1 % Created 2010-10-28 Thu 11:37

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

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

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

    25 \providecommand{\alert}[1]{\textbf{#1}}

    26 

    27 \title{Advanced features of functions}

    28 \author{FOSSEE}

    29 \date{}

    30 

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

    32 \begin{document}

    33 

    34 \maketitle

    35 

    36 

    37 

    38 

    39 

    40 

    41 

    42 

    43 

    44 \begin{frame}

    45 \frametitle{Outline}

    46 \label{sec-1}

    47 

    48 \begin{itemize}

    49 \item Assigning default values to arguments

    50 \item Calling functions using Keyword arguments

    51 \item functions in standard library

    52 \end{itemize}

    53 \end{frame}

    54 \begin{frame}

    55 \frametitle{Question 1}

    56 \label{sec-2}

    57 

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

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

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

    61 \end{frame}

    62 \begin{frame}[fragile]

    63 \frametitle{Solution 1}

    64 \label{sec-3}

    65 

    66 \begin{verbatim}

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

    68     print greet, name

    69 \end{verbatim}

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

    71   argument with default values should come at the end.

    72 \end{frame}

    73 \begin{frame}

    74 \frametitle{Question 2}

    75 \label{sec-4}

    76 

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

    78   arguments with default values are towards the end.

    79 \end{frame}

    80 \begin{frame}[fragile]

    81 \frametitle{Solution 2}

    82 \label{sec-5}

    83 

    84 \begin{verbatim}

    85 linspace?

    86 \end{verbatim}

    87 \end{frame}

    88 \begin{frame}

    89 \frametitle{Question 3}

    90 \label{sec-6}

    91 

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

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

    94   arguments. 

    95 \end{frame}

    96 \begin{frame}[fragile]

    97 \frametitle{Solution 3}

    98 \label{sec-7}

    99 

   100 \begin{verbatim}

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

   102     print greet, name

   103 

   104 welcome()

   105 \end{verbatim}

   106 \end{frame}

   107 \begin{frame}

   108 \frametitle{Summary}

   109 \label{sec-8}

   110 

   111   You should now be able to --

   112 \begin{itemize}

   113 \item define functions with default arguments

   114 \item call functions using keyword arguments

   115 \end{itemize}

   116 \end{frame}

   117 \begin{frame}

   118 \frametitle{Thank you!}

   119 \label{sec-9}

   120 

   121   \begin{block}{}

   122   \begin{center}

   123   This spoken tutorial has been produced by the

   124   \textcolor{blue}{FOSSEE} team, which is funded by the 

   125   \end{center}

   126   \begin{center}

   127     \textcolor{blue}{National Mission on Education through \\

   128       Information \& Communication Technology \\ 

   129       MHRD, Govt. of India}.

   130   \end{center}  

   131   \end{block}

   132 \end{frame}

   133 

   134 \end{document}