day1/Session-2.tex
author Madhusudan.C.S <madhusudancs@gmail.com>
Wed, 07 Oct 2009 14:42:38 +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:\\Functions and basic data structures}
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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 2}
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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{Exercises on Control flow}
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\begin{frame}
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  \frametitle{Problem set 1}
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  \begin{itemize}
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    \item All the problems can be\\
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      solved using \kwrd{if} and \kwrd{while} 
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  \end{itemize}
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\end{frame}
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\begin{frame}{Problem 1.1}
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  Write a program that displays all three digit numbers that are equal to the sum of the cubes of their digits. That is, print numbers $abc$ that have the property $abc = a^3 + b^3 + c^3$\\
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These are called $Armstrong$ numbers.
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\end{frame}
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\begin{frame}{Problem 1.2 - Collatz sequence}
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\begin{enumerate}
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  \item Start with an arbitrary (positive) integer. 
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  \item If the number is even, divide by 2; if the number is odd, multiply by 3 and add 1.
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  \item Repeat the procedure with the new number.
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  \item It appears that for all starting values there is a cycle of 4, 2, 1 at which the procedure loops.
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\end{enumerate}
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    Write a program that accepts the starting value and prints out the Collatz sequence.
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\end{frame}
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\begin{frame}[fragile]{Problem 1.4}
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  Write a program that prints the following pyramid on the screen. 
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  \begin{lstlisting}
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1
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2  2
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3  3  3
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4  4  4  4
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  \end{lstlisting}
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The number of lines must be obtained from the user as input.\\
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\pause
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When can your code fail?
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\only<2->{\inctime{20}}
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\end{frame}
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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% TIME: 20 m, running 20m 
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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\subsection{Functions}
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\begin{frame}[fragile]
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\frametitle{Functions: examples}
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  \begin{lstlisting}
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def signum( r ):
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    """returns 0 if r is zero
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    -1 if r is negative
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    +1 if r is positive"""
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    if r < 0:
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        return -1
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    elif r > 0:
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        return 1
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    else:
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        return 0
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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: examples}
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  \begin{lstlisting}
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def pad( n, size ): 
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    """pads integer n with spaces
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    into a string of length size
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    """
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    SPACE = ' '
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    s = str( n )
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    padSize = size - len( s )
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    return padSize * SPACE + s
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  \end{lstlisting}
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\pause
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What about \%3d?
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\end{frame}
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\begin{frame}[fragile]
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  {What does this function do?}
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  \begin{lstlisting}
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def what( n ):
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    if n < 0: n = -n
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    while n > 0:
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        if n % 2 == 1:
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            return False
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        n /= 10
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    return True
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  \end{lstlisting}
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\end{frame}
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\begin{frame}[fragile]
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  {What does this function do?}
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\begin{lstlisting}
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def what( n ):
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    i = 1    
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    while i * i < n:
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        i += 1
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    return i * i == n, i
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  \end{lstlisting}
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\end{frame}
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\begin{frame}[fragile]
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  {What does this function do?}
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  \begin{lstlisting}
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def what( n, x ):
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    z = 1.0
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    if n < 0:
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        x = 1.0 / x
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        n = -n
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    while n > 0:
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        if n % 2 == 1:
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            z *= x
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        n /= 2
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        x *= x
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    return z
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  \end{lstlisting}
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\end{frame}
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\begin{frame}
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  {Before writing a function}
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  \begin{itemize}
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      \item Builtin functions for various and sundry
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      \item \typ{abs, any, all, len, max, min}
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      \item \typ{pow, range, sum, type}
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      \item Refer here:
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          \url{http://docs.python.org/library/functions.html}
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  \end{itemize}
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  \inctime{10} 
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\end{frame}
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% TIME: 10 m, running 30m 
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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\begin{frame}{Problem set 2}
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  The focus is on writing functions and calling them.
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\end{frame}
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\begin{frame}{Problem 2.1}
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  Write a function to return the gcd of two numbers.
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\end{frame}
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\begin{frame}{Problem 2.2}
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A pythagorean triad $(a,b,c)$ has the property $a^2 + b^2 = c^2$.\\By primitive we mean triads that do not `depend' on others. For example, (4,3,5) is a variant of (3,4,5) and hence is not primitive. And (10,24,26) is easily derived from (5,12,13) and should not be displayed by our program. \\
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Write a program to print primitive pythagorean triads. The program should generate all triads with a, b values in the range 0---100
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\end{frame}
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\begin{frame}{Problem 2.3}
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  Write a program that generates a list of all four digit numbers that have all their digits even and are perfect squares.\\For example, the output should include 6400 but not 8100 (one digit is odd) or 4248 (not a perfect square).
