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    13 #+LaTeX_HEADER: \usepackage{mathpazo,courier,euler} \usepackage[scaled=.95]{helvet}

    14 

    15 #+LaTeX_HEADER: \usepackage{listings}

    16 

    17 #+LaTeX_HEADER:\lstset{language=Python, basicstyle=\ttfamily\bfseries,

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    20 

    21 #+TITLE: Getting started with for

    22 #+AUTHOR: FOSSEE

    23 #+EMAIL:     

    24 #+DATE:    

    25 

    26 #+DESCRIPTION: 

    27 #+KEYWORDS: 

    28 #+LANGUAGE:  en

    29 #+OPTIONS:   H:3 num:nil toc:nil \n:nil @:t ::t |:t ^:t -:t f:t *:t <:t

    30 #+OPTIONS:   TeX:t LaTeX:nil skip:nil d:nil todo:nil pri:nil tags:not-in-toc

    31 

    32 * Outline

    33   - ~for~ loop in Python.

    34   - Blocks of code in Python.

    35     - Indentation

    36 * Whitespace in Python

    37   - Whitespace is significant

    38     - blocks are visually separated

    39   - Blocks are indented using 4 spaces

    40     : Block A

    41     : Block A

    42     :     Block B

    43     :     Block B

    44     : Block A

    45     ~Block B~ is an inner block and is indented using 4 spaces

    46 * Exercise 1

    47   Write a ~for~ loop which iterates through a list of numbers and find

    48   the square root of each number.

    49   : 

    50   The numbers are,

    51   : 1369, 7225, 3364, 7056, 5625, 729, 7056, 

    52   : 576, 2916

    53 * Solution 1

    54   - Open text editor and type the following code

    55   #+begin_src python

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

    57                576, 2916]

    58 

    59     for each in numbers:

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

    61 

    62     print "This is not in for loop!"

    63   #+end_src

    64 * Save \& run script

    65   - Save the script as ~list_roots.py~

    66   - Run in ~ipython~ interpreter as,

    67     : In []: %run -i list_roots.py

    68 * Exercise 2

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

    70   : 

    71   The numbers are,

    72   : 7225, 3268, 3364, 2966, 7056, 5625, 729, 5547, 

    73   : 7056, 576, 2916

    74 * Exercise 3 (indentation in ~ipython~)

    75   Print the square root of numbers in the list.

    76   : 

    77   Numbers are,

    78   : 7225, 3268, 3364, 2966, 7056, 5625, 729, 5547, 

    79   : 7056, 576, 2916

    80 * Indentation in ~ipython~

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

    82   :   ...:  729, 7056, 576, 2916]

    83 

    84   : In []: for each in numbers:

    85   :   ...:     

    86   Note the four spaces here

    87   : 

    88   : 

    89   : 

    90   : 

    91   : 

    92   : 

    93 * Indentation in ~ipython~ (cont'd)

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

    95   :   ...:  729, 7056, 576, 2916]

    96   : In []: for each in numbers:

    97   :   ...:     

    98   Note the four spaces here

    99   : 

   100   Now type the rest of the code

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

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

   103   :   ...:     

   104   :   ...:     

   105 * Indentation in ~python~ interpreter

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

   107   : 

   108   /do it in the python interpreter/

   109 * Indentation in ~python~ interpreter (cont'd)

   110   #+begin_src python

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

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

   113   ... 

   114   #+end_src

   115 * ~range()~ function

   116   - in built function in Python

   117   - generates a list of integers

   118     - /syntax:/ range([start,] stop[, step])

   119     - /example:/

   120       - range(1, 20) - /generates integers from 1 to 20/

   121       - range(20) - /generates integers from 0 to 20/

   122 * Exercise 4

   123   Print all the odd numbers from 1 to 50.

   124 * Summary

   125   - blocks in ~python~

   126   - indentation

   127   - blocks in ~ipython~ interpreter

   128   - ~for~ loop

   129   - iterating over list using ~for~ loop

   130   - ~range()~ function

   131 * Thank you!

   132 #+begin_latex

   133   \begin{block}{}

   134   \begin{center}

   135   This spoken tutorial has been produced by the

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

   137   \end{center}

   138   \begin{center}

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

   140       Information \& Communication Technology \\ 

   141       MHRD, Govt. of India}.

   142   \end{center}  

   143   \end{block}

   144 #+end_latex

   145 

   146