day2/session2.tex
author Santosh G. Vattam <vattam.santosh@gmail.com>
Thu, 11 Mar 2010 18:01:23 +0530
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permissions -rw-r--r--
Updated after Day 2 at GRDCS
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%Tutorial slides on Python.
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%
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% Author: FOSSEE 
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% Copyright (c) 2009, FOSSEE, IIT Bombay
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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{infolines}
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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]{\lstinline{#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 language: Data structures and functions}
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\author[FOSSEE Team] {The FOSSEE Group}
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\institute[IIT Bombay] {Department of Aerospace Engineering\\IIT Bombay}
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\date[] {09 March, 2010\\Day 2, 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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\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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% 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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\begin{frame}
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  \frametitle{Outline}
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  \tableofcontents
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  % You might wish to add the option [pausesections]
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\end{frame}
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\section{Control flow}
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\subsection{Basic Looping}
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\begin{frame}[fragile]
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  \frametitle{\typ{while}}
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\begin{block}{Example: Fibonacci series}
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  Sum of previous two elements defines the next
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\end{block}
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  \begin{lstlisting}
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In []: a, b = 0, 1
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In []: while b < 10:
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  ...:     print b,
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  ...:     a, b = b, a + b
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  ...:
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  ...:
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\end{lstlisting}
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\typ{1 1 2 3 5 8}\\
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\end{frame}
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\begin{frame}[fragile]
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\frametitle{\typ{range()}}
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\kwrd{range([start,] stop[, step])}\\
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\begin{itemize}
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  \item \typ{range()} returns a list of integers
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  \item The \typ{start} and the \typ{step} arguments are optional
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  \item \typ{stop} is not included in the list
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\end{itemize}
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\vspace*{.5in}
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\begin{block}{Documentation convention}
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  \begin{itemize}
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    \item \alert{Anything within \typ{[]} is optional}
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    \item Nothing to do with Python.
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  \end{itemize}
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\end{block}
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\end{frame}
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\begin{frame}[fragile]
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  \frametitle{\texttt{for} \ldots \typ{range()}}
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Example: print squares of first \typ{5} numbers
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  \begin{lstlisting}
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In []: for i in range(5):
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 ....:     print i, i * i
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 ....:
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 ....:
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0 0
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1 1
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2 4
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3 9
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4 16
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\end{lstlisting}
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\end{frame}
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\begin{frame}[fragile]
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  \frametitle{\texttt{for} \ldots \typ{range()}}
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Example: print squares of odd numbers from 3 to 9
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  \begin{lstlisting}
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In []: for i in range(3, 10, 2):
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 ....:     print i, i * i
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 ....:
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 ....:
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3 9
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5 25
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7 49
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9 81
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\end{lstlisting}
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\inctime{5}
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\end{frame}
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\subsection{Exercises}
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\begin{frame}{Problem set 1: 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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\vspace*{0.2in}
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\emphbar{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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\inctime{5}
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\end{frame}
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228
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\section{Data structures}
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\subsection{Lists}
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\begin{frame}[fragile]
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  \frametitle{Lists}
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\begin{block}{We already know that}
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  \begin{lstlisting}
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num = [1, 2, 3, 4]
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  \end{lstlisting}
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is a list
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\end{block}
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\end{frame}
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\begin{frame}[fragile]
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  \frametitle{Lists: methods}
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  \begin{lstlisting}
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In []: num = [9, 8, 2, 3, 7]
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In []: num + [4, 5, 6]
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Out[]: [9, 8, 2, 3, 7, 4, 5, 6]
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In []: num.append([4, 5, 6])
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In []: num
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Out[]: [9, 8, 2, 3, 7, [4, 5, 6]]
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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: methods}
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  \begin{lstlisting}
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In []: num = [9, 8, 2, 3, 7]
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In []: num.extend([4, 5, 6])
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In []: num
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Out[]: [9, 8, 2, 3, 7, 4, 5, 6]
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In []: num.reverse()
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In []: num
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Out[]: [6, 5, 4, 7, 3, 2, 8, 9]
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In []: num.remove(6)
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In []: num
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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: slicing}
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  \begin{itemize}
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    \item \typ{list[initial:final]}
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  \end{itemize}
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\begin{lstlisting}
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In []: a = [1, 2, 3, 4, 5]
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In []: a[1:3]
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Out[]: [2, 3]
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In []: a[1:-1]
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Out[]: [2, 3, 4]
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In []: a[:3]
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Out[]: [1, 2, 3]
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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: slicing}
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  \begin{itemize}
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    \item \typ{list[initial:final:step]}
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  \end{itemize}
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\begin{lstlisting}
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In []: a[1:-1:2]
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Out[]: [2, 4]
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In []: a[::2]
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Out[]: [1, 3, 5]
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In []: a[-1::-1]
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Out[]: [5, 4, 3, 2, 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{List containership}
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\emphbar{Recall \typ{num} is \typ{[9, 8, 2, 3, 7]}}
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\begin{lstlisting}
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In []: 4 in num
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Out[]: False
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In []: b = 8
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In []: b in num
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Out[]: True
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In []: b not in num
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Out[]: False
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\end{lstlisting}
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\end{frame}
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\subsection{Tuples}
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\begin{frame}[fragile]
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\frametitle{Tuples: Immutable lists}
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\begin{lstlisting}
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In []: t = (1, 2, 3, 4, 5, 6, 7, 8)
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In []: t[0] + t[3] + t[-1]
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Out[]: 13
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In []: t[4] = 7 
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\end{lstlisting}
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\pause
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\begin{block}{Note:}
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\begin{itemize}
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  \item Tuples are immutable - cannot be changed
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\end{itemize}
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\end{block}
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  \inctime{10}
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\end{frame}
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\begin{frame}
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  {A classic problem}
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  \begin{block}
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    {Interchange values}
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    How to interchange values of two variables? 
