% Created 2010-10-12 Tue 12:55

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\usepackage{listings}

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

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

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

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

\title{Getting started with for}

\author{FOSSEE}

\date{}

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

\begin{document}

\maketitle

\begin{frame}

\frametitle{Outline}

\label{sec-1}

\begin{itemize}

\item \texttt{for} loop in Python.

\item Blocks of code in Python.

\begin{itemize}

\item Indentation

\end{itemize}

\end{itemize}

\end{frame}

\begin{frame}[fragile]

\frametitle{Whitespace in Python}

\label{sec-2}

\begin{itemize}

\item Whitespace is significant

\begin{itemize}

\item blocks are visually separated

\end{itemize}

\item Blocks are indented using 4 spaces

\begin{verbatim}

     Block A

     Block A

         Block B

         Block B

     Block A

\end{verbatim}

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

\end{itemize}

\end{frame}

\begin{frame}[fragile]

\frametitle{Exercise 1}

\label{sec-3}

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

  the square root of each number.

\begin{verbatim}

\end{verbatim}

  The numbers are,

\begin{verbatim}

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

   576, 2916

\end{verbatim}

\end{frame}

\begin{frame}[fragile]

\frametitle{Solution 1}

\label{sec-4}

\begin{itemize}

\item Open text editor and type the following code

\end{itemize}

\begin{verbatim}

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

           576, 2916]

for each in numbers:

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

print "This is not in for loop!"

\end{verbatim}

\end{frame}

\begin{frame}[fragile]

\frametitle{Save \& run script}

\label{sec-5}

\begin{itemize}

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

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

\begin{verbatim}

     In []: %run -i list_roots.py

\end{verbatim}

\end{itemize}

\end{frame}

\begin{frame}[fragile]

\frametitle{Exercise 2}

\label{sec-6}

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

\begin{verbatim}

\end{verbatim}

  The numbers are,

\begin{verbatim}

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

   7056, 576, 2916

\end{verbatim}

\end{frame}

\begin{frame}[fragile]

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

\label{sec-7}

  Print the square root of numbers in the list.

\begin{verbatim}

\end{verbatim}

  Numbers are,

\begin{verbatim}

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

   7056, 576, 2916

\end{verbatim}

\end{frame}

\begin{frame}[fragile]

\frametitle{Indentation in \texttt{ipython}}

\label{sec-8}

\begin{verbatim}

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

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

\end{verbatim}

\begin{verbatim}

   In []: for each in numbers:

     ...:     

\end{verbatim}

  Note the four spaces here

\begin{verbatim}

\end{verbatim}

\end{frame}

\begin{frame}[fragile]

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

\label{sec-9}

\begin{verbatim}

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

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

   In []: for each in numbers:

     ...:     

\end{verbatim}

  Note the four spaces here

\begin{verbatim}

\end{verbatim}

  Now type the rest of the code

\begin{verbatim}

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

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

     ...:     

     ...:     

\end{verbatim}

\end{frame}

\begin{frame}[fragile]

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

\label{sec-10}

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

\begin{verbatim}

\end{verbatim}

  \emph{do it in the python interpreter}

\end{frame}

\begin{frame}[fragile]

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

\label{sec-11}

\begin{verbatim}

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

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

...

\end{verbatim}

\end{frame}

\begin{frame}

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

\label{sec-12}

\begin{itemize}

\item in built function in Python

\item generates a list of integers

\begin{itemize}

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

\item \emph{example:}

\begin{itemize}

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

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

\end{itemize}

\end{itemize}

\end{itemize}

\end{frame}

\begin{frame}

\frametitle{Exercise 4}

\label{sec-13}

  Print all the odd numbers from 1 to 50.

\end{frame}

\begin{frame}

\frametitle{Summary}

\label{sec-14}

\begin{itemize}

\item blocks in \texttt{python}

\item indentation

\item blocks in \texttt{ipython} interpreter

\item \texttt{for} loop

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

\item \texttt{range()} function

\end{itemize}

\end{frame}

\begin{frame}

\frametitle{Thank you!}

\label{sec-15}

  \begin{block}{}

  \begin{center}

  This spoken tutorial has been produced by the

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

  \end{center}

  \begin{center}

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

      Information \& Communication Technology \\ 

      MHRD, Govt. of India}.

  \end{center}  

  \end{block}

\end{frame}

\end{document}