1 % Created 2010-10-12 Tue 12:55

     2 \documentclass[presentation]{beamer}

     3 \usepackage[latin1]{inputenc}

     4 \usepackage[T1]{fontenc}

     5 \usepackage{fixltx2e}

     6 \usepackage{graphicx}

     7 \usepackage{longtable}

     8 \usepackage{float}

     9 \usepackage{wrapfig}

    10 \usepackage{soul}

    11 \usepackage{t1enc}

    12 \usepackage{textcomp}

    13 \usepackage{marvosym}

    14 \usepackage{wasysym}

    15 \usepackage{latexsym}

    16 \usepackage{amssymb}

    17 \usepackage{hyperref}

    18 \tolerance=1000

    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{Getting started with for}

    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 \texttt{for} loop in Python.

    50 \item Blocks of code in Python.

    51 

    52 \begin{itemize}

    53 \item Indentation

    54 \end{itemize}

    55 

    56 \end{itemize}

    57 \end{frame}

    58 \begin{frame}[fragile]

    59 \frametitle{Whitespace in Python}

    60 \label{sec-2}

    61 

    62 \begin{itemize}

    63 \item Whitespace is significant

    64 

    65 \begin{itemize}

    66 \item blocks are visually separated

    67 \end{itemize}

    68 

    69 \item Blocks are indented using 4 spaces

    70 \begin{verbatim}

    71      Block A

    72      Block A

    73          Block B

    74          Block B

    75      Block A

    76 \end{verbatim}

    77 

    78     \texttt{Block B} is an inner block and is indented using 4 spaces

    79 \end{itemize}

    80 \end{frame}

    81 \begin{frame}[fragile]

    82 \frametitle{Exercise 1}

    83 \label{sec-3}

    84 

    85   Write a \texttt{for} loop which iterates through a list of numbers and find

    86   the square root of each number.

    87 \begin{verbatim}

    88    

    89 \end{verbatim}

    90 

    91   The numbers are,

    92 \begin{verbatim}

    93    1369, 7225, 3364, 7056, 5625, 729, 7056, 

    94    576, 2916

    95 \end{verbatim}

    96 \end{frame}

    97 \begin{frame}[fragile]

    98 \frametitle{Solution 1}

    99 \label{sec-4}

   100 

   101 \begin{itemize}

   102 \item Open text editor and type the following code

   103 \end{itemize}

   104 

   105 \begin{verbatim}

   106 numbers = [1369, 7225, 3364, 7056, 5625, 729, 7056, 

   107            576, 2916]

   108 

   109 for each in numbers:

   110     print "Square root of", each, "is", sqrt(each)

   111 

   112 print "This is not in for loop!"

   113 \end{verbatim}

   114 \end{frame}

   115 \begin{frame}[fragile]

   116 \frametitle{Save \& run script}

   117 \label{sec-5}

   118 

   119 \begin{itemize}

   120 \item Save the script as \texttt{list\_roots.py}

   121 \item Run in \texttt{ipython} interpreter as,

   122 \begin{verbatim}

   123      In []: %run -i list_roots.py

   124 \end{verbatim}

   125 

   126 \end{itemize}

   127 \end{frame}

   128 \begin{frame}[fragile]

   129 \frametitle{Exercise 2}

   130 \label{sec-6}

   131 

   132   From the given numbers make a list of perfect squares and a list of those which are not.

   133 \begin{verbatim}

   134    

   135 \end{verbatim}

   136 

   137   The numbers are,

   138 \begin{verbatim}

   139    7225, 3268, 3364, 2966, 7056, 5625, 729, 5547, 

   140    7056, 576, 2916

   141 \end{verbatim}

   142 \end{frame}

   143 \begin{frame}[fragile]

   144 \frametitle{Exercise 3 (indentation in \texttt{ipython})}

   145 \label{sec-7}

   146 

   147   Print the square root of numbers in the list.

   148 \begin{verbatim}

   149    

   150 \end{verbatim}

   151 

   152   Numbers are,

   153 \begin{verbatim}

   154    7225, 3268, 3364, 2966, 7056, 5625, 729, 5547, 

   155    7056, 576, 2916

   156 \end{verbatim}

   157 \end{frame}

   158 \begin{frame}[fragile]