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  \end{block}
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  \pause
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  \begin{block}{Note:}
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    This Python idiom works for all types of variables.\\
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They need not be of the same type!
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  \end{block}
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\end{frame}
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\subsection{Dictionaries}
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\begin{frame}[fragile]
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  \frametitle{Dictionaries: recall}
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  \begin{lstlisting}
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In []: player = {'Mat': 134,'Inn': 233,
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          'Runs': 10823, 'Avg': 52.53}
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In []: player['Avg']
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Out[]: 52.530000000000001
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  \end{lstlisting}
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  \begin{block}{Note!}
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    Duplicate keys $\Rightarrow$ overwritten!\\
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    You can iterate through a dictionary using keys.
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  \end{block}
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\end{frame}
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\begin{frame}[fragile]
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  \frametitle{Dictionaries: containership}
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  \begin{lstlisting}
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In []: 'Inn' in player
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Out[]: True
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In []: 'Econ' in player
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Out[]: False
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  \end{lstlisting}
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  \begin{block}{Note}
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    \begin{itemize}
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      \item We can check for the containership of keys only
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      \item Not values
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    \end{itemize}
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  \end{block}
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\end{frame}
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\begin{frame}[fragile]
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  \frametitle{Dictionaries: methods}
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  \begin{lstlisting}
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In []: player.keys()
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Out[]: ['Runs', 'Inn', 'Avg', 'Mat']
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In []: player.values()
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Out[]: [10823, 233, 
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        52.530000000000001, 134]
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  \end{lstlisting}
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\end{frame}
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\begin{frame} {Problem Set 2.1: Problem 2.1.1}
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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 program that takes such a string as input and prints a tuple (yyyy, mm, dd) where all three elements are ints.
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\end{frame}
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\subsection{Sets}
228
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\begin{frame}[fragile]
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  \frametitle{Sets}
228
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   394
    \begin{itemize}
238f3010c981 Created and made first cut slides for session 2 day 2.
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parents:
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   395
      \item Simplest container, mutable
238f3010c981 Created and made first cut slides for session 2 day 2.
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parents:
diff changeset
   396
      \item No ordering, no duplicates
238f3010c981 Created and made first cut slides for session 2 day 2.
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diff changeset
   397
      \item usual suspects: union, intersection, subset \ldots
238f3010c981 Created and made first cut slides for session 2 day 2.
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parents:
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   398
      \item >, >=, <, <=, in, \ldots
238f3010c981 Created and made first cut slides for session 2 day 2.
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parents:
diff changeset
   399
    \end{itemize}
238f3010c981 Created and made first cut slides for session 2 day 2.
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    \begin{lstlisting}
288
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   402
In []: f10 = set([1,2,3,5,8])
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   403
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   404
In []: p10 = set([2,3,5,7])
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diff changeset
   405
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   406
In []: f10 | p10
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   407
Out[]: set([1, 2, 3, 5, 7, 8])
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   408
\end{lstlisting}
238f3010c981 Created and made first cut slides for session 2 day 2.
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parents:
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\end{frame}
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   410
238f3010c981 Created and made first cut slides for session 2 day 2.