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\end{frame}
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\begin{frame}{Problem 2.4}
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  The aliquot of a number is defined as: the sum of the \emph{proper} divisors of the number. For example, the aliquot(12) = 1 + 2 + 3 + 4 + 6 = 16.\\
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  Write a function that returns the aliquot number of a given number. 
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\end{frame}
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\begin{frame}{Problem 2.5}
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  A pair of numbers (a, b) is said to be \alert{amicable} if the aliquot number of a is b and the aliquot number of b is a.\\
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  Example: \texttt{220, 284}\\
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  Write a program that prints all five digit amicable pairs.
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  \inctime{25}
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\end{frame}
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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% TIME: 25 m, running 55m 
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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\subsection{Lists}
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\begin{frame}[fragile]
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  \frametitle{List creation and indexing}
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\begin{lstlisting}
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>>> a = [] # An empty list.
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>>> a = [1, 2, 3, 4] # More useful.
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>>> len(a) 
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4
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>>> a[0] + a[1] + a[2] + a[-1]
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10
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\end{lstlisting}
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  \begin{itemize}
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  \item Indices start with ?
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  \item Negative indices indicate ?
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  \end{itemize}
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\end{frame}
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\begin{frame}[fragile]
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  \frametitle{List: slices}
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  \begin{itemize}
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  \item Slicing is a basic operation
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  \item \typ{list[initial:final:step]}
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  \item  The step is optional
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  \end{itemize}
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\begin{lstlisting}
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>>> a[1:3] # A slice.
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[2, 3]
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>>> a[1:-1]
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[2, 3]
5
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>>> a[1:] == a[1:-1]
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False  
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\end{lstlisting}
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Explain last result
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\end{frame}
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\begin{frame}[fragile]
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  \frametitle{List: more slices}
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\begin{lstlisting}
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>>> a[0:-1:2] # Notice the step!
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[1, 3]
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>>> a[::2]
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[1, 3]
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>>> a[-1::-1]
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\end{lstlisting}
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What do you think the last one will do?
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  \emphbar{Note: Strings also use same indexing and slicing.}
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\end{frame}
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\begin{frame}[fragile]
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  \frametitle{List: examples}
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\begin{lstlisting}
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>>> a = [1, 2, 3, 4]
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>>> a[:2]
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[1, 2]
5
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>>> a[0:-1:2]
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[1, 3]
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\end{lstlisting}
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\pause
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\alert{Lists are mutable (unlike strings)}
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\begin{lstlisting}
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>>> a[1] = 20
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>>> a
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[1, 20, 3, 4]
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\end{lstlisting}
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\end{frame}
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\begin{frame}[fragile]
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  \frametitle{Lists are mutable and heterogenous}
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\begin{lstlisting}
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>>> a = ['spam', 'eggs', 100, 1234]
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>>> a[2] = a[2] + 23
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>>> a
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['spam', 'eggs', 123, 1234]
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>>> a[0:2] = [1, 12] # Replace items
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>>> a
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[1, 12, 123, 1234]
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>>> a[0:2] = [] # Remove items
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>>> a.append( 12345 )
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>>> a
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[123, 1234, 12345]
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\end{lstlisting}
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\inctime{10}
5
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\end{frame}
838cedef5e9d Added 4 tex slides for 4 sessions of Day 1 of the workshop.
Madhusudan.C.S <madhusudancs@gmail.com>
parents:
diff changeset
   364
21
844b81ad2a3c Added inctime to Day-1 Session 2 slides.
Madhusudan.C.S <madhusudancs@gmail.com>
parents: 18
diff changeset
   365
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
844b81ad2a3c Added inctime to Day-1 Session 2 slides.
Madhusudan.C.S <madhusudancs@gmail.com>
parents: 18
diff changeset
   366
% TIME: 10 m, running 65m 
844b81ad2a3c Added inctime to Day-1 Session 2 slides.
Madhusudan.C.S <madhusudancs@gmail.com>
parents: 18
diff changeset
   367
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
844b81ad2a3c Added inctime to Day-1 Session 2 slides.
Madhusudan.C.S <madhusudancs@gmail.com>
parents: 18
diff changeset
   368
5
838cedef5e9d Added 4 tex slides for 4 sessions of Day 1 of the workshop.
Madhusudan.C.S <madhusudancs@gmail.com>
parents:
diff changeset
   369
\begin{frame}[fragile]
838cedef5e9d Added 4 tex slides for 4 sessions of Day 1 of the workshop.
