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13 #+LaTeX_HEADER: \usepackage{mathpazo,courier,euler} \usepackage[scaled=.95]{helvet} |
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17 #+LaTeX_HEADER:\lstset{language=Python, basicstyle=\ttfamily\bfseries, |
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19 #+LaTeX_HEADER: showstringspaces=false, keywordstyle=\color{blue}\bfseries} |
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20 |
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21 #+TITLE: Dictionaries |
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22 #+AUTHOR: FOSSEE |
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23 #+EMAIL: info@fossee.in |
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24 #+DATE: |
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25 |
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26 #+DESCRIPTION: |
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27 #+KEYWORDS: |
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28 #+LANGUAGE: en |
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29 #+OPTIONS: H:3 num:nil toc:nil \n:nil @:t ::t |:t ^:t -:t f:t *:t <:t |
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30 #+OPTIONS: TeX:t LaTeX:nil skip:nil d:nil todo:nil pri:nil tags:not-in-toc |
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31 |
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32 * Outline |
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33 - Creating dictionaries |
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34 - empty dictionaries |
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35 - with data |
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36 - Keys and values |
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37 - Checking for elements |
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38 - Iterating over elements |
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39 |
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40 * Overview of Dictionaries |
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41 - A dictionary contains meaning of words |
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42 - /Word/ is the /key/ here. |
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43 - /Meaning/ is the /value/ here. |
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44 - A Key-Value pair data structure |
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45 - Provide key-value mappings |
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46 |
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47 * Creating dictionary |
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48 - Empty dictionary |
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49 - ~mt_dict = {}~ |
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50 - ~[]~ - lists |
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51 - ~{}~ - dictionaries |
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52 - With data |
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53 #+begin_src python |
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54 extensions = {'jpg' : 'JPEG Image', |
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55 'py' : 'Python script', |
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56 'html' : 'Html document', |
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57 'pdf' : 'Portable Document Format'} |
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58 #+end_src |
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59 |
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60 *Note* - ordering in dictionaries cannot be relied on |
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61 * Accessing Elements |
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62 - syntax |
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63 : extensions[key] |
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64 |
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65 : In []: print extensions['jpg'] |
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66 : Out []: JPEG Image |
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67 : In []: print extensions['zip'] |
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68 * Adding and Deleting values |
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69 - Adding a new value |
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70 : In []: extension['cpp'] = 'C++ code' |
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71 adds a new key /cpp/ with /C++ code/ as value |
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72 - Deleting values |
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73 : In []: del extensions['pdf'] |
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74 deletes the key-value pair identified by /pdf/ |
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75 - Changing value associated with a key |
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76 : In []: extension['cpp'] = 'C++ source code' |
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77 changes the value of the existing key |
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78 * Checking for container-ship of keys |
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79 : In []: 'py' in extensions |
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80 : Out []: True |
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81 Returns *True* if the /key/ is found. |
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82 : In []: 'odt' in extensions |
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83 : Out []: False |
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84 Returns *False* if the /key/ is not found. |
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85 |
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86 * Retrieve keys and values |
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87 - ~.keys()~ method |
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88 : In []: extensions.keys() |
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89 Returns a list of keys in the dictionary. |
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90 - ~.values()~ method |
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91 : In []: extensions.values() |
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92 Returns the list of values in the dictionary. |
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93 * Exercise 1 |
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94 Print the keys and values in the dictionary one by one. |
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95 * Summary |
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96 - Creating dictionaries |
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97 - empty dictionaries |
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98 - with data |
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99 - ~.keys()~ method |
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100 - ~.values()~ method |
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101 - Iterating over dictionaries |
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102 * Thank you! |
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103 #+begin_latex |
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104 \begin{block}{} |
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105 \begin{center} |
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106 This spoken tutorial has been produced by the |
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107 \textcolor{blue}{FOSSEE} team, which is funded by the |
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108 \end{center} |
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109 \begin{center} |
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110 \textcolor{blue}{National Mission on Education through \\ |
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111 Information \& Communication Technology \\ |
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112 MHRD, Govt. of India}. |
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113 \end{center} |
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114 \end{block} |
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115 #+end_latex |
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116 |
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117 |