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\begin{frame}[fragile]
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  \frametitle{Set \ldots}
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    \begin{lstlisting}
288
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   414
In []: f10 & p10
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   415
Out[]: set([2, 3, 5])
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   416
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   417
In []: f10 - p10
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   418
Out[]: set([1, 8])
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diff changeset
   419
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   420
In []: p10 - f10, f10 ^ p10
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   421
Out[]: (set([7]), set([1, 7, 8]))
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diff changeset
   422
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   423
In []: set([2,3]) < p10
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   424
Out[]: True
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   425
\end{lstlisting}
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\end{frame}
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   427
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   428
\begin{frame}[fragile]
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  \frametitle{Set \ldots}
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   430
    \begin{lstlisting}
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   431
In []: set([2,3]) <= p10
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   432
Out[]: True
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diff changeset
   433
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diff changeset
   434
In []: 2 in p10
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   435
Out[]: True
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diff changeset
   436
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diff changeset
   437
In []: 4 in p10
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diff changeset
   438
Out[]: False
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diff changeset
   439
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diff changeset
   440
In []: len(f10)
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diff changeset
   441
Out[]: 5
228
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parents:
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   442
\end{lstlisting}
238f3010c981 Created and made first cut slides for session 2 day 2.
Madhusudan.C.S <madhusudancs@gmail.com>
parents:
diff changeset
   443
\end{frame}
238f3010c981 Created and made first cut slides for session 2 day 2.
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parents:
diff changeset
   444
238f3010c981 Created and made first cut slides for session 2 day 2.
Madhusudan.C.S <madhusudancs@gmail.com>
parents:
diff changeset
   445
\begin{frame}
297
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parents: 288
diff changeset
   446
  \frametitle{Problem set 2.2: Problem 2.2.1}
a835affb1447 Added final changes to all day 2 slides for Calicut workshop.
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parents: 288
diff changeset
   447
Given a dictionary of the names of students and their marks, identify how many duplicate marks are there? and what are these?
288
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   448
\end{frame}
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   449
c4e25269a86c Reorganized slides.
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diff changeset
   450
\begin{frame}
297
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   451
  \frametitle{Problem 2.2.2}
a835affb1447 Added final changes to all day 2 slides for Calicut workshop.
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parents: 288
diff changeset
   452
Given a list of words, find all the anagrams in the list.
a835affb1447 Added final changes to all day 2 slides for Calicut workshop.
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parents: 288
diff changeset
   453
228
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parents:
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   454
\end{frame}
238f3010c981 Created and made first cut slides for session 2 day 2.
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parents:
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   455
238f3010c981 Created and made first cut slides for session 2 day 2.
Madhusudan.C.S <madhusudancs@gmail.com>
parents:
diff changeset
   456
\section{Functions}
238f3010c981 Created and made first cut slides for session 2 day 2.
Madhusudan.C.S <madhusudancs@gmail.com>
parents:
diff changeset
   457
\begin{frame}[fragile]
238f3010c981 Created and made first cut slides for session 2 day 2.
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parents:
diff changeset
   458
  \frametitle{Functions}
238f3010c981 Created and made first cut slides for session 2 day 2.
Madhusudan.C.S <madhusudancs@gmail.com>
parents:
diff changeset
   459
  \begin{itemize}
238f3010c981 Created and made first cut slides for session 2 day 2.
Madhusudan.C.S <madhusudancs@gmail.com>
parents:
diff changeset
   460
    \item \kwrd{def} - keyword to define a function
238f3010c981 Created and made first cut slides for session 2 day 2.
Madhusudan.C.S <madhusudancs@gmail.com>
parents:
diff changeset
   461
    \item Arguments are local to a function
238f3010c981 Created and made first cut slides for session 2 day 2.
Madhusudan.C.S <madhusudancs@gmail.com>
parents:
diff changeset
   462
    \item Functions can return multiple values
238f3010c981 Created and made first cut slides for session 2 day 2.
Madhusudan.C.S <madhusudancs@gmail.com>
parents:
diff changeset
   463
  \end{itemize}
238f3010c981 Created and made first cut slides for session 2 day 2.
Madhusudan.C.S <madhusudancs@gmail.com>
parents:
diff changeset
   464
\end{frame}
238f3010c981 Created and made first cut slides for session 2 day 2.
Madhusudan.C.S <madhusudancs@gmail.com>
parents:
diff changeset
   465
238f3010c981 Created and made first cut slides for session 2 day 2.
Madhusudan.C.S <madhusudancs@gmail.com>
parents:
diff changeset
   466
\begin{frame}[fragile]
238f3010c981 Created and made first cut slides for session 2 day 2.
Madhusudan.C.S <madhusudancs@gmail.com>
parents:
diff changeset
   467
  \frametitle{Functions: example}
238f3010c981 Created and made first cut slides for session 2 day 2.
Madhusudan.C.S <madhusudancs@gmail.com>
parents:
diff changeset
   468
  \begin{lstlisting}
238f3010c981 Created and made first cut slides for session 2 day 2.
Madhusudan.C.S <madhusudancs@gmail.com>
parents:
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   469
def signum( r ):
238f3010c981 Created and made first cut slides for session 2 day 2.
Madhusudan.C.S <madhusudancs@gmail.com>
parents:
diff changeset
   470
    """returns 0 if r is zero
238f3010c981 Created and made first cut slides for session 2 day 2.