Madhusudan.C.S <madhusudancs@gmail.com>
parents:
diff changeset
   370
  \frametitle{List methods}
838cedef5e9d Added 4 tex slides for 4 sessions of Day 1 of the workshop.
Madhusudan.C.S <madhusudancs@gmail.com>
parents:
diff changeset
   371
\begin{lstlisting}
838cedef5e9d Added 4 tex slides for 4 sessions of Day 1 of the workshop.
Madhusudan.C.S <madhusudancs@gmail.com>
parents:
diff changeset
   372
>>> a = ['spam', 'eggs', 1, 12]
838cedef5e9d Added 4 tex slides for 4 sessions of Day 1 of the workshop.
Madhusudan.C.S <madhusudancs@gmail.com>
parents:
diff changeset
   373
>>> a.reverse() # in situ
838cedef5e9d Added 4 tex slides for 4 sessions of Day 1 of the workshop.
Madhusudan.C.S <madhusudancs@gmail.com>
parents:
diff changeset
   374
>>> a
838cedef5e9d Added 4 tex slides for 4 sessions of Day 1 of the workshop.
Madhusudan.C.S <madhusudancs@gmail.com>
parents:
diff changeset
   375
[12, 1, 'eggs', 'spam']
15
1bc961ae4ddd Completed reworking and refactoring on Session 2 for BPRIM.
Madhusudan.C.S <madhusudancs@gmail.com>
parents: 14
diff changeset
   376
>>> a.append(['x', 1])
5
838cedef5e9d Added 4 tex slides for 4 sessions of Day 1 of the workshop.
Madhusudan.C.S <madhusudancs@gmail.com>
parents:
diff changeset
   377
>>> a
838cedef5e9d Added 4 tex slides for 4 sessions of Day 1 of the workshop.
Madhusudan.C.S <madhusudancs@gmail.com>
parents:
diff changeset
   378
[12, 1, 'eggs', 'spam', ['x', 1]]
838cedef5e9d Added 4 tex slides for 4 sessions of Day 1 of the workshop.
Madhusudan.C.S <madhusudancs@gmail.com>
parents:
diff changeset
   379
>>> a.extend([1,2]) # Extend the list.
838cedef5e9d Added 4 tex slides for 4 sessions of Day 1 of the workshop.
Madhusudan.C.S <madhusudancs@gmail.com>
parents:
diff changeset
   380
>>> a.remove( 'spam' )
838cedef5e9d Added 4 tex slides for 4 sessions of Day 1 of the workshop.
Madhusudan.C.S <madhusudancs@gmail.com>
parents:
diff changeset
   381
>>> a
838cedef5e9d Added 4 tex slides for 4 sessions of Day 1 of the workshop.
Madhusudan.C.S <madhusudancs@gmail.com>
parents:
diff changeset
   382
[12, 1, 'eggs', ['x', 1], 1, 2]
838cedef5e9d Added 4 tex slides for 4 sessions of Day 1 of the workshop.
Madhusudan.C.S <madhusudancs@gmail.com>
parents:
diff changeset
   383
\end{lstlisting}
838cedef5e9d Added 4 tex slides for 4 sessions of Day 1 of the workshop.
Madhusudan.C.S <madhusudancs@gmail.com>
parents:
diff changeset
   384
\end{frame}
838cedef5e9d Added 4 tex slides for 4 sessions of Day 1 of the workshop.
Madhusudan.C.S <madhusudancs@gmail.com>
parents:
diff changeset
   385
838cedef5e9d Added 4 tex slides for 4 sessions of Day 1 of the workshop.
Madhusudan.C.S <madhusudancs@gmail.com>
parents:
diff changeset
   386
\begin{frame}[fragile]
838cedef5e9d Added 4 tex slides for 4 sessions of Day 1 of the workshop.
Madhusudan.C.S <madhusudancs@gmail.com>
parents:
diff changeset
   387
  \frametitle{List containership}
838cedef5e9d Added 4 tex slides for 4 sessions of Day 1 of the workshop.
Madhusudan.C.S <madhusudancs@gmail.com>
parents:
diff changeset
   388
  \begin{lstlisting}
838cedef5e9d Added 4 tex slides for 4 sessions of Day 1 of the workshop.
Madhusudan.C.S <madhusudancs@gmail.com>
parents:
diff changeset
   389
>>> a = ['cat', 'dog', 'rat', 'croc']
838cedef5e9d Added 4 tex slides for 4 sessions of Day 1 of the workshop.
