getting-started-with-lists/script.rst
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.. Objectives
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.. ----------
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.. By the end of this tutorial, you will be able to
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.. Create Lists.
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.. Access List elements.
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.. Append elemets to list
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.. Delete list elemets
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.. 1. getting started with ipython 
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.. Prerequisites
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.. -------------
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..   1. getting started with strings
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..   #. getting started with lists
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..   #. basic datatypes
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.. Author              : Amit 
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   Internal Reviewer   : Anoop Jacob Thomas <anoop@fossee.in>
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   External Reviewer   :
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   Checklist OK?       : <put date stamp here, if OK> [2010-10-05]
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.. #[[Anoop: Slides contain only outline and summary
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Script
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------
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 {{{ Show the slide containing title }}}
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Hello friends and welcome to the tutorial on getting started with
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lists.
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 {{{ Show the slide containing the outline slide }}}
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In this tutorial we will be getting acquainted with a python data
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structure called lists.  We will learn ::
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 * How to create lists
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 * Structure of lists
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 * Access list elements
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 * Append elements to lists
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 * Delete elements from lists
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List is a compound data type, it can contain data of other data
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types. List is also a sequence data type, all the elements are in
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order and the order has a meaning.
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.. #[[Anoop: "all the elements are in order and **there** order has a
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   meaning." - I guess something is wrong here, I am not able to
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   follow this.]]
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We will first create an empty list with no elements. On your IPython
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shell type ::
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   empty = [] 
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   type(empty)
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This is an empty list without any elements.
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.. #[[Anoop: the document has to be continous, without any
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   subheadings, removing * Filled lists]]
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Lets now see how to define a non-empty list. We do it as,::
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     nonempty = ['spam', 'eggs', 100, 1.234]
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Thus the simplest way of creating a list is typing out a sequence 
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of comma-separated values (items) between square brackets. 
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All the list items need not be of the same data type.
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As we can see lists can contain different kinds of data. In the
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previous example 'spam' and 'eggs' are strings and 100 and 1.234 are
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integer and float. Thus we can put elements of heterogenous types in
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lists including list itself.
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.. #[[Anoop: the sentence "Thus list themselves can be one of the
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   element types possible in lists" is not clear, rephrase it.]]
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Example ::
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      listinlist=[[4,2,3,4],'and', 1, 2, 3, 4]
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We access list elements using the index. The index begins from 0. So
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for list nonempty, nonempty[0] gives the first element, nonempty[1]
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the second element and so on and nonempty[3] the last element. ::
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	    nonempty[0] 
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	    nonempty[1] 
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	    nonempty[3]
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Following is an exercise that you must do. 
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%% %% What happens when you do nonempty[-1]. 
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Please, pause the video here. Do the exercise and then continue.  
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.. #[[Anoop: was negative indices introduced earlier, if not may be we
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   can ask them to try out nonempty[-1] and see what happens and then
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   tell that it gives the last element in the list.]]
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As you can see you get the last element which is 1.234.
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In python negative indices are used to access elements from the end::
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   nonempty[-1] 
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   nonempty[-2] 
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   nonempty[-4]
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-1 gives the last element which is the 4th element , -2 second to last
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and -4 gives the fourth from last element which is first element.
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We can append elements to the end of a list using append command. ::
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   nonempty.append('onemore') 
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   nonempty
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   nonempty.append(6) 
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   nonempty
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Following are  exercises that you must do. 
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%% %% What is the syntax to get the element 'and' 
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in the list,listinlist ?
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%% %% How would you get 'and' using negative indices?
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Please, pause the video here. Do the exercise and then continue.  
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The solution is on your screen
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As we can see non empty appends 'onemore' and 6 at the end.
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Using len function we can check the number of elements in the list
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nonempty. In this case it 6 ::
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	 len(nonempty)
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Just like we can append elements to a list we can also remove them.
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There are two ways of doing it. One is by using index. ::
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      del(nonempty[1])
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deletes the element at index 1, i.e the second element of the
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list, 'eggs'. The other way is removing element by content. Lets say
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one wishes to delete 100 from nonempty list the syntax of the command
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should be 
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.. #[[Anoop: let x = [1,2,1,3]
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   	     now x.remove(x[2])
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	     still x is [2,1,3] so that is not the way to remove
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	     element by index, it removed first occurrence of 1(by
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	     content) and not based on index, so make necessary
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	     changes]]
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::
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    nonempty.remove(100)
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but what if there were two 100's. To check that lets do a small
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experiment. ::
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	   nonempty.append('spam') 
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	   nonempty
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	   nonempty.remove('spam') 
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	   nonempty
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If we check now we will see that the first occurence 'spam' is removed
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thus remove removes the first occurence of the element in the sequence
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and leaves others untouched.
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.. #[[Anoop: does it have two spams or two pythons?]]
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.. #[[Anoop: there are no exercises/solved problems in this script,
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   add them]]
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Following are  exercises that you must do. 
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%% %% Remove the third element from the list, listinlist.   
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%% %% Remove 'and' from the list, listinlist.
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Please, pause the video here. Do the exercise and then continue.  
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{{{Slide for Summary }}}
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In this tutorial we came across a sequence data type called lists. ::
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 * We learned how to create lists.  
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 * How to access lists.
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 * Append elements to list.
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 * Delete Element from list.  
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 * And Checking list length.
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{{{ show Sponsored by Fossee Slide }}}
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This tutorial was created as a part of FOSSEE project.
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I hope you found this tutorial useful.
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Thank You
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..
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 * Author : Amit Sethi 
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 * First Reviewer : 
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 * Second Reviewer : Nishanth