Madhusudan.C.S <madhusudancs@gmail.com>
parents:
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   471
    -1 if r is negative
238f3010c981 Created and made first cut slides for session 2 day 2.
Madhusudan.C.S <madhusudancs@gmail.com>
parents:
diff changeset
   472
    +1 if r is positive"""
238f3010c981 Created and made first cut slides for session 2 day 2.
Madhusudan.C.S <madhusudancs@gmail.com>
parents:
diff changeset
   473
    if r < 0:
238f3010c981 Created and made first cut slides for session 2 day 2.
Madhusudan.C.S <madhusudancs@gmail.com>
parents:
diff changeset
   474
        return -1
238f3010c981 Created and made first cut slides for session 2 day 2.
Madhusudan.C.S <madhusudancs@gmail.com>
parents:
diff changeset
   475
    elif r > 0:
238f3010c981 Created and made first cut slides for session 2 day 2.
Madhusudan.C.S <madhusudancs@gmail.com>
parents:
diff changeset
   476
        return 1
238f3010c981 Created and made first cut slides for session 2 day 2.
Madhusudan.C.S <madhusudancs@gmail.com>
parents:
diff changeset
   477
    else:
238f3010c981 Created and made first cut slides for session 2 day 2.
Madhusudan.C.S <madhusudancs@gmail.com>
parents:
diff changeset
   478
        return 0
238f3010c981 Created and made first cut slides for session 2 day 2.
Madhusudan.C.S <madhusudancs@gmail.com>
parents:
diff changeset
   479
  \end{lstlisting}
297
a835affb1447 Added final changes to all day 2 slides for Calicut workshop.
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parents: 288
diff changeset
   480
  \emphbar{Note docstrings}
228
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parents:
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   481
\end{frame}
238f3010c981 Created and made first cut slides for session 2 day 2.
Madhusudan.C.S <madhusudancs@gmail.com>
parents:
diff changeset
   482
238f3010c981 Created and made first cut slides for session 2 day 2.
Madhusudan.C.S <madhusudancs@gmail.com>
parents:
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   483
\begin{frame}[fragile]
288
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parents: 251
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   484
  \frametitle {What does this function do?}
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parents: 251
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   485
  \begin{lstlisting}
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diff changeset
   486
def what( n ):
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diff changeset
   487
    if n < 0: n = -n
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diff changeset
   488
    while n > 0:
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   489
        if n % 2 == 1:
c4e25269a86c Reorganized slides.
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diff changeset
   490
            return False
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parents: 251
diff changeset
   491
        n /= 10
c4e25269a86c Reorganized slides.
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diff changeset
   492
    return True
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   493
  \end{lstlisting}
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   494
\end{frame} 
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   495
c4e25269a86c Reorganized slides.
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   496
\begin{frame}[fragile]
228
238f3010c981 Created and made first cut slides for session 2 day 2.
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parents:
diff changeset
   497
  {What does this function do?}
238f3010c981 Created and made first cut slides for session 2 day 2.
Madhusudan.C.S <madhusudancs@gmail.com>
parents:
diff changeset
   498
\begin{lstlisting}
238f3010c981 Created and made first cut slides for session 2 day 2.
Madhusudan.C.S <madhusudancs@gmail.com>
parents:
diff changeset
   499
def what( n ):
238f3010c981 Created and made first cut slides for session 2 day 2.
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parents:
diff changeset
   500
    i = 1
238f3010c981 Created and made first cut slides for session 2 day 2.
Madhusudan.C.S <madhusudancs@gmail.com>
parents:
diff changeset
   501
    while i * i < n:
238f3010c981 Created and made first cut slides for session 2 day 2.
Madhusudan.C.S <madhusudancs@gmail.com>
parents:
diff changeset
   502
        i += 1
238f3010c981 Created and made first cut slides for session 2 day 2.
Madhusudan.C.S <madhusudancs@gmail.com>
parents:
diff changeset
   503
    return i * i == n, i
238f3010c981 Created and made first cut slides for session 2 day 2.
Madhusudan.C.S <madhusudancs@gmail.com>
parents:
diff changeset
   504
  \end{lstlisting}
238f3010c981 Created and made first cut slides for session 2 day 2.
Madhusudan.C.S <madhusudancs@gmail.com>
parents:
diff changeset
   505
\end{frame}
238f3010c981 Created and made first cut slides for session 2 day 2.
