using python modules/slides.tex
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% Created 2010-10-12 Tue 17:12
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\documentclass[presentation]{beamer}
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\usepackage[latin1]{inputenc}
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\usepackage[T1]{fontenc}
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\usepackage{fixltx2e}
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\usepackage{graphicx}
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\usepackage{longtable}
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\usepackage{float}
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\usepackage{wrapfig}
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\usepackage{soul}
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\usepackage{t1enc}
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\usepackage{textcomp}
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\usepackage{marvosym}
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\usepackage{wasysym}
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\usepackage{latexsym}
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\usepackage{amssymb}
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\usepackage{hyperref}
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\tolerance=1000
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\usepackage[english]{babel} \usepackage{ae,aecompl}
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\usepackage{mathpazo,courier,euler} \usepackage[scaled=.95]{helvet}
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\usepackage{listings}
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\lstset{language=Python, basicstyle=\ttfamily\bfseries,
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commentstyle=\color{red}\itshape, stringstyle=\color{darkgreen},
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showstringspaces=false, keywordstyle=\color{blue}\bfseries}
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\providecommand{\alert}[1]{\textbf{#1}}
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\title{Using python modules}
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\author{FOSSEE}
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\date{}
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\usetheme{Warsaw}\usecolortheme{default}\useoutertheme{infolines}\setbeamercovered{transparent}
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\begin{document}
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\maketitle
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\begin{frame}
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\frametitle{Outline}
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\label{sec-1}
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\begin{itemize}
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\item Running python scripts from command line
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\item Importing python modules
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\item Importing scipy \& pylab modules
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\item About python standard library.
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\end{itemize}
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\end{frame}
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\begin{frame}[fragile]
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\frametitle{Running Python script from command line}
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\label{sec-2}
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\begin{itemize}
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\item Create a script, open text editor and type the following
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\begin{verbatim}
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     print "hello world!"
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     print
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\end{verbatim}
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\item Save the script as \texttt{hello.py}
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\end{itemize}
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\end{frame}
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\begin{frame}[fragile]
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\frametitle{Running Python script from command line (cont'd)}
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\label{sec-3}
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\begin{itemize}
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\item Run the script
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\begin{verbatim}
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     $ python hello.py
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\end{verbatim}
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\end{itemize}
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  \emph{Syntax :} \textbf{python filename}
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\end{frame}
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\begin{frame}
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\frametitle{Four plot problem}
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\label{sec-4}
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    \begin{center}
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      \includegraphics[scale=0.4]{four_plot}    
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    \end{center}
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\end{frame}
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\begin{frame}[fragile]
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\frametitle{Fix \texttt{linspace()} problem}
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\label{sec-5}
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\begin{verbatim}
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   from scipy import *
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\end{verbatim}
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\end{frame}
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\begin{frame}[fragile]
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\frametitle{Fix \texttt{plot()} problem}
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\label{sec-6}
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\begin{verbatim}
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   from pylab import *
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\end{verbatim}
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\end{frame}
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\begin{frame}[fragile]
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\frametitle{Better way of fixing}
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\label{sec-7}
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\begin{verbatim}
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   from scipy import linspace
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\end{verbatim}
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  instead of
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\begin{verbatim}
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   from scipy import *
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\end{verbatim}
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    \texttt{*} means import all functions from name-space \texttt{scipy}.
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\end{frame}
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\begin{frame}[fragile]
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\frametitle{Instead of \texttt{*}}
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\label{sec-8}
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\begin{verbatim}
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    from scipy import linspace, pi, sin
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    from pylab import plot, legend, annotate
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    from pylab import xlim, ylim, title, show
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\end{verbatim}
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  Is better than, \texttt{from scipy import *} \& \texttt{from pylab import *}.
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\end{frame}
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\begin{frame}[fragile]
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\frametitle{Another Fix}
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\label{sec-9}
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\begin{verbatim}
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import scipy
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import pylab
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x = scipy.linspace(-5*scipy.pi, 5*scipy.pi, 500)
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pylab.plot(x, x, 'b')
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pylab.plot(x, -x, 'b')
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pylab.plot(x, scipy.sin(x), 'g', linewidth=2)
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pylab.plot(x, x*scipy.sin(x), 'r', linewidth=3)
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pylab.legend(['x', '-x', 'sin(x)', 'xsin(x)'])
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pylab.annotate('origin', xy = (0, 0))
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pylab.xlim(-5*scipy.pi, 5*scipy.pi)
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pylab.ylim(-5*scipy.pi, 5*scipy.pi)
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\end{verbatim}
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\end{frame}
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\begin{frame}
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\frametitle{Exercise 1}
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\label{sec-10}
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  Write a python script to plot a sine wave from 
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    $-2\Pi$
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  to 
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    $2\Pi$
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  .
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\end{frame}
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\begin{frame}
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\frametitle{What is a module?}
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\label{sec-11}
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  Module is simply a file containing Python definitions and
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  statements. Definitions from a module can be imported into other
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  modules or into the main module.
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\end{frame}
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\begin{frame}
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\frametitle{Python standard library}
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\label{sec-12}
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  Python has a very rich standard library of modules.
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\begin{itemize}
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\item Few libraries
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\begin{itemize}
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\item Math: \texttt{math}, \texttt{random}
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\item Internet access: \texttt{urllib2}, \texttt{smtplib}
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\item System, Command line arguments: \texttt{sys}
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\item Operating system interface: \texttt{os}
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\item regular expressions: \texttt{re}
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\item compression: \texttt{gzip}, \texttt{zipfile}, \texttt{tarfile}
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\end{itemize}
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\item More information
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\begin{itemize}
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\item \href{http://docs.python.org/library}{http://docs.python.org/library}
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\end{itemize}
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\end{itemize}
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\end{frame}
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\begin{frame}
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\frametitle{Summary}
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\label{sec-13}
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\begin{itemize}
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\item Running scripts from command line
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\item Learned about modules
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\begin{itemize}
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\item importing modules
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\end{itemize}
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\item Python standard library
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\end{itemize}
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\end{frame}
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\begin{frame}
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\frametitle{Thank you!}
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\label{sec-14}
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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{frame}
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\end{document}