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#+TITLE: Getting started with for

#+AUTHOR: FOSSEE

#+EMAIL:     

#+DATE:    

#+DESCRIPTION: 

#+KEYWORDS: 

#+LANGUAGE:  en

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* Outline

  - ~for~ loop in Python.

  - Blocks of code in Python.

    - Indentation

* Whitespace in Python

  - Whitespace is significant

    - blocks are visually separated

  - Blocks are indented using 4 spaces

    : Block A

    : Block A

    :     Block B

    :     Block B

    : Block A

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

* Exercise 1

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

  the square root of each number.

  : 

  The numbers are,

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

  : 576, 2916

* Solution 1

  - Open text editor and type the following code

  #+begin_src python

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

               576, 2916]

    for each in numbers:

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

    print "This is not in for loop!"

  #+end_src

* Save \& run script

  - Save the script as ~list_roots.py~

  - Run in ~ipython~ interpreter as,

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

* Exercise 2

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

  : 

  The numbers are,

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

  : 7056, 576, 2916

* Exercise 3 (indentation in ~ipython~)

  Print the square root of numbers in the list.

  : 

  Numbers are,

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

  : 7056, 576, 2916

* Indentation in ~ipython~

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

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

  : In []: for each in numbers:

  :   ...:     

  Note the four spaces here

  : 

  : 

  : 

  : 

  : 

  : 

* Indentation in ~ipython~ (cont'd)

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

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

  : In []: for each in numbers:

  :   ...:     

  Note the four spaces here

  : 

  Now type the rest of the code

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

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

  :   ...:     

  :   ...:     

* Indentation in ~python~ interpreter

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

  : 

  /do it in the python interpreter/

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

  #+begin_src python

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

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

  ... 

  #+end_src

* ~range()~ function

  - in built function in Python

  - generates a list of integers

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

    - /example:/

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

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

* Exercise 4

  Print all the odd numbers from 1 to 50.

* Summary

  - blocks in ~python~

  - indentation

  - blocks in ~ipython~ interpreter

  - ~for~ loop

  - iterating over list using ~for~ loop

  - ~range()~ function

* Thank you!

#+begin_latex

  \begin{block}{}

  \begin{center}

  This spoken tutorial has been produced by the

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

  \end{center}

  \begin{center}

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

      Information \& Communication Technology \\ 

      MHRD, Govt. of India}.

  \end{center}  

  \end{block}

#+end_latex