Madhusudan.C.S <madhusudancs@gmail.com>
parents:
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   506
373
f04eca8b2f3d Commits from NIT DGP and IITK
Santosh G. Vattam <vattam.santosh@gmail.com>
parents: 344
diff changeset
   507
\begin{frame}[fragile]
f04eca8b2f3d Commits from NIT DGP and IITK
Santosh G. Vattam <vattam.santosh@gmail.com>
parents: 344
diff changeset
   508
  \frametitle {What does this function do?}
f04eca8b2f3d Commits from NIT DGP and IITK
Santosh G. Vattam <vattam.santosh@gmail.com>
parents: 344
diff changeset
   509
  \begin{lstlisting}
f04eca8b2f3d Commits from NIT DGP and IITK
Santosh G. Vattam <vattam.santosh@gmail.com>
parents: 344
diff changeset
   510
def what( x, n ):
f04eca8b2f3d Commits from NIT DGP and IITK
Santosh G. Vattam <vattam.santosh@gmail.com>
parents: 344
diff changeset
   511
    if n < 0: 
f04eca8b2f3d Commits from NIT DGP and IITK
Santosh G. Vattam <vattam.santosh@gmail.com>
parents: 344
diff changeset
   512
       n = -n
f04eca8b2f3d Commits from NIT DGP and IITK
Santosh G. Vattam <vattam.santosh@gmail.com>
parents: 344
diff changeset
   513
       x = 1.0 / x
f04eca8b2f3d Commits from NIT DGP and IITK
Santosh G. Vattam <vattam.santosh@gmail.com>
parents: 344
diff changeset
   514
f04eca8b2f3d Commits from NIT DGP and IITK
Santosh G. Vattam <vattam.santosh@gmail.com>
parents: 344
diff changeset
   515
    z = 1.0
f04eca8b2f3d Commits from NIT DGP and IITK
Santosh G. Vattam <vattam.santosh@gmail.com>
parents: 344
diff changeset
   516
    while n > 0:
f04eca8b2f3d Commits from NIT DGP and IITK
Santosh G. Vattam <vattam.santosh@gmail.com>
parents: 344
diff changeset
   517
        if n % 2 == 1:
f04eca8b2f3d Commits from NIT DGP and IITK
Santosh G. Vattam <vattam.santosh@gmail.com>
parents: 344
diff changeset
   518
            z *= x
f04eca8b2f3d Commits from NIT DGP and IITK
Santosh G. Vattam <vattam.santosh@gmail.com>
parents: 344
diff changeset
   519
        x *= x
f04eca8b2f3d Commits from NIT DGP and IITK
Santosh G. Vattam <vattam.santosh@gmail.com>
parents: 344
diff changeset
   520
        n /= 2
f04eca8b2f3d Commits from NIT DGP and IITK
Santosh G. Vattam <vattam.santosh@gmail.com>
parents: 344
diff changeset
   521
    return z
f04eca8b2f3d Commits from NIT DGP and IITK
Santosh G. Vattam <vattam.santosh@gmail.com>
parents: 344
diff changeset
   522
  \end{lstlisting}
f04eca8b2f3d Commits from NIT DGP and IITK
Santosh G. Vattam <vattam.santosh@gmail.com>
parents: 344
diff changeset
   523
\end{frame} 
f04eca8b2f3d Commits from NIT DGP and IITK
Santosh G. Vattam <vattam.santosh@gmail.com>
parents: 344
diff changeset
   524
228
238f3010c981 Created and made first cut slides for session 2 day 2.
Madhusudan.C.S <madhusudancs@gmail.com>
parents:
diff changeset
   525
\begin{frame}
288
c4e25269a86c Reorganized slides.
Madhusudan.C.S <madhusudancs@gmail.com>
parents: 251
diff changeset
   526
  \frametitle{What did we learn?}
228
238f3010c981 Created and made first cut slides for session 2 day 2.
Madhusudan.C.S <madhusudancs@gmail.com>
parents:
diff changeset
   527
  \begin{itemize}
288
c4e25269a86c Reorganized slides.
Madhusudan.C.S <madhusudancs@gmail.com>
parents: 251
diff changeset
   528
    \item Loops: \kwrd{while}, \kwrd{for}
297
a835affb1447 Added final changes to all day 2 slides for Calicut workshop.
Madhusudan.C.S <madhusudancs@gmail.com>
parents: 288
diff changeset
   529
    \item Advanced Data structures:
a835affb1447 Added final changes to all day 2 slides for Calicut workshop.
Madhusudan.C.S <madhusudancs@gmail.com>
parents: 288
diff changeset
   530
    \begin{itemize}
a835affb1447 Added final changes to all day 2 slides for Calicut workshop.
Madhusudan.C.S <madhusudancs@gmail.com>
parents: 288
diff changeset
   531
      \item Lists
a835affb1447 Added final changes to all day 2 slides for Calicut workshop.
Madhusudan.C.S <madhusudancs@gmail.com>
parents: 288
diff changeset
   532
      \item Tuples
a835affb1447 Added final changes to all day 2 slides for Calicut workshop.
Madhusudan.C.S <madhusudancs@gmail.com>
parents: 288
diff changeset
   533
      \item Dictionaries
a835affb1447 Added final changes to all day 2 slides for Calicut workshop.
