advanced-features-functions/slides.tex
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% Created 2010-10-28 Thu 11:37
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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{Advanced features of functions}
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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 Assigning default values to arguments
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\item Calling functions using Keyword arguments
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\item functions in standard library
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\end{itemize}
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\end{frame}
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\begin{frame}
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\frametitle{Question 1}
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\label{sec-2}
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  Redefine the function \texttt{welcome}, by interchanging it's
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  arguments. Place the \texttt{name} argument with it's default value of
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  ``World'' before the \texttt{greet} argument.
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\end{frame}
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\begin{frame}[fragile]
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\frametitle{Solution 1}
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\label{sec-3}
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\begin{verbatim}
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def welcome(name="World", greet):
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    print greet, name
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\end{verbatim}
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  We get an error that reads \texttt{SyntaxError: non-default argument   follows default argument}. When defining a function all the
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  argument with default values should come at the end.
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\end{frame}
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\begin{frame}
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\frametitle{Question 2}
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\label{sec-4}
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  See the definition of linspace using \texttt{?} and observe how all the
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  arguments with default values are towards the end.
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\end{frame}
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\begin{frame}[fragile]
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\frametitle{Solution 2}
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\label{sec-5}
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\begin{verbatim}
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linspace?
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\end{verbatim}
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\end{frame}
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\begin{frame}
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\frametitle{Question 3}
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\label{sec-6}
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  Redefine the function \texttt{welcome} with a default value of
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  ``Hello'' to the \texttt{greet} argument. Then, call the function without any
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  arguments. 
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\end{frame}
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\begin{frame}[fragile]
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\frametitle{Solution 3}
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\label{sec-7}
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\begin{verbatim}
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def welcome(greet="Hello", name="World"):
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    print greet, name
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welcome()
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\end{verbatim}
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\end{frame}
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\begin{frame}
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\frametitle{Summary}
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\label{sec-8}
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  You should now be able to --
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\begin{itemize}
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\item define functions with default arguments
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\item call functions using keyword arguments
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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-9}
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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}