Madhusudan.C.S <madhusudancs@gmail.com>
parents:
diff changeset
   390
>>> 'dog' in a
838cedef5e9d Added 4 tex slides for 4 sessions of Day 1 of the workshop.
Madhusudan.C.S <madhusudancs@gmail.com>
parents:
diff changeset
   391
True
838cedef5e9d Added 4 tex slides for 4 sessions of Day 1 of the workshop.
Madhusudan.C.S <madhusudancs@gmail.com>
parents:
diff changeset
   392
>>> 'snake' in a
838cedef5e9d Added 4 tex slides for 4 sessions of Day 1 of the workshop.
Madhusudan.C.S <madhusudancs@gmail.com>
parents:
diff changeset
   393
False
838cedef5e9d Added 4 tex slides for 4 sessions of Day 1 of the workshop.
Madhusudan.C.S <madhusudancs@gmail.com>
parents:
diff changeset
   394
>>> 'snake' not in a
838cedef5e9d Added 4 tex slides for 4 sessions of Day 1 of the workshop.
Madhusudan.C.S <madhusudancs@gmail.com>
parents:
diff changeset
   395
True
838cedef5e9d Added 4 tex slides for 4 sessions of Day 1 of the workshop.
Madhusudan.C.S <madhusudancs@gmail.com>
parents:
diff changeset
   396
>>> 'ell' in 'hello world'
838cedef5e9d Added 4 tex slides for 4 sessions of Day 1 of the workshop.
Madhusudan.C.S <madhusudancs@gmail.com>
parents:
diff changeset
   397
True
838cedef5e9d Added 4 tex slides for 4 sessions of Day 1 of the workshop.
Madhusudan.C.S <madhusudancs@gmail.com>
parents:
diff changeset
   398
  \end{lstlisting}
21
844b81ad2a3c Added inctime to Day-1 Session 2 slides.
Madhusudan.C.S <madhusudancs@gmail.com>
parents: 18
diff changeset
   399
  \inctime{5}
5
838cedef5e9d Added 4 tex slides for 4 sessions of Day 1 of the workshop.
Madhusudan.C.S <madhusudancs@gmail.com>
parents:
diff changeset
   400
\end{frame}
838cedef5e9d Added 4 tex slides for 4 sessions of Day 1 of the workshop.
Madhusudan.C.S <madhusudancs@gmail.com>
parents:
diff changeset
   401
21
844b81ad2a3c Added inctime to Day-1 Session 2 slides.
Madhusudan.C.S <madhusudancs@gmail.com>
parents: 18
diff changeset
   402
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
844b81ad2a3c Added inctime to Day-1 Session 2 slides.
Madhusudan.C.S <madhusudancs@gmail.com>
parents: 18
diff changeset
   403
% TIME: 5 m, running 70m 
844b81ad2a3c Added inctime to Day-1 Session 2 slides.
Madhusudan.C.S <madhusudancs@gmail.com>
parents: 18
diff changeset
   404
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
844b81ad2a3c Added inctime to Day-1 Session 2 slides.
Madhusudan.C.S <madhusudancs@gmail.com>
parents: 18
diff changeset
   405
5
838cedef5e9d Added 4 tex slides for 4 sessions of Day 1 of the workshop.
Madhusudan.C.S <madhusudancs@gmail.com>
parents:
diff changeset
   406
\begin{frame}[fragile]
838cedef5e9d Added 4 tex slides for 4 sessions of Day 1 of the workshop.
Madhusudan.C.S <madhusudancs@gmail.com>
parents:
diff changeset
   407
  \frametitle{Tuples: immutable}
838cedef5e9d Added 4 tex slides for 4 sessions of Day 1 of the workshop.
Madhusudan.C.S <madhusudancs@gmail.com>
parents:
diff changeset
   408
\begin{lstlisting}
838cedef5e9d Added 4 tex slides for 4 sessions of Day 1 of the workshop.
Madhusudan.C.S <madhusudancs@gmail.com>
parents:
diff changeset
   409
>>> t = (0, 1, 2)
838cedef5e9d Added 4 tex slides for 4 sessions of Day 1 of the workshop.
Madhusudan.C.S <madhusudancs@gmail.com>
parents:
diff changeset
   410
>>> print t[0], t[1], t[2], t[-1] 
838cedef5e9d Added 4 tex slides for 4 sessions of Day 1 of the workshop.
Madhusudan.C.S <madhusudancs@gmail.com>
parents:
diff changeset
   411
0 1 2 2
838cedef5e9d Added 4 tex slides for 4 sessions of Day 1 of the workshop.
