% Created 2010-10-11 Mon 00:34

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\usepackage{listings}

\lstset{language=Python, basicstyle=\ttfamily\bfseries,

commentstyle=\color{red}\itshape, stringstyle=\color{darkgreen},

showstringspaces=false, keywordstyle=\color{blue}\bfseries}

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\title{Advanced features of functions}

\author{FOSSEE}

\usetheme{Warsaw}\usecolortheme{default}\useoutertheme{infolines}\setbeamercovered{transparent}

\maketitle

\frametitle{Outline}

\label{sec-1}

\begin{itemize}

\item Assigning default values to arguments

\item Calling functions using Keyword arguments

\item functions in standard library

\end{itemize}

\begin{frame}

\frametitle{Question 1}

\label{sec-2}

  Redefine the function \texttt{welcome}, by interchanging it's

  arguments. Place the \texttt{name} argument with it's default value of

  ``World'' before the \texttt{greet} argument.

\end{frame}

\frametitle{Solution 1}

\label{sec-3}

\lstset{language=Python}

\begin{lstlisting}

def welcome(name="World", greet):

    print greet, name

\end{lstlisting}

  We get an error that reads \texttt{SyntaxError: non-default argument   follows default argument}. When defining a function all the

  argument with default values should come at the end.

\begin{frame}

\frametitle{Question 2}

\label{sec-4}

  See the definition of linspace using \texttt{?} and observe how all the

  arguments with default values are towards the end.

\end{frame}

\begin{frame}[fragile]

\frametitle{Solution 2}

\label{sec-5}

\lstset{language=Python}

\begin{lstlisting}

linspace?

\end{lstlisting}

\end{frame}

\begin{frame}

\frametitle{Question 3}

\label{sec-6}

  Redefine the function \texttt{welcome} with a default value of

  ``Hello'' to the \texttt{greet} argument. Then, call the function without any

  arguments. 

\end{frame}

\frametitle{Solution 3}

\label{sec-7}

\lstset{language=Python}

\begin{lstlisting}

def welcome(greet="Hello", name="World"):

    print greet, name

welcome()

\end{lstlisting}

\frametitle{Summary}

\label{sec-8}

  You should now be able to --

\begin{itemize}

\item define functions with default arguments

\item call functions using keyword arguments

\end{itemize}

\end{frame}

\begin{frame}

\frametitle{Thank you!}

\label{sec-9}