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    20 

    21 #+TITLE:    Advanced features of functions

    22 #+AUTHOR:    FOSSEE

    23 #+EMAIL:     

    24 #+DATE:    

    25 

    26 #+DESCRIPTION: 

    27 #+KEYWORDS: 

    28 #+LANGUAGE:  en

    29 #+OPTIONS:   H:3 num:nil toc:nil \n:nil @:t ::t |:t ^:t -:t f:t *:t <:t

    30 #+OPTIONS:   TeX:t LaTeX:nil skip:nil d:nil todo:nil pri:nil tags:not-in-toc

    31 

    32 * Outline

    33   - Assigning default values to arguments

    34   - Calling functions using Keyword arguments

    35   - functions in standard library 

    36 * Question 1

    37   Redefine the function ~welcome~, by interchanging it's

    38   arguments. Place the ~name~ argument with it's default value of

    39   "World" before the ~greet~ argument.

    40 * Solution 1

    41   #+begin_src python

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

    43         print greet, name

    44   #+end_src

    45   We get an error that reads ~SyntaxError: non-default argument

    46   follows default argument~. When defining a function all the

    47   argument with default values should come at the end.

    48 

    49 * Question 2

    50   See the definition of linspace using ~?~ and observe how all the

    51   arguments with default values are towards the end.

    52 * Solution 2

    53   #+begin_src python

    54     linspace?

    55   #+end_src

    56 * Question 3

    57   Redefine the function ~welcome~ with a default value of

    58   "Hello" to the ~greet~ argument. Then, call the function without any

    59   arguments. 

    60 * Solution 3

    61   #+begin_src python

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

    63         print greet, name

    64      

    65     welcome()

    66   #+end_src

    67 * Summary

    68   You should now be able to --

    69   + define functions with default arguments

    70   + call functions using keyword arguments

    71 * Thank you!

    72 #+begin_latex

    73   \begin{block}{}

    74   \begin{center}

    75   This spoken tutorial has been produced by the

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

    77   \end{center}

    78   \begin{center}

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

    80       Information \& Communication Technology \\ 

    81       MHRD, Govt. of India}.

    82   \end{center}  

    83   \end{block}

    84 #+end_latex

    85 

    86