Madhusudan.C.S <madhusudancs@gmail.com>
parents:
diff changeset
   412
>>> t[0] = 1
838cedef5e9d Added 4 tex slides for 4 sessions of Day 1 of the workshop.
Madhusudan.C.S <madhusudancs@gmail.com>
parents:
diff changeset
   413
Traceback (most recent call last):
838cedef5e9d Added 4 tex slides for 4 sessions of Day 1 of the workshop.
Madhusudan.C.S <madhusudancs@gmail.com>
parents:
diff changeset
   414
  File "<stdin>", line 1, in ?
15
1bc961ae4ddd Completed reworking and refactoring on Session 2 for BPRIM.
Madhusudan.C.S <madhusudancs@gmail.com>
parents: 14
diff changeset
   415
TypeError: object does not support item assignment
5
838cedef5e9d Added 4 tex slides for 4 sessions of Day 1 of the workshop.
Madhusudan.C.S <madhusudancs@gmail.com>
parents:
diff changeset
   416
\end{lstlisting}  
838cedef5e9d Added 4 tex slides for 4 sessions of Day 1 of the workshop.
Madhusudan.C.S <madhusudancs@gmail.com>
parents:
diff changeset
   417
\begin{itemize}
838cedef5e9d Added 4 tex slides for 4 sessions of Day 1 of the workshop.
Madhusudan.C.S <madhusudancs@gmail.com>
parents:
diff changeset
   418
    \item Multiple return values are actually a tuple.
838cedef5e9d Added 4 tex slides for 4 sessions of Day 1 of the workshop.
Madhusudan.C.S <madhusudancs@gmail.com>
parents:
diff changeset
   419
    \item Exchange is tuple (un)packing
838cedef5e9d Added 4 tex slides for 4 sessions of Day 1 of the workshop.
Madhusudan.C.S <madhusudancs@gmail.com>
parents:
diff changeset
   420
\end{itemize}
21
844b81ad2a3c Added inctime to Day-1 Session 2 slides.
Madhusudan.C.S <madhusudancs@gmail.com>
parents: 18
diff changeset
   421
\inctime{5}
844b81ad2a3c Added inctime to Day-1 Session 2 slides.
Madhusudan.C.S <madhusudancs@gmail.com>
parents: 18
diff changeset
   422
\end{frame}
5
838cedef5e9d Added 4 tex slides for 4 sessions of Day 1 of the workshop.
Madhusudan.C.S <madhusudancs@gmail.com>
parents:
diff changeset
   423
21
844b81ad2a3c Added inctime to Day-1 Session 2 slides.
Madhusudan.C.S <madhusudancs@gmail.com>
parents: 18
diff changeset
   424
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
844b81ad2a3c Added inctime to Day-1 Session 2 slides.
Madhusudan.C.S <madhusudancs@gmail.com>
parents: 18
diff changeset
   425
% TIME: 5 m, running 75m 
844b81ad2a3c Added inctime to Day-1 Session 2 slides.
Madhusudan.C.S <madhusudancs@gmail.com>
parents: 18
diff changeset
   426
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
5
838cedef5e9d Added 4 tex slides for 4 sessions of Day 1 of the workshop.
Madhusudan.C.S <madhusudancs@gmail.com>
parents:
diff changeset
   427
838cedef5e9d Added 4 tex slides for 4 sessions of Day 1 of the workshop.
Madhusudan.C.S <madhusudancs@gmail.com>
parents:
diff changeset
   428
\begin{frame}[fragile]
838cedef5e9d Added 4 tex slides for 4 sessions of Day 1 of the workshop.
Madhusudan.C.S <madhusudancs@gmail.com>
parents:
diff changeset
   429
  \frametitle{\typ{range()} function}
838cedef5e9d Added 4 tex slides for 4 sessions of Day 1 of the workshop.
Madhusudan.C.S <madhusudancs@gmail.com>
parents:
diff changeset
   430
  \begin{lstlisting}
838cedef5e9d Added 4 tex slides for 4 sessions of Day 1 of the workshop.
Madhusudan.C.S <madhusudancs@gmail.com>
parents:
diff changeset
   431
>>> range(7)
838cedef5e9d Added 4 tex slides for 4 sessions of Day 1 of the workshop.
Madhusudan.C.S <madhusudancs@gmail.com>
parents:
diff changeset
   432
[0, 1, 2, 3, 4, 5, 6]
838cedef5e9d Added 4 tex slides for 4 sessions of Day 1 of the workshop.
