dictionaries/slides.org
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#+LaTeX_CLASS: beamer
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#+LaTeX_CLASS_OPTIONS: [presentation]
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#+BEAMER_FRAME_LEVEL: 1
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#+BEAMER_HEADER_EXTRA: \usetheme{Warsaw}\usecolortheme{default}\useoutertheme{infolines}\setbeamercovered{transparent}
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#+COLUMNS: %45ITEM %10BEAMER_env(Env) %10BEAMER_envargs(Env Args) %4BEAMER_col(Col) %8BEAMER_extra(Extra)
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#+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
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#+LaTeX_CLASS: beamer
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#+LaTeX_CLASS_OPTIONS: [presentation]
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#+LaTeX_HEADER: \usepackage[english]{babel} \usepackage{ae,aecompl}
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#+LaTeX_HEADER: \usepackage{mathpazo,courier,euler} \usepackage[scaled=.95]{helvet}
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#+LaTeX_HEADER: \usepackage{listings}
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#+LaTeX_HEADER:\lstset{language=Python, basicstyle=\ttfamily\bfseries,
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#+LaTeX_HEADER:  commentstyle=\color{red}\itshape, stringstyle=\color{darkgreen},
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#+LaTeX_HEADER:  showstringspaces=false, keywordstyle=\color{blue}\bfseries}
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#+TITLE: Dictionaries
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#+AUTHOR: FOSSEE
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#+EMAIL: info@fossee.in   
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#+DATE:    
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#+DESCRIPTION: 
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#+KEYWORDS: 
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#+LANGUAGE:  en
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#+OPTIONS:   H:3 num:nil toc:nil \n:nil @:t ::t |:t ^:t -:t f:t *:t <:t
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#+OPTIONS:   TeX:t LaTeX:nil skip:nil d:nil todo:nil pri:nil tags:not-in-toc
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* Outline
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  - Creating dictionaries
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    - empty dictionaries
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    - with data
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  - Keys and values
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  - Checking for elements
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  - Iterating over elements
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* Overview of Dictionaries
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  - A dictionary contains meaning of words
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    - /Word/ is the /key/ here.
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    - /Meaning/ is the /value/ here.
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  - A Key-Value pair data structure
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    - Provide key-value mappings
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* Creating dictionary
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  - Empty dictionary
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    - ~mt_dict = {}~
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      - ~[]~ - lists
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      - ~{}~ - dictionaries
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  - With data
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    #+begin_src python
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        extensions = {'jpg' : 'JPEG Image', 
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	              'py' : 'Python script',
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                      'html' : 'Html document', 
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                      'pdf' : 'Portable Document Format'}
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    #+end_src
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   *Note* - ordering in dictionaries cannot be relied on
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* Accessing Elements
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  - syntax
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    : extensions[key]
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  : In []: print extensions['jpg']
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  : Out []: JPEG Image
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  : In []: print extensions['zip']
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* Adding and Deleting values
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  - Adding a new value
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    : In []: extension['cpp'] = 'C++ code'
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    adds a new key /cpp/ with /C++ code/ as value
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  - Deleting values
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    : In []: del extensions['pdf']
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    deletes the key-value pair identified by /pdf/
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  - Changing value associated with a key
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    : In []: extension['cpp'] = 'C++ source code'
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    changes the value of the existing key
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* Checking for container-ship of keys
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  : In []: 'py' in extensions
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  : Out []: True
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  Returns *True* if the /key/ is found.
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  : In []: 'odt' in extensions
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  : Out []: False
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  Returns *False* if the /key/ is not found.
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* Retrieve keys and values
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  - ~.keys()~ method
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    : In []: extensions.keys()
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    Returns a list of keys in the dictionary.
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  - ~.values()~ method
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    : In []: extensions.values()
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    Returns the list of values in the dictionary.
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* Exercise 1
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  Print the keys and values in the dictionary one by one.
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* Summary
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  - Creating dictionaries
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    - empty dictionaries
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    - with data
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  - ~.keys()~ method
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  - ~.values()~ method
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  - Iterating over dictionaries
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* Thank you!
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#+begin_latex
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  \begin{block}{}
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  \begin{center}
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  This spoken tutorial has been produced by the
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  \textcolor{blue}{FOSSEE} team, which is funded by the 
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  \end{center}
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  \begin{center}
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    \textcolor{blue}{National Mission on Education through \\
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      Information \& Communication Technology \\ 
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      MHRD, Govt. of India}.
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  \end{center}  
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  \end{block}
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#+end_latex
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