1 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

     2 %Tutorial slides on Python.

     3 %

     4 % Author: The FOSSEE Group

     5 % Copyright (c) 2009, The FOSSEE Group, IIT Bombay

     6 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

     7 

     8 \documentclass[14pt,compress]{beamer}

     9 %\documentclass[draft]{beamer}

    10 %\documentclass[compress,handout]{beamer}

    11 %\usepackage{pgfpages} 

    12 %\pgfpagesuselayout{2 on 1}[a4paper,border shrink=5mm]

    13 

    14 % Modified from: generic-ornate-15min-45min.de.tex

    15 \mode<presentation>

    16 {

    17   \usetheme{Warsaw}

    18   \useoutertheme{split}

    19   \setbeamercovered{transparent}

    20 }

    21 

    22 \usepackage[english]{babel}

    23 \usepackage[latin1]{inputenc}

    24 %\usepackage{times}

    25 \usepackage[T1]{fontenc}

    26 

    27 % Taken from Fernando's slides.

    28 \usepackage{ae,aecompl}

    29 \usepackage{mathpazo,courier,euler}

    30 \usepackage[scaled=.95]{helvet}

    31 

    32 \definecolor{darkgreen}{rgb}{0,0.5,0}

    33 

    34 \usepackage{listings}

    35 \lstset{language=Python,

    36     basicstyle=\ttfamily\bfseries,

    37     commentstyle=\color{red}\itshape,

    38   stringstyle=\color{darkgreen},

    39   showstringspaces=false,

    40   keywordstyle=\color{blue}\bfseries}

    41 

    42 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

    43 % Macros

    44 \setbeamercolor{emphbar}{bg=blue!20, fg=black}

    45 \newcommand{\emphbar}[1]

    46 {\begin{beamercolorbox}[rounded=true]{emphbar} 

    47       {#1}

    48  \end{beamercolorbox}

    49 }

    50 \newcounter{time}

    51 \setcounter{time}{0}

    52 \newcommand{\inctime}[1]{\addtocounter{time}{#1}{\tiny \thetime\ m}}

    53 

    54 \newcommand{\typ}[1]{\texttt{#1}}

    55 

    56 \newcommand{\kwrd}[1]{ \texttt{\textbf{\color{blue}{#1}}}  }

    57 

    58 %%% This is from Fernando's setup.

    59 % \usepackage{color}

    60 % \definecolor{orange}{cmyk}{0,0.4,0.8,0.2}

    61 % % Use and configure listings package for nicely formatted code

    62 % \usepackage{listings}

    63 % \lstset{

    64 %    language=Python,

    65 %    basicstyle=\small\ttfamily,

    66 %    commentstyle=\ttfamily\color{blue},

    67 %    stringstyle=\ttfamily\color{orange},

    68 %    showstringspaces=false,

    69 %    breaklines=true,

    70 %    postbreak = \space\dots

    71 % }

    72 

    73 

    74 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

    75 % Title page

    76 \title[Basic Python]{Python:\\A great programming toolkit}

    77 

    78 \author[FOSEE Team] {The FOSSEE Group}

    79 

    80 \institute[IIT Bombay] {Department of Aerospace Engineering\\IIT Bombay}

    81 \date[] {31, October 2009\\Day 1, Session 2}

    82 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

    83 

    84 %\pgfdeclareimage[height=0.75cm]{iitmlogo}{iitmlogo}

    85 %\logo{\pgfuseimage{iitmlogo}}

    86 

    87 

    88 %% Delete this, if you do not want the table of contents to pop up at

    89 %% the beginning of each subsection:

    90 \AtBeginSubsection[]

    91 {

    92   \begin{frame}<beamer>

    93     \frametitle{Outline}

    94     \tableofcontents[currentsection,currentsubsection]

    95   \end{frame}

    96 }

    97 

    98 \AtBeginSection[]

    99 {

   100   \begin{frame}<beamer>

   101     \frametitle{Outline}

   102     \tableofcontents[currentsection,currentsubsection]

   103   \end{frame}

   104 }

   105 

   106 % If you wish to uncover everything in a step-wise fashion, uncomment

   107 % the following command: 

   108 %\beamerdefaultoverlayspecification{<+->}

   109 

   110 %\includeonlyframes{current,current1,current2,current3,current4,current5,current6}