Madhusudan.C.S <madhusudancs@gmail.com>
parents:
diff changeset
   433
>>> range( 3, 9)
838cedef5e9d Added 4 tex slides for 4 sessions of Day 1 of the workshop.
Madhusudan.C.S <madhusudancs@gmail.com>
parents:
diff changeset
   434
[3, 4, 5, 6, 7, 8]
838cedef5e9d Added 4 tex slides for 4 sessions of Day 1 of the workshop.
Madhusudan.C.S <madhusudancs@gmail.com>
parents:
diff changeset
   435
>>> range( 4, 17, 3)
838cedef5e9d Added 4 tex slides for 4 sessions of Day 1 of the workshop.
Madhusudan.C.S <madhusudancs@gmail.com>
parents:
diff changeset
   436
[4, 7, 10, 13, 16]
838cedef5e9d Added 4 tex slides for 4 sessions of Day 1 of the workshop.
Madhusudan.C.S <madhusudancs@gmail.com>
parents:
diff changeset
   437
>>> range( 5, 1, -1)
838cedef5e9d Added 4 tex slides for 4 sessions of Day 1 of the workshop.
Madhusudan.C.S <madhusudancs@gmail.com>
parents:
diff changeset
   438
[5, 4, 3, 2]
838cedef5e9d Added 4 tex slides for 4 sessions of Day 1 of the workshop.
Madhusudan.C.S <madhusudancs@gmail.com>
parents:
diff changeset
   439
>>> range( 8, 12, -1)
838cedef5e9d Added 4 tex slides for 4 sessions of Day 1 of the workshop.
Madhusudan.C.S <madhusudancs@gmail.com>
parents:
diff changeset
   440
[]
838cedef5e9d Added 4 tex slides for 4 sessions of Day 1 of the workshop.
Madhusudan.C.S <madhusudancs@gmail.com>
parents:
diff changeset
   441
  \end{lstlisting}
838cedef5e9d Added 4 tex slides for 4 sessions of Day 1 of the workshop.
Madhusudan.C.S <madhusudancs@gmail.com>
parents:
diff changeset
   442
\end{frame}
838cedef5e9d Added 4 tex slides for 4 sessions of Day 1 of the workshop.
Madhusudan.C.S <madhusudancs@gmail.com>
parents:
diff changeset
   443
838cedef5e9d Added 4 tex slides for 4 sessions of Day 1 of the workshop.
Madhusudan.C.S <madhusudancs@gmail.com>
parents:
diff changeset
   444
\begin{frame}[fragile]
838cedef5e9d Added 4 tex slides for 4 sessions of Day 1 of the workshop.
Madhusudan.C.S <madhusudancs@gmail.com>
parents:
diff changeset
   445
  \frametitle{\typ{for\ldots range(\ldots)} idiom}
838cedef5e9d Added 4 tex slides for 4 sessions of Day 1 of the workshop.
Madhusudan.C.S <madhusudancs@gmail.com>
parents:
diff changeset
   446
  \begin{lstlisting}
838cedef5e9d Added 4 tex slides for 4 sessions of Day 1 of the workshop.
Madhusudan.C.S <madhusudancs@gmail.com>
parents:
diff changeset
   447
In [83]: for i in range(5):
838cedef5e9d Added 4 tex slides for 4 sessions of Day 1 of the workshop.
Madhusudan.C.S <madhusudancs@gmail.com>
parents:
diff changeset
   448
   ....:     print i, i * i
838cedef5e9d Added 4 tex slides for 4 sessions of Day 1 of the workshop.
Madhusudan.C.S <madhusudancs@gmail.com>
parents:
diff changeset
   449
   ....:     
838cedef5e9d Added 4 tex slides for 4 sessions of Day 1 of the workshop.
Madhusudan.C.S <madhusudancs@gmail.com>
parents:
diff changeset
   450
   ....:     
838cedef5e9d Added 4 tex slides for 4 sessions of Day 1 of the workshop.
Madhusudan.C.S <madhusudancs@gmail.com>
parents:
diff changeset
   451
0 0
838cedef5e9d Added 4 tex slides for 4 sessions of Day 1 of the workshop.
Madhusudan.C.S <madhusudancs@gmail.com>
parents:
diff changeset
   452
1 1
838cedef5e9d Added 4 tex slides for 4 sessions of Day 1 of the workshop.
Madhusudan.C.S <madhusudancs@gmail.com>
parents:
diff changeset
   453
2 4
838cedef5e9d Added 4 tex slides for 4 sessions of Day 1 of the workshop.