Madhusudan.C.S <madhusudancs@gmail.com>
parents: 288
diff changeset
   534
      \item Sets
a835affb1447 Added final changes to all day 2 slides for Calicut workshop.
Madhusudan.C.S <madhusudancs@gmail.com>
parents: 288
diff changeset
   535
    \end{itemize}
288
c4e25269a86c Reorganized slides.
Madhusudan.C.S <madhusudancs@gmail.com>
parents: 251
diff changeset
   536
    \item Functions
297
a835affb1447 Added final changes to all day 2 slides for Calicut workshop.
Madhusudan.C.S <madhusudancs@gmail.com>
parents: 288
diff changeset
   537
    \item Docstrings
228
238f3010c981 Created and made first cut slides for session 2 day 2.
Madhusudan.C.S <madhusudancs@gmail.com>
parents:
diff changeset
   538
  \end{itemize}
238f3010c981 Created and made first cut slides for session 2 day 2.
Madhusudan.C.S <madhusudancs@gmail.com>
parents:
diff changeset
   539
\end{frame}
238f3010c981 Created and made first cut slides for session 2 day 2.
Madhusudan.C.S <madhusudancs@gmail.com>
parents:
diff changeset
   540
330
46533051b9d3 commited changes made for scipy and cheatsheats.
Shantanu <shantanu@fossee.in>
parents: 297
diff changeset
   541
\end{document}
344
19754ed6050f Moved all day2 quiz questions to end of day2-sessions.
Puneeth Chaganti <punchagan@fossee.in>
parents: 339
diff changeset
   542
19754ed6050f Moved all day2 quiz questions to end of day2-sessions.
Puneeth Chaganti <punchagan@fossee.in>
parents: 339
diff changeset
   543
%% Questions for Quiz %%
19754ed6050f Moved all day2 quiz questions to end of day2-sessions.
Puneeth Chaganti <punchagan@fossee.in>
parents: 339
diff changeset
   544
%% ------------------ %%
19754ed6050f Moved all day2 quiz questions to end of day2-sessions.
Puneeth Chaganti <punchagan@fossee.in>
parents: 339
diff changeset
   545
19754ed6050f Moved all day2 quiz questions to end of day2-sessions.
Puneeth Chaganti <punchagan@fossee.in>
parents: 339
diff changeset
   546
\begin{frame}
19754ed6050f Moved all day2 quiz questions to end of day2-sessions.
Puneeth Chaganti <punchagan@fossee.in>
parents: 339
diff changeset
   547
    \frametitle{\incqno}
19754ed6050f Moved all day2 quiz questions to end of day2-sessions.
Puneeth Chaganti <punchagan@fossee.in>
parents: 339
diff changeset
   548
  How do you find the presence of an element \emph{x} in the list \emph{a}?
19754ed6050f Moved all day2 quiz questions to end of day2-sessions.
Puneeth Chaganti <punchagan@fossee.in>
parents: 339
diff changeset
   549
\end{frame}
19754ed6050f Moved all day2 quiz questions to end of day2-sessions.
Puneeth Chaganti <punchagan@fossee.in>
parents: 339
diff changeset
   550
19754ed6050f Moved all day2 quiz questions to end of day2-sessions.
Puneeth Chaganti <punchagan@fossee.in>
parents: 339
diff changeset
   551
19754ed6050f Moved all day2 quiz questions to end of day2-sessions.
Puneeth Chaganti <punchagan@fossee.in>
parents: 339
diff changeset
   552
\begin{frame}[fragile]
19754ed6050f Moved all day2 quiz questions to end of day2-sessions.
Puneeth Chaganti <punchagan@fossee.in>
parents: 339
diff changeset
   553
    \frametitle{\incqno}
19754ed6050f Moved all day2 quiz questions to end of day2-sessions.
Puneeth Chaganti <punchagan@fossee.in>
parents: 339
diff changeset
   554
  \begin{lstlisting}
19754ed6050f Moved all day2 quiz questions to end of day2-sessions.
Puneeth Chaganti <punchagan@fossee.in>
parents: 339
diff changeset
   555
In []: set([1, 2, 8, 2, 13, 8, 9])
19754ed6050f Moved all day2 quiz questions to end of day2-sessions.
Puneeth Chaganti <punchagan@fossee.in>
parents: 339
diff changeset
   556
  \end{lstlisting}
19754ed6050f Moved all day2 quiz questions to end of day2-sessions.
Puneeth Chaganti <punchagan@fossee.in>
parents: 339
diff changeset
   557
  What is the output?
19754ed6050f Moved all day2 quiz questions to end of day2-sessions.
Puneeth Chaganti <punchagan@fossee.in>
parents: 339
diff changeset
   558
\end{frame}
19754ed6050f Moved all day2 quiz questions to end of day2-sessions.
