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-.. Objectives
-.. ----------
-
-.. By the end of this tutorial, you will be able to
-
-.. 1. Slice strings and get sub-strings out of them
-.. #. Reverse strings
-.. #. Replace characters in strings. 
-.. #. Convert strings to upper or lower case
-.. #. joining a list of strings
-
-.. Prerequisites
-.. -------------
-
-..   1. getting started with strings
-..   #. getting started with lists
-..   #. basic datatypes
-     
-.. Author              : Puneeth 
-   Internal Reviewer   : Amit 
-   External Reviewer   :
-   Language Reviewer   : Bhanukiran
-   Checklist OK?       : <08-11-2010, Anand, OK> [2010-10-05]
-
-Script
-------
-
-{{{ Show the slide containing title }}}
-
-Hello Friends. Welcome to this tutorial on manipulating strings. 
-
-{{{ show the slide with outline }}} 
-
-In this tutorial we shall learn to manipulate strings, specifically
-slicing and reversing them, or replacing characters, converting from
-upper to lower case and vice-versa and joining a list of strings.
-
-We have an ``ipython`` shell open, in which we are going to work,
-through out this session. 
-
-Let us consider a simple problem, and learn how to slice strings and
-get sub-strings. 
-
-Let's say the variable ``week`` has the list of the names of the days
-of the week. 
-
-::
-
-    week = ["sun", "mon", "tue", "wed", "thu", "fri", "sat"]
-
-
-Now given a string ``s``, we should be able to check if the string is a
-valid name of a day of the week or not. 
-
-::
-
-    s = saturday
-
-
-``s`` could be in any of the forms --- sat, saturday, Sat, Saturday,
-SAT, SATURDAY. For now, shall now be solving the problem only for the forms,
-sat and saturday. We shall solve it for the other forms, at the end of
-the tutorial. 
-
-{{{ show these forms in a slide }}}
-
-So, we need to check if the first three characters of the given string
-exists in the variable ``week``. 
-
-As, with any of the sequence data-types, strings can be sliced into
-sub-strings. To get the first three characters of s, we say,
-
-::
-
-    s[0:3]
-
-Note that, we are slicing the string from the index 0 to index 3, 3
-not included. 
-
-As we already know, the last element of the string can be accessed
-using ``s[-1]``.  
-
-Following is an exercise that you must do. 
-
-%%1%% Obtain the sub-string excluding the first and last characters
-from the string s. 
-
-Please, pause the video here. Do the exercise(s) and then continue. 
-
-::
-
-    s[1:-1]
-
-gives the substring of s, without the first and the last
-characters of s. 
-
-::
-
-    s = saturday
-    s[:3]
-
-Now, we just check if that substring is present in the variable
-``week``. 
-
-::
-
-    s[:3] in week          
-
-Let us now consider the problem of finding out if a given string is
-palindromic or not. First of all, a palindromic string is a string
-that remains same even when it has been reversed.
-
-Let the string given be ``malayalam``.
-
-::
-
-    s = "malayalam"
-
-Now, we need to compare this string with it's reverse. 
-
-Again, we will use a technique common to all sequence data-types,
-[::-1]
-
-So, we obtain the reverse of s, by simply saying, 
-
-::
-
-    s[::-1]
-
-Now, to check if the string is ``s`` is palindromic, we say
-::
-
-    s == s[::-1]
-
-As, expected, we get ``True``. 
-
-Now, if the string we are given is ``Malayalam`` instead of
-``malayalam``, the above comparison would return a False. So, we will
-have to convert the string to all lower case or all upper case, before
-comparing. Python provides methods, ``s.lower`` and ``s.upper`` to
-achieve this. 
-
-Let's try it out. 
-::
-
-   s = "Malayalam"
-
-   s.upper()
-
-   s
-
-As you can see, s has not changed. It is because, ``upper`` returns a
-new string. It doesn't change the original string. 
-
-::
-
-   s.lower()
-
-   s.lower() == s.lower()[::-1]
-   
-Following is an exercise that you must do. 
-
-%%2%% Check if ``s`` is a valid name of a day of the week. Change the
-solution to this problem, to include forms like, SAT, SATURDAY,
-Saturday and Sat.
-
-Please, pause the video here. Do the exercise and then continue. 
-
-::
-
-    s in week
-
-    s.lower()[:3] in week
-
-
-So, as you can see, now we can check for presence of ``s`` in
-``week``, in whichever format it is present -- capitalized, or all
-caps, full name or short form.
-
-We just convert any input string to lower case and then check if it is
-present in the list ``week``. 
-
-Now, let us consider another problem. We often encounter e-mail id's
-which have @ and periods replaced with text, something like
-info[at]fossee[dot]in. We now wish to get back proper e-mail
-addresses.  
-
-Let's say the variable email has the email address. 
-::
-
-   email = "info[at]fossee[dot]in"
-
-Now, we first replace the ``[at]`` with the ``@``, using the replace
-method of strings. 
-::
-
-   email = email.replace("[at]", "@")
-   print email
-
-Following is an exercise that you must do. 
-
-%%3%% Replace the ``[dot]`` with ``.`` in ``email``
-
-Please, pause the video here. Do the exercise and then continue. 
-
-::
-
-   email = email.replace("[dot]", ".")        
-   print email
-
-Now, let's look at another interesting problem where we have a list of
-e-mail addresses and we wish to obtain one long string of e-mail
-addresses separated by commas or semi-colons. 
-
-::
-
-  email_list = ["info@fossee.in", "enquiries@fossee.in",  "help@fossee.in"]
-
-
-Now, if we wish to obtain one long string, separating each of the
-email id by a comma, we use the join operator on ``,``. 
-
-::
-
-  email_str = ", ".join(email_list)
-  print email_str
-
-Notice that the email ids are joined by a comma followed by a space. 
-
-Following is an exercise that you must do. 
-
-%%3%% From the email_str that we generated, change the separator to be
-a semicolon instead of a comma. 
-
-Please, pause the video here. Do the exercise and then continue. 
-
-::
-
-  email_str = email_str.replace(",", ";")
-
-That brings us to the end of the tutorial. 
-
-{{{ show summary slide }}}
-
-In this tutorial, we have learnt how to get substrings, reverse
-strings and a few useful methods, namely upper, lower, replace and
-join. 
-
-{{{ Show the "sponsored by FOSSEE" slide }}}
-
-This tutorial was created as a part of FOSSEE project, NME ICT, MHRD India
-
-Hope you have enjoyed and found it useful.
-Thank you!
-