Madhusudan.C.S <madhusudancs@gmail.com>
parents:
diff changeset
   454
3 9
838cedef5e9d Added 4 tex slides for 4 sessions of Day 1 of the workshop.
Madhusudan.C.S <madhusudancs@gmail.com>
parents:
diff changeset
   455
4 16
838cedef5e9d Added 4 tex slides for 4 sessions of Day 1 of the workshop.
Madhusudan.C.S <madhusudancs@gmail.com>
parents:
diff changeset
   456
\end{lstlisting}
838cedef5e9d Added 4 tex slides for 4 sessions of Day 1 of the workshop.
Madhusudan.C.S <madhusudancs@gmail.com>
parents:
diff changeset
   457
\end{frame}
838cedef5e9d Added 4 tex slides for 4 sessions of Day 1 of the workshop.
Madhusudan.C.S <madhusudancs@gmail.com>
parents:
diff changeset
   458
838cedef5e9d Added 4 tex slides for 4 sessions of Day 1 of the workshop.
Madhusudan.C.S <madhusudancs@gmail.com>
parents:
diff changeset
   459
\begin{frame}[fragile]
838cedef5e9d Added 4 tex slides for 4 sessions of Day 1 of the workshop.
Madhusudan.C.S <madhusudancs@gmail.com>
parents:
diff changeset
   460
  \frametitle{\typ{for}: the list companion}
838cedef5e9d Added 4 tex slides for 4 sessions of Day 1 of the workshop.
Madhusudan.C.S <madhusudancs@gmail.com>
parents:
diff changeset
   461
  
838cedef5e9d Added 4 tex slides for 4 sessions of Day 1 of the workshop.
Madhusudan.C.S <madhusudancs@gmail.com>
parents:
diff changeset
   462
  \begin{lstlisting}
838cedef5e9d Added 4 tex slides for 4 sessions of Day 1 of the workshop.
Madhusudan.C.S <madhusudancs@gmail.com>
parents:
diff changeset
   463
In [84]: a = ['a', 'b', 'c']
838cedef5e9d Added 4 tex slides for 4 sessions of Day 1 of the workshop.
Madhusudan.C.S <madhusudancs@gmail.com>
parents:
diff changeset
   464
In [85]: for x in a:
838cedef5e9d Added 4 tex slides for 4 sessions of Day 1 of the workshop.
Madhusudan.C.S <madhusudancs@gmail.com>
parents:
diff changeset
   465
   ....:    print x, chr( ord(x) + 10 )
838cedef5e9d Added 4 tex slides for 4 sessions of Day 1 of the workshop.
Madhusudan.C.S <madhusudancs@gmail.com>
parents:
diff changeset
   466
   ....:
838cedef5e9d Added 4 tex slides for 4 sessions of Day 1 of the workshop.
Madhusudan.C.S <madhusudancs@gmail.com>
parents:
diff changeset
   467
a  k
838cedef5e9d Added 4 tex slides for 4 sessions of Day 1 of the workshop.
Madhusudan.C.S <madhusudancs@gmail.com>
parents:
diff changeset
   468
b  l
838cedef5e9d Added 4 tex slides for 4 sessions of Day 1 of the workshop.
Madhusudan.C.S <madhusudancs@gmail.com>
parents:
diff changeset
   469
c  m
838cedef5e9d Added 4 tex slides for 4 sessions of Day 1 of the workshop.
Madhusudan.C.S <madhusudancs@gmail.com>
parents:
diff changeset
   470
  \end{lstlisting}
838cedef5e9d Added 4 tex slides for 4 sessions of Day 1 of the workshop.
Madhusudan.C.S <madhusudancs@gmail.com>
parents:
diff changeset
   471
  Iterating over the list and not the index + reference\\
838cedef5e9d Added 4 tex slides for 4 sessions of Day 1 of the workshop.
Madhusudan.C.S <madhusudancs@gmail.com>
parents:
diff changeset
   472
  what if you want the index?
838cedef5e9d Added 4 tex slides for 4 sessions of Day 1 of the workshop.
Madhusudan.C.S <madhusudancs@gmail.com>
parents:
diff changeset
   473
\end{frame}
838cedef5e9d Added 4 tex slides for 4 sessions of Day 1 of the workshop.
Madhusudan.C.S <madhusudancs@gmail.com>
parents:
diff changeset
   474
838cedef5e9d Added 4 tex slides for 4 sessions of Day 1 of the workshop.
Madhusudan.C.S <madhusudancs@gmail.com>
parents:
diff changeset
   475
\begin{frame}[fragile]
838cedef5e9d Added 4 tex slides for 4 sessions of Day 1 of the workshop.