Puneeth Chaganti <punchagan@fossee.in>
parents: 339
diff changeset
   559
19754ed6050f Moved all day2 quiz questions to end of day2-sessions.
Puneeth Chaganti <punchagan@fossee.in>
parents: 339
diff changeset
   560
\begin{frame}[fragile]
19754ed6050f Moved all day2 quiz questions to end of day2-sessions.
Puneeth Chaganti <punchagan@fossee.in>
parents: 339
diff changeset
   561
    \frametitle{\incqno}
19754ed6050f Moved all day2 quiz questions to end of day2-sessions.
Puneeth Chaganti <punchagan@fossee.in>
parents: 339
diff changeset
   562
  \begin{lstlisting}
19754ed6050f Moved all day2 quiz questions to end of day2-sessions.
Puneeth Chaganti <punchagan@fossee.in>
parents: 339
diff changeset
   563
In []: a = {'a': 1, 'b': 2} 
19754ed6050f Moved all day2 quiz questions to end of day2-sessions.
Puneeth Chaganti <punchagan@fossee.in>
parents: 339
diff changeset
   564
In []: a['a'] = 10
19754ed6050f Moved all day2 quiz questions to end of day2-sessions.
Puneeth Chaganti <punchagan@fossee.in>
parents: 339
diff changeset
   565
In []: print a
19754ed6050f Moved all day2 quiz questions to end of day2-sessions.
Puneeth Chaganti <punchagan@fossee.in>
parents: 339
diff changeset
   566
  \end{lstlisting}
19754ed6050f Moved all day2 quiz questions to end of day2-sessions.
Puneeth Chaganti <punchagan@fossee.in>
parents: 339
diff changeset
   567
  What is the output?
19754ed6050f Moved all day2 quiz questions to end of day2-sessions.
Puneeth Chaganti <punchagan@fossee.in>
parents: 339
diff changeset
   568
\end{frame}
19754ed6050f Moved all day2 quiz questions to end of day2-sessions.
Puneeth Chaganti <punchagan@fossee.in>
parents: 339
diff changeset
   569
19754ed6050f Moved all day2 quiz questions to end of day2-sessions.
Puneeth Chaganti <punchagan@fossee.in>
parents: 339
diff changeset
   570
\begin{frame}[fragile]
19754ed6050f Moved all day2 quiz questions to end of day2-sessions.
Puneeth Chaganti <punchagan@fossee.in>
parents: 339
diff changeset
   571
    \frametitle{\incqno}
19754ed6050f Moved all day2 quiz questions to end of day2-sessions.
Puneeth Chaganti <punchagan@fossee.in>
parents: 339
diff changeset
   572
  \begin{lstlisting}
19754ed6050f Moved all day2 quiz questions to end of day2-sessions.
Puneeth Chaganti <punchagan@fossee.in>
parents: 339
diff changeset
   573
In []: for i in range(3, 10, 2):
19754ed6050f Moved all day2 quiz questions to end of day2-sessions.
Puneeth Chaganti <punchagan@fossee.in>
parents: 339
diff changeset
   574
  ...:     print i
19754ed6050f Moved all day2 quiz questions to end of day2-sessions.
Puneeth Chaganti <punchagan@fossee.in>
parents: 339
diff changeset
   575
  \end{lstlisting}
19754ed6050f Moved all day2 quiz questions to end of day2-sessions.
Puneeth Chaganti <punchagan@fossee.in>
parents: 339
diff changeset
   576
  What is the output?
19754ed6050f Moved all day2 quiz questions to end of day2-sessions.
Puneeth Chaganti <punchagan@fossee.in>
parents: 339
diff changeset
   577
\end{frame}
19754ed6050f Moved all day2 quiz questions to end of day2-sessions.
Puneeth Chaganti <punchagan@fossee.in>
parents: 339
diff changeset
   578
19754ed6050f Moved all day2 quiz questions to end of day2-sessions.
Puneeth Chaganti <punchagan@fossee.in>
parents: 339
diff changeset
   579
\begin{frame}[fragile]
19754ed6050f Moved all day2 quiz questions to end of day2-sessions.
Puneeth Chaganti <punchagan@fossee.in>
parents: 339
diff changeset
   580
    \frametitle{\incqno}
19754ed6050f Moved all day2 quiz questions to end of day2-sessions.
Puneeth Chaganti <punchagan@fossee.in>
parents: 339
diff changeset
   581
  \begin{lstlisting}
19754ed6050f Moved all day2 quiz questions to end of day2-sessions.
Puneeth Chaganti <punchagan@fossee.in>
parents: 339
diff changeset
   582
In []: a = [1, 2, 3] 
19754ed6050f Moved all day2 quiz questions to end of day2-sessions.
Puneeth Chaganti <punchagan@fossee.in>
parents: 339
diff changeset
   583
In []: a.extend([5, 6])
19754ed6050f Moved all day2 quiz questions to end of day2-sessions.
