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%Tutorial slides on Python.

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% Taken from Fernando's slides.

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\usepackage[scaled=.95]{helvet}

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\usepackage{listings}

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% Title page

\title[Basic Python]{Python language: Data structures and functions}

\author[FOSSEE Team] {The FOSSEE Group}

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

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

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

%% the beginning of each subsection:

\AtBeginSubsection[]

{

  \begin{frame}<beamer>

    \frametitle{Outline}

    \tableofcontents[currentsection,currentsubsection]

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  \begin{frame}<beamer>

    \frametitle{Outline}

    \tableofcontents[currentsection,currentsubsection]

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% DOCUMENT STARTS

\begin{document}

\begin{frame}

  \titlepage

\end{frame}

\begin{frame}

  \frametitle{Outline}

  \tableofcontents

  % You might wish to add the option [pausesections]

\end{frame}

\section{Data structures}

\subsection{Lists}

\begin{frame}[fragile]

  \frametitle{Lists}

\begin{block}{We already know that}

  \begin{lstlisting}

  \end{lstlisting}

\centerline{is a list}

\end{block}

\end{frame}

\begin{frame}[fragile]

  \frametitle{Lists: methods}

  \begin{lstlisting}

In []: num.reverse()

In []: num

In []: num

\end{frame}

\begin{frame}[fragile]

\frametitle{List containership}

\begin{lstlisting}

Out[]: True

In []: b in num

Out[]: False

In []: b not in num

Out[]: True

\end{lstlisting}

\end{frame}

\subsection{Tuples}

\begin{frame}[fragile]

\frametitle{Tuples: Immutable lists}

\begin{lstlisting}

In []: t = (1, 2, 3, 4, 5, 6, 7, 8)

In []: t[0] + t[3] + t[-1]

Out[]: 13

\end{lstlisting}

\begin{block}{Note:}

\begin{itemize}

  \item Tuples are immutable - cannot be changed

\end{itemize}

\end{block}

  \inctime{10}

\end{frame}

\begin{frame}

  {A classic problem}

  \begin{block}

    {Interchange values}

    How to interchange values of two variables? 

  \end{block}

  \pause

  \begin{block}{Note:}

    This Python idiom works for all types of variables.\\

They need not be of the same type!

  \end{block}

\end{frame}

\subsection{Dictionaries}

\begin{frame}[fragile]

  \begin{lstlisting}

In []: player = {'Mat': 134,'Inn': 233,

          'Runs': 10823, 'Avg': 52.53}

In []: player['Avg']

Out[]: 52.530000000000001

  \end{lstlisting}

  \begin{block}{Note!}

    Duplicate keys are not allowed!\\

    Dictionaries are iterable through keys.

  \end{block}

\end{frame}

\begin{frame} {Problem Set 2.1: Problem 2.1.1}

You are given date strings of the form ``29, Jul 2009'', or ``4 January 2008''. In other words a number, a string and another number, with a comma sometimes separating the items.\\Write a function that takes such a string and returns a tuple (yyyy, mm, dd) where all three elements are ints.

\end{frame}

\subsection{Set}

\begin{frame}[fragile]

  \frametitle{Set}

    \begin{itemize}

      \item Simplest container, mutable

      \item No ordering, no duplicates

      \item usual suspects: union, intersection, subset \ldots

      \item >, >=, <, <=, in, \ldots

    \end{itemize}

    \begin{lstlisting}

\end{lstlisting}

\end{frame}

\begin{frame}[fragile]

    \begin{lstlisting}

\end{lstlisting}

\end{frame}

\begin{frame}

  \frametitle{Problem set 2.2}

  \begin{description}

    \item[2.2.1] Given a dictionary of the names of students and their marks, identify how many duplicate marks are there? and what are these?

\end{description}

\inctime{15}

\end{frame}

\section{Functions}

\begin{frame}[fragile]

  \frametitle{Functions}

  \begin{itemize}

    \item \kwrd{def} - keyword to define a function

    \item Arguments are local to a function

    \item Docstrings are important!

    \item Functions can return multiple values

  \end{itemize}

\end{frame}

\begin{frame}[fragile]

  \frametitle{Functions: example}

  \begin{lstlisting}

def signum( r ):

    """returns 0 if r is zero

    -1 if r is negative

    +1 if r is positive"""

    if r < 0:

        return -1

    elif r > 0:

        return 1

    else:

        return 0

  \end{lstlisting}

\end{frame}

\begin{frame}[fragile]

  {What does this function do?}

\begin{lstlisting}

def what( n ):

    i = 1