   111 

   112 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

   113 % DOCUMENT STARTS

   114 \begin{document}

   115 

   116 \begin{frame}

   117   \titlepage

   118 \end{frame}

   119 \begin{frame}

   120   {Acknowledgements}

   121   \begin{center}

   122   This program is conducted by\\

   123   IIT, Bombay\\

   124   as part of  the open source initiatives\\

   125   under the aegis of\\

   126   \alert{National Mission on Education through ICT,} \\

   127   Ministry of HRD.

   128   \end{center}

   129 \end{frame}

   130 

   131 \begin{frame}

   132   \frametitle{Outline}

   133   \tableofcontents

   134   % You might wish to add the option [pausesections]

   135 \end{frame}

   136 

   137 \section{Functions}

   138 \begin{frame}{Functions: Definition}

   139 \begin{itemize}

   140   \item \kwrd{def} keyword

   141 \end{itemize}

   142 \end{frame}

   143 

   144 \begin{frame}[fragile]

   145 \frametitle{Functions: Example 1}

   146   \begin{lstlisting}

   147 In [1]: def plot_sinx():

   148    ....:     x = linspace(0, 2*pi, 100)

   149    ....:     plt.plot(x, sin(x))

   150    ....:     plt.show()

   151    ....:    

   152 

   153 In [2]: plot_sinx()

   154   \end{lstlisting}

   155 \end{frame}

   156 

   157 \begin{frame}[fragile]

   158 \frametitle{Functions: Example 2}

   159   \begin{lstlisting}

   160 In [3]: def f(x):

   161    ....:     return sin(x*x*x)+(3*x*x)

   162 

   163 In [4]: x = linspace(0,2*pi, 1000)

   164 

   165 In [5]: plt.plot(x, f(x))

   166   \end{lstlisting}

   167   \inctime{10}

   168 \end{frame}

   169 

   170 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

   171 % TIME: 10 m, running 

   172 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

   173 

   174 \section{Creating and running scripts}

   175 \begin{frame}

   176   {Creating python files}

   177   \begin{itemize}

   178     \item aka scripts

   179     \item use your editor

   180     \item extension \typ{.py}

   181     \item run with \texttt{python hello.py} at the command line

   182     \item in IPython using \kwrd{\%run}

   183   \end{itemize}

   184 \inctime{5}

   185 \end{frame}

   186 

   187 \section{Files Handling}

   188 \begin{frame}[fragile]

   189   \frametitle{Basic File Operations}

   190 Opening and Reading files

   191 \begin{lstlisting}

   192 In [6]: f = open('/path/to/file_name')

   193 In [7]: data = f.read() # Read entire file.

   194 In [8]: line = f.readline() # Read one line.

   195 In [9]: f.close() # close the file.

   196 \end{lstlisting}

   197 Writing files

   198 \begin{lstlisting}

   199 In [10]: f = open('/path/to/file_name', 'w')

   200 In [11]: f.write('hello world\n')

   201 In [12]: f.close()

   202 \end{lstlisting}

   203 \begin{itemize}

   204     \item Everything read or written is a string

   205 \end{itemize}

   206 \end{frame}

   207 

   208 \begin{frame}[fragile]

   209     \frametitle{File and \kwrd{for}}

   210 \begin{lstlisting}

   211 In [13]: f = open('dummyfile')

   212 

   213 In [14]: for line in f:

   214     ...:     print line

   215     ...:  

   216 \end{lstlisting}

   217 \inctime{10}

   218 \end{frame}

   219 

   220 \section{Strings}

   221 \begin{frame}[fragile]

   222   \frametitle{Strings}

   223   \begin{lstlisting}

   224 s = 'this is a string'

   225 s = 'This one has "quotes" inside!'

   226 s = "I have 'single-quotes' inside!"

   227 l = "A string spanning many lines\

   228 one more line\

   229 yet another"

   230 t = """A triple quoted string does

   231 not need to be escaped at the end and 

   232 "can have nested quotes" etc."""

