\documentclass[12pt]{article}

\title{Python: Data Structures}

\author{FOSSEE}

\usepackage{listings}

\lstset{language=Python,

    basicstyle=\ttfamily,

commentstyle=\itshape\bfseries, 

showstringspaces=false

}

\newcommand{\typ}[1]{\lstinline{#1}}

\usepackage[english]{babel}

\usepackage[latin1]{inputenc}

\usepackage{times}

\usepackage[T1]{fontenc}

\usepackage{ae,aecompl}

\usepackage{mathpazo,courier,euler}

\usepackage[scaled=.95]{helvet}

\begin{document}

\date{}

\vspace{-1in}

\begin{center}

\LARGE{Python: Functions and Objects}\\

\large{FOSSEE}

\end{center}

\section{Functions}

Function definition

  \begin{lstlisting}

def signum( r ):    

    if r < 0:

        return -1

    elif r > 0:

        return 1

    else:

        return 0

  \end{lstlisting}

Default Arguments 

\begin{lstlisting}

def welcome(greet, name='world!'):

    print greet, name

\end{lstlisting}

Keyword Arguments

\begin{lstlisting}

In []: plot(y, sin(y), 'g', linewidth=2)

\end{lstlisting}

Self contained python script

  \begin{lstlisting}

from scipy import linspace, pi, sin

from pylab import plot, legend, annotate

from pylab import xlim, ylim

x = linspace(-5*pi, 5*pi, 500)

plot(x, x, 'b')

plot(x, -x, 'b')

plot(x, sin(x), 'g', linewidth=2)

plot(x, x*sin(x), 'r', linewidth=3)

legend(['x', '-x', 'sin(x)', 'xsin(x)'])

annotate('origin', xy = (0, 0))

xlim(-5*pi, 5*pi)

ylim(-5*pi, 5*pi)

  \end{lstlisting}

\end{document}