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#+TITLE:    Advanced features of functions

#+AUTHOR:    FOSSEE

#+EMAIL:     

#+DATE:    

#+DESCRIPTION: 

#+KEYWORDS: 

#+LANGUAGE:  en

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* Outline

  - Assigning default values to arguments

  - Calling functions using Keyword arguments

  - functions in standard library 

* Question 1

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

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

  "World" before the ~greet~ argument.

* Solution 1

  #+begin_src python

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

        print greet, name

  #+end_src

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

  follows default argument~. When defining a function all the

  argument with default values should come at the end.

* Question 2

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

  arguments with default values are towards the end.

* Solution 2

  #+begin_src python

    linspace?

  #+end_src

* Question 3

  Redefine the function ~welcome~ with a default value of

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

  arguments. 

* Solution 3

  #+begin_src python

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

        print greet, name

    welcome()

  #+end_src

* Summary

  You should now be able to --

  + define functions with default arguments

  + call functions using keyword arguments

* Thank you!

#+begin_latex

  \begin{block}{}

  \begin{center}

  This spoken tutorial has been produced by the

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

  \end{center}

  \begin{center}

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

      Information \& Communication Technology \\ 

      MHRD, Govt. of India}.

  \end{center}  

  \end{block}

#+end_latex