1 \documentclass[12pt]{article}

     2 

     3 

     4 \title{Python: Basics}

     5 \author{FOSSEE}

     6 \usepackage{listings}

     7 \lstset{language=Python,

     8     basicstyle=\ttfamily,

     9 commentstyle=\itshape\bfseries, 

    10 showstringspaces=false

    11 }

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

    13 \usepackage[english]{babel}

    14 \usepackage[latin1]{inputenc}

    15 \usepackage{times}

    16 \usepackage[T1]{fontenc}

    17 \usepackage{ae,aecompl}

    18 \usepackage{mathpazo,courier,euler}

    19 \usepackage[scaled=.95]{helvet}

    20 

    21 \begin{document}

    22 \date{}

    23 \vspace{-1in}

    24 \begin{center}

    25 \LARGE{Python: Basics}\\

    26 \large{FOSSEE}

    27 \end{center}

    28 \section{Data types}

    29 Complex Numbers

    30 \begin{lstlisting}

    31 In []: c = 3+4j

    32 In []: abs(c)

    33 Out[]: 5.0

    34 In []: c.imag

    35 Out[]: 4.0

    36 In []: c.real

    37 Out[]: 3.0

    38 \end{lstlisting}

    39 Boolean

    40 \begin{lstlisting}     

    41 In []: a = False

    42 In []: b = True

    43 In []: c = True

    44 In []: (a and b) or c

    45 Out[]: True

    46 \end{lstlisting}

    47 Strings

    48   \begin{lstlisting}

    49 In []: w = "hello"

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

    51 Out[]: hlo

    52 In []: len(w)

    53 Out[]: 5

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

    55   \end{lstlisting}

    56 String methods

    57   \begin{lstlisting}

    58 In []: a = 'Hello World' 

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

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

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

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

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

    64 Out[]: 'abc'

    65   \end{lstlisting}

    66 String formatting

    67   \begin{lstlisting}

    68 In []: x, y = 1, 1.234

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

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

    71   \end{lstlisting}

    72 Arithmetic Operators

    73   \begin{lstlisting}

    74 In []: 45 % 2 # Modulo operator

    75 Out[]: 1

    76 In []: 1234567891234567890 ** 3 # Power

    77 In []: a = 5

    78 In []: a += 1

    79 In []: a *= 2

    80   \end{lstlisting}

    81 String Operations

    82 \begin{lstlisting}

    83 In []: s = 'Hello'

    84 In []: p = 'World'

    85 In []: s + p 

    86 Out[]: 'HelloWorld'

    87 In []: s * 4

    88 Out[]: 'HelloHelloHelloHello'

    89 \end{lstlisting}

    90 Relational and Logical Operators

    91 \begin{lstlisting}

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

    93 In []: p == n

    94 Out[]: False

    95 In []: p >= n

    96 Out[]: True

    97 In []: n < z < p

    98 Out[]: True

    99 In []: p + n != z

   100 Out[]: False

   101 \end{lstlisting}

   102 Built-ins

   103 \begin{lstlisting}

   104 In []: int(17 / 2.0)

   105 Out[]: 8

   106 In []: float(17 / 2)

   107 Out[]: 8.0

   108 In []: str(17 / 2.0)

   109 Out[]: '8.5'

   110 In []: round( 7.5 )

   111 Out[]: 8.0

   112 \end{lstlisting}

   113 Console Input

   114 \begin{lstlisting}

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

   116 Enter a value: 5

   117 \end{lstlisting}

   118 \section{Conditionals}

   119 \typ{if}

   120 \begin{lstlisting}

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

   122 In []: if x < 0:

   123   ...:     print 'Be positive!'

   124   ...: elif x == 0:

   125   ...:     print 'Zero'

   126   ...: elif x == 1:

   127   ...:     print 'Single'

   128   ...: else:

   129   ...:     print 'More'

   130 \end{lstlisting}

   131 Ternary Operator

   132 \begin{lstlisting}

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

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

   135 \end{lstlisting}

   136 \end{document}