{5}
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\end{frame}
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\begin{frame}
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  \frametitle{Problem set 2.2}
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  \begin{description}
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    \item[2.2.1] Given a dictionary of the names of students and their marks, identify how many duplicate marks are there? and what are these?
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    \item[2.2.2] Given a string of the form ``4-7, 9, 12, 15'' find the numbers missing in this list for a given range.
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\end{description}
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\inctime{10}
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\end{frame}
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\subsection{Functions Reloaded!}
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\begin{frame}[fragile]
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    \frametitle{Advanced functions}
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    \begin{itemize}
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        \item default args
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        \item var args
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        \item keyword args
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        \item scope
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        \item \typ{global}
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      \end{itemize}
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\end{frame}
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\begin{frame}[fragile]
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  \frametitle{Functions: default arguments}
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  \small
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  \begin{lstlisting}
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def ask_ok(prompt, complaint='Yes or no!'):
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    while True:
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        ok = raw_input(prompt)
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        if ok in ('y', 'ye', 'yes'): 
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            return True
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        if ok in ('n', 'no', 'nop',
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                  'nope'): 
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            return False
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        print complaint
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ask_ok('?')
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ask_ok('?', '[Y/N]')
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  \end{lstlisting}
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\end{frame}
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\begin{frame}[fragile]
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  \frametitle{Functions: keyword arguments}
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  \small
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  \begin{lstlisting}
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def ask_ok(prompt, complaint='Yes or no!'):
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    while True:
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        ok = raw_input(prompt)
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        if ok in ('y', 'ye', 'yes'): 
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            return True
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        if ok in ('n', 'no', 'nop',
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                  'nope'): 
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            return False
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        print complaint
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ask_ok(prompt='?')
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ask_ok(prompt='?', complaint='[Y/N]')
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ask_ok(complaint='[Y/N]', prompt='?')
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\end{lstlisting}
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\inctime{15} 
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\end{frame}
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\subsection{Functional programming}
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\begin{frame}[fragile]
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    \frametitle{Functional programming}
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What is the basic idea?\\
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Why is it interesting?\\
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\typ{map, reduce, filter}\\
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list comprehension\\
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generators
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\end{frame}
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\begin{frame}[fragile]
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    \frametitle{List Comprehensions}
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Lets say we want to squares of all the numbers from 1 to 100
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    \begin{lstlisting}
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squares = []
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for i in range(1, 100):
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    squares.append(i * i)
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    \end{lstlisting}
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    \begin{lstlisting}
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# list comprehension
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squares = [i*i for i in range(1, 100)]
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     \end{lstlisting}
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Which is more readable?
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\end{frame}
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\begin{frame}[fragile]
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    \frametitle{List Comprehensions}
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What if you had a more complex function?
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Lets say we want squares of numbers from 1 to 100 ending in 1, 2, 5, 7 only
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    \begin{lstlisting}
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squares = []
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for i in range(1, 100):
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    if i % 10 in [1, 2, 5, 7]:
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        squares.append(i * i)
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    \end{lstlisting}
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    \begin{lstlisting}
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# list comprehension
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squares = [i*i for i in range(1, 100)
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           if i % 10 in [1, 2, 5, 7]]
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     \end{lstlisting}
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Which is more readable?
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\inctime{15}
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\end{frame}
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\subsection{Debugging}
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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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  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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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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>>> 1 / 0
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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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\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: Hypothesis, test, refine, rinse-repeat
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        \item Using \typ{\%debug} and \typ{\%pdb} 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: example}
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\small
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\begin{lstlisting}
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>>> import pdb
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>>> import mymodule
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>>> pdb.run('mymodule.test()')
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> <string>(1)<module>()
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(Pdb) continue
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Traceback (most recent call last):
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  File "<stdin>", line 1, in <module>
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  File "/usr/lib/python2.6/pdb.py", line 1207, in run
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    Pdb().run(statement, globals, locals)
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  File "/usr/lib/python2.6/bdb.py", line 368, in run
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    exec cmd in globals, locals
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  File "<string>", line 1, in <module>
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  File "mymodule.py", line 2, in test
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    print spam
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NameError: global 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{Debugging in IPython}
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\small
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\begin{lstlisting}
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In [1]: %pdb
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Automatic pdb calling has been turned ON
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In [2]: import mymodule
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In [3]: mymodule.test()
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----------------------------------------------
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NameError    Traceback (most recent call last)
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/media/python/iitb/workshops/day1/<ipython console> in <module>()
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/media/python/iitb/workshops/day1/mymodule.pyc 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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> /media/python/iitb/workshops/day1/mymodule.py(2)test()
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      0     print spam
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ipdb>
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\end{lstlisting}
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\inctime{15} 
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\end{frame}
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\begin{frame}[fragile]
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\frametitle{Debugging: Exercise}
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\inctime{10}
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\end{frame}
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\begin{frame}
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  \frametitle{What did we learn?}
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  \begin{itemize}
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    \item Creating and using Dictionaries
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    \item Creating and using Sets
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    \item Advances Functions: default arguments, keyword arguments
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    \item Functional Programming, list comprehensions
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    \item Errors and Exceptions in Python
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    \item Debugging: How to use pdb, \%pdb and \%debug in IPython
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  \end{itemize}
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\end{frame}
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\end{document}