Madhusudan.C.S <madhusudancs@gmail.com>
parents:
diff changeset
   476
  \frametitle{\typ{for}: the list companion}
838cedef5e9d Added 4 tex slides for 4 sessions of Day 1 of the workshop.
Madhusudan.C.S <madhusudancs@gmail.com>
parents:
diff changeset
   477
  \begin{lstlisting}
838cedef5e9d Added 4 tex slides for 4 sessions of Day 1 of the workshop.
Madhusudan.C.S <madhusudancs@gmail.com>
parents:
diff changeset
   478
In [89]: for p, ch in enumerate( a ):
838cedef5e9d Added 4 tex slides for 4 sessions of Day 1 of the workshop.
Madhusudan.C.S <madhusudancs@gmail.com>
parents:
diff changeset
   479
   ....:     print p, ch
838cedef5e9d Added 4 tex slides for 4 sessions of Day 1 of the workshop.
Madhusudan.C.S <madhusudancs@gmail.com>
parents:
diff changeset
   480
   ....:     
838cedef5e9d Added 4 tex slides for 4 sessions of Day 1 of the workshop.
Madhusudan.C.S <madhusudancs@gmail.com>
parents:
diff changeset
   481
   ....:     
838cedef5e9d Added 4 tex slides for 4 sessions of Day 1 of the workshop.
Madhusudan.C.S <madhusudancs@gmail.com>
parents:
diff changeset
   482
0 a
838cedef5e9d Added 4 tex slides for 4 sessions of Day 1 of the workshop.
Madhusudan.C.S <madhusudancs@gmail.com>
parents:
diff changeset
   483
1 b
838cedef5e9d Added 4 tex slides for 4 sessions of Day 1 of the workshop.
Madhusudan.C.S <madhusudancs@gmail.com>
parents:
diff changeset
   484
2 c
838cedef5e9d Added 4 tex slides for 4 sessions of Day 1 of the workshop.
Madhusudan.C.S <madhusudancs@gmail.com>
parents:
diff changeset
   485
  \end{lstlisting}
838cedef5e9d Added 4 tex slides for 4 sessions of Day 1 of the workshop.
Madhusudan.C.S <madhusudancs@gmail.com>
parents:
diff changeset
   486
Try: \typ{print enumerate(a)}
21
844b81ad2a3c Added inctime to Day-1 Session 2 slides.
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   487
\inctime{10}
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838cedef5e9d Added 4 tex slides for 4 sessions of Day 1 of the workshop.
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   488
\end{frame}
838cedef5e9d Added 4 tex slides for 4 sessions of Day 1 of the workshop.
Madhusudan.C.S <madhusudancs@gmail.com>
parents:
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   489
838cedef5e9d Added 4 tex slides for 4 sessions of Day 1 of the workshop.
Madhusudan.C.S <madhusudancs@gmail.com>
parents:
diff changeset
   490
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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844b81ad2a3c Added inctime to Day-1 Session 2 slides.
Madhusudan.C.S <madhusudancs@gmail.com>
parents: 18
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   491
% TIME: 10 m, running 85m 
5
838cedef5e9d Added 4 tex slides for 4 sessions of Day 1 of the workshop.
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parents:
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   492
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
838cedef5e9d Added 4 tex slides for 4 sessions of Day 1 of the workshop.
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parents:
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   493
838cedef5e9d Added 4 tex slides for 4 sessions of Day 1 of the workshop.
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parents:
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   494
\begin{frame}
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2adb90f9e287 Added what did we learn to all slides and reworked on Session 2 and 4.
Madhusudan.C.S <madhusudancs@gmail.com>
parents: 46
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   495
  \frametitle{What did we learn?}
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838cedef5e9d Added 4 tex slides for 4 sessions of Day 1 of the workshop.
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   496
  \tableofcontents
838cedef5e9d Added 4 tex slides for 4 sessions of Day 1 of the workshop.
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   497
  % You might wish to add the option [pausesections]
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1bc961ae4ddd Completed reworking and refactoring on Session 2 for BPRIM.
Madhusudan.C.S <madhusudancs@gmail.com>
parents: 14
diff changeset
   498
\end{frame}
5
838cedef5e9d Added 4 tex slides for 4 sessions of Day 1 of the workshop.
Madhusudan.C.S <madhusudancs@gmail.com>
parents:
diff changeset
   499
838cedef5e9d Added 4 tex slides for 4 sessions of Day 1 of the workshop.
Madhusudan.C.S <madhusudancs@gmail.com>
parents:
diff changeset
   500
\end{document}