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+++ b/dictionaries/slides.tex	Mon Oct 11 23:03:49 2010 +0530
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+% Created 2010-10-11 Mon 23:02
+\documentclass[presentation]{beamer}
+\usepackage[latin1]{inputenc}
+\usepackage[T1]{fontenc}
+\usepackage{fixltx2e}
+\usepackage{graphicx}
+\usepackage{longtable}
+\usepackage{float}
+\usepackage{wrapfig}
+\usepackage{soul}
+\usepackage{t1enc}
+\usepackage{textcomp}
+\usepackage{marvosym}
+\usepackage{wasysym}
+\usepackage{latexsym}
+\usepackage{amssymb}
+\usepackage{hyperref}
+\tolerance=1000
+\usepackage[english]{babel} \usepackage{ae,aecompl}
+\usepackage{mathpazo,courier,euler} \usepackage[scaled=.95]{helvet}
+\usepackage{listings}
+\lstset{language=Python, basicstyle=\ttfamily\bfseries,
+commentstyle=\color{red}\itshape, stringstyle=\color{darkgreen},
+showstringspaces=false, keywordstyle=\color{blue}\bfseries}
+\providecommand{\alert}[1]{\textbf{#1}}
+
+\title{Dictionaries}
+\author{FOSSEE}
+\date{}
+
+\usetheme{Warsaw}\usecolortheme{default}\useoutertheme{infolines}\setbeamercovered{transparent}
+\begin{document}
+
+\maketitle
+
+
+
+
+
+
+
+
+
+\begin{frame}
+\frametitle{Outline}
+\label{sec-1}
+
+\begin{itemize}
+\item Creating dictionaries
+
+\begin{itemize}
+\item empty dictionaries
+\item with data
+\end{itemize}
+
+\item Keys and values
+\item Checking for elements
+\item Iterating over elements
+\end{itemize}
+\end{frame}
+\begin{frame}
+\frametitle{Overview of Dictionaries}
+\label{sec-2}
+
+\begin{itemize}
+\item A dictionary contains meaning of words
+
+\begin{itemize}
+\item \emph{Word} is the \emph{key} here.
+\item \emph{Meaning} is the \emph{value} here.
+\end{itemize}
+
+\item A Key-Value pair data structure
+
+\begin{itemize}
+\item Provide key-value mappings
+\end{itemize}
+
+\end{itemize}
+\end{frame}
+\begin{frame}[fragile]
+\frametitle{Creating dictionary}
+\label{sec-3}
+
+\begin{itemize}
+\item Empty dictionary
+
+\begin{itemize}
+\item \texttt{mt\_dict = \{\}}
+
+\begin{itemize}
+\item \texttt{[]} - lists
+\item \texttt{\{\}} - dictionaries
+\end{itemize}
+
+\end{itemize}
+
+\item With data
+\begin{verbatim}
+extensions = {'jpg' : 'JPEG Image', 
+              'py' : 'Python script',
+              'html' : 'Html document', 
+              'pdf' : 'Portable Document Format'}
+\end{verbatim}
+
+   \textbf{Note} - ordering in dictionaries cannot be relied on
+\end{itemize}
+\end{frame}
+\begin{frame}[fragile]
+\frametitle{Accessing Elements}
+\label{sec-4}
+
+\begin{itemize}
+\item syntax
+\begin{verbatim}
+     extensions[key]
+\end{verbatim}
+
+\end{itemize}
+
+  
+\begin{verbatim}
+   In []: print extensions['jpg']
+   Out []: JPEG Image
+   In []: print extensions['zip']
+\end{verbatim}
+\end{frame}
+\begin{frame}[fragile]
+\frametitle{Adding and Deleting values}
+\label{sec-5}
+
+\begin{itemize}
+\item Adding a new value
+\begin{verbatim}
+     In []: extension['cpp'] = 'C++ code'
+\end{verbatim}
+
+    adds a new key \emph{cpp} with \emph{C++ code} as value
+\item Deleting values
+\begin{verbatim}
+     In []: del extensions['pdf']
+\end{verbatim}
+
+    deletes the key-value pair identified by \emph{pdf}
+\item Changing value associated with a key
+\begin{verbatim}
+     In []: extension['cpp'] = 'C++ source code'
+\end{verbatim}
+
+    changes the value of the existing key
+\end{itemize}
+\end{frame}
+\begin{frame}[fragile]
+\frametitle{Checking for container-ship of keys}
+\label{sec-6}
+
+\begin{verbatim}
+   In []: 'py' in extensions
+   Out []: True
+\end{verbatim}
+
+  Returns \textbf{True} if the \emph{key} is found.
+\begin{verbatim}
+   In []: 'odt' in extensions
+   Out []: False
+\end{verbatim}
+
+  Returns \textbf{False} if the \emph{key} is not found.
+\end{frame}
+\begin{frame}[fragile]
+\frametitle{Retrieve keys and values}
+\label{sec-7}
+
+\begin{itemize}
+\item \texttt{.keys()} method
+\begin{verbatim}
+     In []: extensions.keys()
+\end{verbatim}
+
+    Returns a list of keys in the dictionary.
+\item \texttt{.values()} method
+\begin{verbatim}
+     In []: extensions.values()
+\end{verbatim}
+
+    Returns the list of values in the dictionary.
+\end{itemize}
+\end{frame}
+\begin{frame}
+\frametitle{Exercise 1}
+\label{sec-8}
+
+  Print the keys and values in the dictionary one by one.
+\end{frame}
+\begin{frame}
+\frametitle{Summary}
+\label{sec-9}
+
+\begin{itemize}
+\item Creating dictionaries
+
+\begin{itemize}
+\item empty dictionaries
+\item with data
+\end{itemize}
+
+\item \texttt{.keys()} method
+\item \texttt{.values()} method
+\item Iterating over dictionaries
+\end{itemize}
+\end{frame}
+\begin{frame}
+\frametitle{Thank you!}
+\label{sec-10}
+
+  \begin{block}{}
+  \begin{center}
+  This spoken tutorial has been produced by the
+  \textcolor{blue}{FOSSEE} team, which is funded by the 
+  \end{center}
+  \begin{center}
+    \textcolor{blue}{National Mission on Education through \\
+      Information \& Communication Technology \\ 
+      MHRD, Govt. of India}.
+  \end{center}  
+  \end{block}
+\end{frame}
+
+\end{document}