#+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: 
#+AUTHOR: FOSSEE
#+EMAIL: info@fossee.in   
#+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

* 
#+begin_latex
\begin{center}
\vspace{12pt}
\textcolor{blue}{\huge Dictionaries}
\end{center}
\vspace{18pt}
\begin{center}
\vspace{10pt}
\includegraphics[scale=0.95]{../images/fossee-logo.png}\\
\vspace{5pt}
\scriptsize Developed by FOSSEE Team, IIT-Bombay. \\ 
\scriptsize Funded by National Mission on Education through ICT\\
\scriptsize  MHRD,Govt. of India\\
\includegraphics[scale=0.30]{../images/iitb-logo.png}\\
\end{center}
#+end_latex

* Objectives
  At the end of this tutorial, you will be able to,

 - Create dictionaries.
 - Add and delete data from dictionaries.
 - Retrieve data from dictionaries.
 - Check for container-ship of keys.
 - Iterate over elements.

* Pre-requiste
Spoken tutorial on -
  - Basic datatypes and operators
* Overview of Dictionaries
  - A dictionary contains meaning of words
    - /Word/ is the /key/ here.
    - /Meaning/ is the /value/ here.
  - A Key-Value pair data structure
    - Provide key-value mappings

* Accessing Elements
  - syntax
    : extensions[key]
* Retrieve keys and values
  - ~.keys()~ method
    : In []: extensions.keys()
    Returns a list of keys in the dictionary.
  - ~.values()~ method
    : In []: extensions.values()
    Returns the list of values in the dictionary.
* Exercise 1
 - Print the keys and values in the dictionary one by one.
* Summary
  In this tutorial, we have learnt to,

 - Create dictionaries namely --
    - empty dictionaries
    - dictionaries with data.
 - Access elements in the dictionaries using the keys.
 - Add elements to a dictionary by assigning a value to a key.
 - Delete elements from a dictionary by using the function ``del''.
 - Retrieve the keys and values by using the methods ``.keys()'' and 
    ``.values()'' respectively.
 - Iterate over elements of a dictionary using a ``for'' loop.
* Evaluation
1. Container-ship of values can be checked in a python dictionary

   - True
   - False

2. Consider the python dictionary 
   
   : x = {'a':['a','b','c'], 'b':(1, 2, 3),
   :       1:{1:'one', 2:'two'},
   :       10:{10:'ten', 11:'eleven'}}

   What will the following code return? 
     ~(1, 2, 3) in x.values()~ 

   - True
   - False
   - Container-ship of values cannot be checked in dictionaries
   - The dictionary is invalid
* Solutions
1. False

2. True
* 
#+begin_latex
  \begin{block}{}
  \begin{center}
  \textcolor{blue}{\Large THANK YOU!} 
  \end{center}
  \end{block}
\begin{block}{}
  \begin{center}
    For more Information, visit our website\\
    \url{http://fossee.in/}
  \end{center}  
  \end{block}
#+end_latex