   159 \frametitle{Indentation in \texttt{ipython}}

   160 \label{sec-8}

   161 

   162 \begin{verbatim}

   163    In []: numbers = [1369, 7225, 3364, 7056, 5625, 

   164      ...:  729, 7056, 576, 2916]

   165 \end{verbatim}

   166 

   167 

   168 \begin{verbatim}

   169    In []: for each in numbers:

   170      ...:     

   171 \end{verbatim}

   172 

   173   Note the four spaces here

   174 \begin{verbatim}

   175    

   176    

   177    

   178    

   179    

   180    

   181 \end{verbatim}

   182 \end{frame}

   183 \begin{frame}[fragile]

   184 \frametitle{Indentation in \texttt{ipython} (cont'd)}

   185 \label{sec-9}

   186 

   187 \begin{verbatim}

   188    In []: numbers = [1369, 7225, 3364, 7056, 5625, 

   189      ...:  729, 7056, 576, 2916]

   190    In []: for each in numbers:

   191      ...:     

   192 \end{verbatim}

   193 

   194   Note the four spaces here

   195 \begin{verbatim}

   196    

   197 \end{verbatim}

   198 

   199   Now type the rest of the code

   200 \begin{verbatim}

   201      ...:     print "Square root of", each, 

   202      ...:     print "is", sqrt(each)

   203      ...:     

   204      ...:     

   205 \end{verbatim}

   206 \end{frame}

   207 \begin{frame}[fragile]

   208 \frametitle{Indentation in \texttt{python} interpreter}

   209 \label{sec-10}

   210 

   211   Find out the cube of all the numbers from 1 to 10.

   212 \begin{verbatim}

   213    

   214 \end{verbatim}

   215 

   216   \emph{do it in the python interpreter}

   217 \end{frame}

   218 \begin{frame}[fragile]

   219 \frametitle{Indentation in \texttt{python} interpreter (cont'd)}

   220 \label{sec-11}

   221 

   222 \begin{verbatim}

   223 >>> for i in range(1, 11):

   224 ...     print i, "cube is", i**3

   225 ...

   226 \end{verbatim}

   227 \end{frame}

   228 \begin{frame}

   229 \frametitle{\texttt{range()} function}

   230 \label{sec-12}

   231 

   232 \begin{itemize}

   233 \item in built function in Python

   234 \item generates a list of integers

   235 

   236 \begin{itemize}

   237 \item \emph{syntax:} range([start,] stop[, step])

   238 \item \emph{example:}

   239 

   240 \begin{itemize}

   241 \item range(1, 20) - \emph{generates integers from 1 to 20}

   242 \item range(20) - \emph{generates integers from 0 to 20}

   243 \end{itemize}

   244 

   245 \end{itemize}

   246 

   247 \end{itemize}

   248 \end{frame}

   249 \begin{frame}

   250 \frametitle{Exercise 4}

   251 \label{sec-13}

   252 

   253   Print all the odd numbers from 1 to 50.

   254 \end{frame}

   255 \begin{frame}

   256 \frametitle{Summary}

   257 \label{sec-14}

   258 

   259 \begin{itemize}

   260 \item blocks in \texttt{python}

   261 \item indentation

   262 \item blocks in \texttt{ipython} interpreter

   263 \item \texttt{for} loop

   264 \item iterating over list using \texttt{for} loop

   265 \item \texttt{range()} function

   266 \end{itemize}

   267 \end{frame}

   268 \begin{frame}

   269 \frametitle{Thank you!}

   270 \label{sec-15}

   271 

   272   \begin{block}{}

   273   \begin{center}

   274   This spoken tutorial has been produced by the

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

   276   \end{center}

   277   \begin{center}

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

   279       Information \& Communication Technology \\ 

   280       MHRD, Govt. of India}.

   281   \end{center}  

   282   \end{block}

   283 \end{frame}

   284 

   285 \end{document}