   233   \end{lstlisting}

   234 \end{frame}

   235 

   236 \begin{frame}[fragile]\frametitle{Strings and \typ{split()}}

   237   \begin{lstlisting}

   238 In [15]: a = 'hello world'

   239 

   240 In [16]: a.split()

   241 Out[17]: ['hello', 'world']

   242   \end{lstlisting}

   243 Now try this:

   244   \begin{lstlisting}

   245 In [18]: b = 'KD, Madhu, Punchagan, Shantanu, Vattam'

   246 

   247 In [19]: b.split(',')

   248 Out[20]: ['KD', ' Madhu', ' Punchagan', ' Shantanu', ' Vattam']

   249   \end{lstlisting}

   250 \inctime{5}

   251 \end{frame}

   252 

   253 \section{Plotting points}

   254 \begin{frame}[fragile]

   255 \frametitle{How to plot points?}

   256 We saw how to plot graphs, lets now look at how to plot points.\\

   257 \begin{lstlisting}

   258 In [21]: plt.plot(x, sin(x), 'ro')

   259 Out[22]: [<matplotlib.lines.Line2D object at 0xac17e0c>]

   260 \end{lstlisting}

   261 \begin{itemize}

   262   \item \kwrd{'r'},\kwrd{'g'},\kwrd{'b'} for red, green and blue

   263   \item \kwrd{'o'} - Dots

   264   \item \kwrd{'-'} - Lines

   265   \item \kwrd{'- -'} - Dashed lines

   266 \end{itemize}

   267 \inctime{5}

   268 \end{frame}

   269 

   270 \section{Lists}

   271 

   272 \begin{frame}[fragile]

   273   \frametitle{List creation and indexing}

   274 \begin{lstlisting}

   275 In [23]: lst = [] #Empty list

   276 

   277 In [24]: lst = [1,2,3,4] #More useful list

   278 

   279 In [25]: len(lst)

   280 Out[26]: 4

   281 

   282 In [27]: lst[0]+lst[1]+lst[-1]

   283 Out[27]: 7

   284 \end{lstlisting}

   285 \begin{itemize}

   286   \item Indices start with ?

   287   \item Negative indices indicate ?

   288   \end{itemize}

   289 \end{frame}

   290 

   291 \begin{frame}[fragile]

   292   \frametitle{List: slices}

   293   \begin{itemize}

   294   \item Slicing is a basic operation

   295   \item \typ{list[initial:final:step]}

   296   \item  The step is optional

   297   \end{itemize}

   298 \begin{lstlisting}

   299 In [28]: lst[1:3]  # A slice.

   300 Out[28]: [2, 3]

   301 

   302 In [29]: lst[1:-1]

   303 Out[29]: [2, 3]

   304 

   305 In [30]: lst[1:] == lst[1:-1]

   306 Out[30]: False

   307 \end{lstlisting}

   308 Explain last result

   309 \end{frame}

   310 

   311 \begin{frame}[fragile]

   312   \frametitle{List: more slices}

   313 \begin{lstlisting}

   314 In [31]: lst[0:-1:2] # Notice the step!

   315 Out[31]: [1, 3]

   316 

   317 In [31]: lst[::2]

   318 Out[31]: [1, 3]

   319 

   320 In [32]: lst[-1::-1]

   321 \end{lstlisting}

   322 What do you think the last one will do?

   323 \end{frame}

   324 

   325 \begin{frame}[fragile]

   326   \frametitle{List methods}

   327 \begin{lstlisting}

   328 In [33]: lst.append(5)

   329 

   330 In [34]: lst

   331 Out[34]: [1, 2, 3, 4, 5]

   332 

   333 In [35]: lst.append([6,7])

   334 

   335 In [36]: lst

   336 Out[36]: [1, 2, 3, 4, 5, [6, 7]]

   337 

   338 In [37]: lst.extend([8,9])

   339 

   340 In [38]: lst

   341 Out[38]: [1, 2, 3, 4, 5, [6, 7], 8, 9]

   342 \end{lstlisting}

   343 \end{frame}

   344 

   345 \begin{frame}[fragile]

   346   \frametitle{List containership}

   347   \begin{lstlisting}

   348 In [39]: animals = ['cat', 'dog', 'rat', 'croc']

   349 

   350 In [40]: 'dog' in animals

   351 Out[40]: True

   352 

   353 In [41]: 'snake' in animals

   354 Out[41]: False

   355   \end{lstlisting}

   356   \inctime{10}

   357 \end{frame}

   358 

   359 \section{Modules and import}

   360 \begin{frame}{Modules and \typ{import}}

   361   \begin{itemize}

   362     \item \kwrd{import} x

   363     \item \kwrd{from} x \kwrd{import} y

   364   \end{itemize}

   365 Whats the difference??

   366 \inctime{5}

   367 \end{frame}

   368 

   369 \end{document}