#+LaTeX_CLASS: beamer
#+LaTeX_CLASS_OPTIONS: [presentation]
#+BEAMER_FRAME_LEVEL: 1

#+BEAMER_HEADER_EXTRA: \usetheme{Warsaw}\usecolortheme{default}\useoutertheme{infolines}\setbeamercovered{transparent}
#+COLUMNS: %45ITEM %10BEAMER_env(Env) %10BEAMER_envargs(Env Args) %4BEAMER_col(Col) %8BEAMER_extra(Extra)
#+PROPERTY: BEAMER_col_ALL 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 :ETC

#+LaTeX_CLASS: beamer
#+LaTeX_CLASS_OPTIONS: [presentation]

#+LaTeX_HEADER: \usepackage[english]{babel} \usepackage{ae,aecompl}
#+LaTeX_HEADER: \usepackage{mathpazo,courier,euler} \usepackage[scaled=.95]{helvet}

#+LaTeX_HEADER: \usepackage{listings}

#+LaTeX_HEADER:\lstset{language=Python, basicstyle=\ttfamily\bfseries,
#+LaTeX_HEADER:  commentstyle=\color{red}\itshape, stringstyle=\color{darkgreen},
#+LaTeX_HEADER:  showstringspaces=false, keywordstyle=\color{blue}\bfseries}

#+TITLE:    Advanced features of functions
#+AUTHOR:    FOSSEE
#+EMAIL:     
#+DATE:    

#+DESCRIPTION: 
#+KEYWORDS: 
#+LANGUAGE:  en
#+OPTIONS:   H:3 num:nil toc:nil \n:nil @:t ::t |:t ^:t -:t f:t *:t <:t
#+OPTIONS:   TeX:t LaTeX:nil skip:nil d:nil todo:nil pri:nil tags:not-in-toc

* 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