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