Puneeth Chaganti <punchagan@fossee.in>
parents: 339
diff changeset
   584
  \end{lstlisting}
19754ed6050f Moved all day2 quiz questions to end of day2-sessions.
Puneeth Chaganti <punchagan@fossee.in>
parents: 339
diff changeset
   585
  What is the value of a?
19754ed6050f Moved all day2 quiz questions to end of day2-sessions.
Puneeth Chaganti <punchagan@fossee.in>
parents: 339
diff changeset
   586
\end{frame}
19754ed6050f Moved all day2 quiz questions to end of day2-sessions.
Puneeth Chaganti <punchagan@fossee.in>
parents: 339
diff changeset
   587
19754ed6050f Moved all day2 quiz questions to end of day2-sessions.
Puneeth Chaganti <punchagan@fossee.in>
parents: 339
diff changeset
   588
\begin{frame}[fragile]
19754ed6050f Moved all day2 quiz questions to end of day2-sessions.
Puneeth Chaganti <punchagan@fossee.in>
parents: 339
diff changeset
   589
    \frametitle{\incqno}
19754ed6050f Moved all day2 quiz questions to end of day2-sessions.
Puneeth Chaganti <punchagan@fossee.in>
parents: 339
diff changeset
   590
  \begin{lstlisting}
19754ed6050f Moved all day2 quiz questions to end of day2-sessions.
Puneeth Chaganti <punchagan@fossee.in>
parents: 339
diff changeset
   591
In []: a = (1, 2, 3)
19754ed6050f Moved all day2 quiz questions to end of day2-sessions.
Puneeth Chaganti <punchagan@fossee.in>
parents: 339
diff changeset
   592
In []: a[1] = 10
19754ed6050f Moved all day2 quiz questions to end of day2-sessions.
Puneeth Chaganti <punchagan@fossee.in>
parents: 339
diff changeset
   593
  \end{lstlisting}
19754ed6050f Moved all day2 quiz questions to end of day2-sessions.
Puneeth Chaganti <punchagan@fossee.in>
parents: 339
diff changeset
   594
  What is the result?
19754ed6050f Moved all day2 quiz questions to end of day2-sessions.
Puneeth Chaganti <punchagan@fossee.in>
parents: 339
diff changeset
   595
\end{frame}
19754ed6050f Moved all day2 quiz questions to end of day2-sessions.
Puneeth Chaganti <punchagan@fossee.in>
parents: 339
diff changeset
   596
19754ed6050f Moved all day2 quiz questions to end of day2-sessions.
Puneeth Chaganti <punchagan@fossee.in>
parents: 339
diff changeset
   597
\begin{frame}[fragile]
19754ed6050f Moved all day2 quiz questions to end of day2-sessions.
Puneeth Chaganti <punchagan@fossee.in>
parents: 339
diff changeset
   598
    \frametitle{\incqno}
19754ed6050f Moved all day2 quiz questions to end of day2-sessions.
Puneeth Chaganti <punchagan@fossee.in>
parents: 339
diff changeset
   599
  \begin{lstlisting}
19754ed6050f Moved all day2 quiz questions to end of day2-sessions.
Puneeth Chaganti <punchagan@fossee.in>
parents: 339
diff changeset
   600
def func(x, y=10):
19754ed6050f Moved all day2 quiz questions to end of day2-sessions.
Puneeth Chaganti <punchagan@fossee.in>
parents: 339
diff changeset
   601
    print x+1, y+10
19754ed6050f Moved all day2 quiz questions to end of day2-sessions.
Puneeth Chaganti <punchagan@fossee.in>
parents: 339
diff changeset
   602
19754ed6050f Moved all day2 quiz questions to end of day2-sessions.
Puneeth Chaganti <punchagan@fossee.in>
parents: 339
diff changeset
   603
func(1)
19754ed6050f Moved all day2 quiz questions to end of day2-sessions.
Puneeth Chaganti <punchagan@fossee.in>
parents: 339
diff changeset
   604
19754ed6050f Moved all day2 quiz questions to end of day2-sessions.
Puneeth Chaganti <punchagan@fossee.in>
parents: 339
diff changeset
   605
  \end{lstlisting}
19754ed6050f Moved all day2 quiz questions to end of day2-sessions.
Puneeth Chaganti <punchagan@fossee.in>
parents: 339
diff changeset
   606
  What is the output?
19754ed6050f Moved all day2 quiz questions to end of day2-sessions.
Puneeth Chaganti <punchagan@fossee.in>
parents: 339
diff changeset
   607
\end{frame}
19754ed6050f Moved all day2 quiz questions to end of day2-sessions.
Puneeth Chaganti <punchagan@fossee.in>
parents: 339
diff changeset
   608