\documentclass[12pt]{article}

\title{Python: Basics}

\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: Basics}\\

\large{FOSSEE}

\end{center}

\section{Data types}

Complex Numbers

\begin{lstlisting}

In []: c = 3+4j

In []: abs(c)

Out[]: 5.0

In []: c.imag

Out[]: 4.0

In []: c.real

Out[]: 3.0

\end{lstlisting}

Boolean

\begin{lstlisting}     

In []: a = False

In []: b = True

In []: c = True

In []: (a and b) or c

Out[]: True

\end{lstlisting}

Strings

  \begin{lstlisting}

In []: w = "hello"

In []: print w[0] + w[2] + w[-1]

Out[]: hlo

In []: len(w)

Out[]: 5

In []: w[0] = 'H' # ERROR: Strings are immutable 

  \end{lstlisting}

String methods

  \begin{lstlisting}

In []: a = 'Hello World' 

In []: a.startswith('Hell') # 'a' starts with 'Hell'

In []: a.endswith('ld') # 'a' ends with 'ld'

In []: a.upper() # all characters to upper case

In []: a.lower() # all characters to lower case

In []: ''.join(['a', 'b', 'c'])

Out[]: 'abc'

  \end{lstlisting}

String formatting

  \begin{lstlisting}

In []: x, y = 1, 1.234

In []: 'x is %s, y is %s' %(x, y)

Out[]: 'x is 1, y is 1.234'

  \end{lstlisting}

Arithmetic Operators

  \begin{lstlisting}

In []: 45 % 2 # Modulo operator

Out[]: 1

In []: 1234567891234567890 ** 3 # Power

In []: a = 5

In []: a += 1

In []: a *= 2

  \end{lstlisting}

String Operations

\begin{lstlisting}

In []: s = 'Hello'

In []: p = 'World'

In []: s + p 

Out[]: 'HelloWorld'

In []: s * 4

Out[]: 'HelloHelloHelloHello'

\end{lstlisting}

Relational and Logical Operators

\begin{lstlisting}

In []: p, z, n = 1, 0, -1

In []: p == n

Out[]: False

In []: p >= n

Out[]: True

In []: n < z < p

Out[]: True

In []: p + n != z

Out[]: False

\end{lstlisting}

Built-ins

\begin{lstlisting}

In []: int(17 / 2.0)

Out[]: 8

In []: float(17 / 2)

Out[]: 8.0

In []: str(17 / 2.0)

Out[]: '8.5'

In []: round( 7.5 )

Out[]: 8.0

\end{lstlisting}

Console Input

\begin{lstlisting}

In []: a = raw_input('Enter a value: ')

Enter a value: 5

\end{lstlisting}

\section{Conditionals}

\typ{if}

\begin{lstlisting}

In []: x = int(raw_input("Enter an integer:"))

In []: if x < 0:

  ...:     print 'Be positive!'

  ...: elif x == 0:

  ...:     print 'Zero'

  ...: elif x == 1:

  ...:     print 'Single'

  ...: else:

  ...:     print 'More'

\end{lstlisting}

Ternary Operator

\begin{lstlisting}

In []: a = raw_input('Enter number(Q to quit):')

In []: num = int(a) if a != 'Q' else 0

\end{lstlisting}

\end{document}