1 % Created 2010-10-12 Tue 17:12

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    19 \usepackage[english]{babel} \usepackage{ae,aecompl}

    20 \usepackage{mathpazo,courier,euler} \usepackage[scaled=.95]{helvet}

    21 \usepackage{listings}

    22 \lstset{language=Python, basicstyle=\ttfamily\bfseries,

    23 commentstyle=\color{red}\itshape, stringstyle=\color{darkgreen},

    24 showstringspaces=false, keywordstyle=\color{blue}\bfseries}

    25 \providecommand{\alert}[1]{\textbf{#1}}

    26 

    27 \title{Using python modules}

    28 \author{FOSSEE}

    29 \date{}

    30 

    31 \usetheme{Warsaw}\usecolortheme{default}\useoutertheme{infolines}\setbeamercovered{transparent}

    32 \begin{document}

    33 

    34 \maketitle

    35 

    36 

    37 

    38 

    39 

    40 

    41 

    42 

    43 

    44 \begin{frame}

    45 \frametitle{Outline}

    46 \label{sec-1}

    47 

    48 \begin{itemize}

    49 \item Running python scripts from command line

    50 \item Importing python modules

    51 \item Importing scipy \& pylab modules

    52 \item About python standard library.

    53 \end{itemize}

    54 \end{frame}

    55 \begin{frame}[fragile]

    56 \frametitle{Running Python script from command line}

    57 \label{sec-2}

    58 

    59 \begin{itemize}

    60 \item Create a script, open text editor and type the following

    61 \begin{verbatim}

    62      print "hello world!"

    63      print

    64 \end{verbatim}

    65 

    66 \item Save the script as \texttt{hello.py}

    67 \end{itemize}

    68 \end{frame}

    69 \begin{frame}[fragile]

    70 \frametitle{Running Python script from command line (cont'd)}

    71 \label{sec-3}

    72 

    73 \begin{itemize}

    74 \item Run the script

    75 \begin{verbatim}

    76      $ python hello.py

    77 \end{verbatim}

    78 

    79 \end{itemize}

    80 

    81   \emph{Syntax :} \textbf{python filename}

    82 \end{frame}

    83 \begin{frame}

    84 \frametitle{Four plot problem}

    85 \label{sec-4}

    86 

    87     \begin{center}

    88       \includegraphics[scale=0.4]{four_plot}    

    89     \end{center}

    90 \end{frame}

    91 \begin{frame}[fragile]

    92 \frametitle{Fix \texttt{linspace()} problem}

    93 \label{sec-5}

    94 

    95 \begin{verbatim}

    96    from scipy import *

    97 \end{verbatim}

    98 \end{frame}

    99 \begin{frame}[fragile]

   100 \frametitle{Fix \texttt{plot()} problem}

   101 \label{sec-6}

   102 

   103 \begin{verbatim}

   104    from pylab import *

   105 \end{verbatim}

   106 \end{frame}

   107 \begin{frame}[fragile]

   108 \frametitle{Better way of fixing}

   109 \label{sec-7}

   110 

   111 \begin{verbatim}

   112    from scipy import linspace

   113 \end{verbatim}

   114 

   115   instead of

   116 \begin{verbatim}

   117    from scipy import *

   118 \end{verbatim}

   119 

   120     \texttt{*} means import all functions from name-space \texttt{scipy}.

   121 \end{frame}

   122 \begin{frame}[fragile]

   123 \frametitle{Instead of \texttt{*}}

   124 \label{sec-8}

   125 

   126 \begin{verbatim}

   127     from scipy import linspace, pi, sin

   128     from pylab import plot, legend, annotate

   129     from pylab import xlim, ylim, title, show

   130 \end{verbatim}

   131 

   132   Is better than, \texttt{from scipy import *} \& \texttt{from pylab import *}.

   133 \end{frame}

   134 \begin{frame}[fragile]

   135 \frametitle{Another Fix}

   136 \label{sec-9}

   137 

   138 \begin{verbatim}

   139 import scipy

   140 import pylab

   141 x = scipy.linspace(-5*scipy.pi, 5*scipy.pi, 500)

   142 pylab.plot(x, x, 'b')

   143 pylab.plot(x, -x, 'b')

   144 pylab.plot(x, scipy.sin(x), 'g', linewidth=2)

   145 pylab.plot(x, x*scipy.sin(x), 'r', linewidth=3)

   146 pylab.legend(['x', '-x', 'sin(x)', 'xsin(x)'])

   147 pylab.annotate('origin', xy = (0, 0))

   148 pylab.xlim(-5*scipy.pi, 5*scipy.pi)

   149 pylab.ylim(-5*scipy.pi, 5*scipy.pi)

   150 \end{verbatim}

   151 \end{frame}

   152 \begin{frame}

   153 \frametitle{Exercise 1}

   154 \label{sec-10}

   155 

   156   Write a python script to plot a sine wave from 

   157     $-2\Pi$

   158   to 

   159     $2\Pi$

   160   .

   161 \end{frame}

   162 \begin{frame}

   163 \frametitle{What is a module?}

   164 \label{sec-11}

   165 

   166   Module is simply a file containing Python definitions and

   167   statements. Definitions from a module can be imported into other

   168   modules or into the main module.

   169 \end{frame}

   170 \begin{frame}

   171 \frametitle{Python standard library}

   172 \label{sec-12}

   173 

   174   Python has a very rich standard library of modules.

   175 \begin{itemize}

   176 \item Few libraries

   177 

   178 \begin{itemize}

   179 \item Math: \texttt{math}, \texttt{random}

   180 \item Internet access: \texttt{urllib2}, \texttt{smtplib}

   181 \item System, Command line arguments: \texttt{sys}

   182 \item Operating system interface: \texttt{os}

   183 \item regular expressions: \texttt{re}

   184 \item compression: \texttt{gzip}, \texttt{zipfile}, \texttt{tarfile}

   185 \end{itemize}

   186 

   187 \item More information

   188 

   189 \begin{itemize}

   190 \item \href{http://docs.python.org/library}{http://docs.python.org/library}

   191 \end{itemize}

   192 

   193 \end{itemize}

   194 \end{frame}

   195 \begin{frame}

   196 \frametitle{Summary}

   197 \label{sec-13}

   198 

   199 \begin{itemize}

   200 \item Running scripts from command line

   201 \item Learned about modules

   202 

   203 \begin{itemize}

   204 \item importing modules

   205 \end{itemize}

   206 

   207 \item Python standard library

   208 \end{itemize}

   209 \end{frame}

   210 \begin{frame}

   211 \frametitle{Thank you!}

   212 \label{sec-14}

   213 

   214   \begin{block}{}

   215   \begin{center}

   216   This spoken tutorial has been produced by the

   217   \textcolor{blue}{FOSSEE} team, which is funded by the 

   218   \end{center}

   219   \begin{center}

   220     \textcolor{blue}{National Mission on Education through \\

   221       Information \& Communication Technology \\ 

   222       MHRD, Govt. of India}.

   223   \end{center}  

   224   \end{block}

   225 \end{frame}

   226 

   227 \end{document}