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diff --git a/getting-started-with-lists/script.rst.orig b/getting-started-with-lists/script.rst.orig index 754693e..3f068eb 100644 --- a/getting-started-with-lists/script.rst.orig +++ b/getting-started-with-lists/script.rst.orig @@ -1,361 +1,224 @@ -<?xml version="1.0" encoding="utf-8" ?> -<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> -<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en"> -<head> -<meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> -<meta name="generator" content="Docutils 0.6: http://docutils.sourceforge.net/" /> -<title></title> -<style type="text/css"> - -/* -:Author: David Goodger (goodger@python.org) -:Id: $Id: html4css1.css 5951 2009-05-18 18:03:10Z milde $ -:Copyright: This stylesheet has been placed in the public domain. - -Default cascading style sheet for the HTML output of Docutils. - -See http://docutils.sf.net/docs/howto/html-stylesheets.html for how to -customize this style sheet. -*/ - -/* used to remove borders from tables and images */ -.borderless, table.borderless td, table.borderless th { - border: 0 } - -table.borderless td, table.borderless th { - /* Override padding for "table.docutils td" with "! important". - The right padding separates the table cells. */ - padding: 0 0.5em 0 0 ! important } - -.first { - /* Override more specific margin styles with "! important". */ - margin-top: 0 ! important } - -.last, .with-subtitle { - margin-bottom: 0 ! important } - -.hidden { - display: none } - -a.toc-backref { - text-decoration: none ; - color: black } - -blockquote.epigraph { - margin: 2em 5em ; } - -dl.docutils dd { - margin-bottom: 0.5em } - -/* Uncomment (and remove this text!) to get bold-faced definition list terms -dl.docutils dt { - font-weight: bold } -*/ - -div.abstract { - margin: 2em 5em } - -div.abstract p.topic-title { - font-weight: bold ; - text-align: center } - -div.admonition, div.attention, div.caution, div.danger, div.error, -div.hint, div.important, div.note, div.tip, div.warning { - margin: 2em ; - border: medium outset ; - padding: 1em } - -div.admonition p.admonition-title, div.hint p.admonition-title, -div.important p.admonition-title, div.note p.admonition-title, -div.tip p.admonition-title { - font-weight: bold ; - font-family: sans-serif } - -div.attention p.admonition-title, div.caution p.admonition-title, -div.danger p.admonition-title, div.error p.admonition-title, -div.warning p.admonition-title { - color: red ; - font-weight: bold ; - font-family: sans-serif } - -/* Uncomment (and remove this text!) to get reduced vertical space in - compound paragraphs. -div.compound .compound-first, div.compound .compound-middle { - margin-bottom: 0.5em } - -div.compound .compound-last, div.compound .compound-middle { - margin-top: 0.5em } -*/ - -div.dedication { - margin: 2em 5em ; - text-align: center ; - font-style: italic } - -div.dedication p.topic-title { - font-weight: bold ; - font-style: normal } - -div.figure { - margin-left: 2em ; - margin-right: 2em } - -div.footer, div.header { - clear: both; - font-size: smaller } +.. Objectives +.. ---------- -div.line-block { - display: block ; - margin-top: 1em ; - margin-bottom: 1em } +.. By the end of this tutorial, you will be able to -div.line-block div.line-block { - margin-top: 0 ; - margin-bottom: 0 ; - margin-left: 1.5em } +.. Create Lists. +.. Access List elements. +.. Append elemets to list +.. Delete list elemets -div.sidebar { - margin: 0 0 0.5em 1em ; - border: medium outset ; - padding: 1em ; - background-color: #ffffee ; - width: 40% ; - float: right ; - clear: right } +.. 1. getting started with ipython -div.sidebar p.rubric { - font-family: sans-serif ; - font-size: medium } -div.system-messages { - margin: 5em } -div.system-messages h1 { - color: red } +.. Prerequisites +.. ------------- -div.system-message { - border: medium outset ; - padding: 1em } +.. 1. getting started with strings +.. #. getting started with lists +.. #. basic datatypes + +.. Author : Amit + Internal Reviewer : Anoop Jacob Thomas <anoop@fossee.in> + External Reviewer : + Checklist OK? : <put date stamp here, if OK> [2010-10-05] -div.system-message p.system-message-title { - color: red ; - font-weight: bold } +.. #[[Anoop: Slides contain only outline and summary -div.topic { - margin: 2em } +Script +------ + {{{ Show the slide containing title }}} -h1.section-subtitle, h2.section-subtitle, h3.section-subtitle, -h4.section-subtitle, h5.section-subtitle, h6.section-subtitle { - margin-top: 0.4em } - -h1.title { - text-align: center } +Hello friends and welcome to the tutorial on getting started with +lists. -h2.subtitle { - text-align: center } + {{{ Show the slide containing the outline slide }}} -hr.docutils { - width: 75% } +In this tutorial we will be getting acquainted with a python data +structure called lists. We will learn :: + + * How to create lists + * Structure of lists + * Access list elements + * Append elements to lists + * Delete elements from lists -img.align-left, .figure.align-left{ - clear: left ; - float: left ; - margin-right: 1em } +List is a compound data type, it can contain data of other data +types. List is also a sequence data type, all the elements are in +order and the order has a meaning. -img.align-right, .figure.align-right { - clear: right ; - float: right ; - margin-left: 1em } +.. #[[Anoop: "all the elements are in order and **there** order has a + meaning." - I guess something is wrong here, I am not able to + follow this.]] -.align-left { - text-align: left } +We will first create an empty list with no elements. On your IPython +shell type :: -.align-center { - clear: both ; - text-align: center } + empty = [] + type(empty) + -.align-right { - text-align: right } +This is an empty list without any elements. -/* reset inner alignment in figures */ -div.align-right { - text-align: left } +.. #[[Anoop: the document has to be continous, without any + subheadings, removing * Filled lists]] -/* div.align-center * { */ -/* text-align: left } */ +Lets now see how to define a non-empty list. We do it as,:: -ol.simple, ul.simple { - margin-bottom: 1em } + nonempty = ['spam', 'eggs', 100, 1.234] -ol.arabic { - list-style: decimal } +Thus the simplest way of creating a list is typing out a sequence +of comma-separated values (items) between square brackets. +All the list items need not be of the same data type. -ol.loweralpha { - list-style: lower-alpha } +As we can see lists can contain different kinds of data. In the +previous example 'spam' and 'eggs' are strings and 100 and 1.234 are +integer and float. Thus we can put elements of heterogenous types in +lists including list itself. -ol.upperalpha { - list-style: upper-alpha } +.. #[[Anoop: the sentence "Thus list themselves can be one of the + element types possible in lists" is not clear, rephrase it.]] -ol.lowerroman { - list-style: lower-roman } +Example :: -ol.upperroman { - list-style: upper-roman } + listinlist=[[4,2,3,4],'and', 1, 2, 3, 4] -p.attribution { - text-align: right ; - margin-left: 50% } +We access list elements using the index. The index begins from 0. So +for list nonempty, nonempty[0] gives the first element, nonempty[1] +the second element and so on and nonempty[3] the last element. :: -p.caption { - font-style: italic } + nonempty[0] + nonempty[1] + nonempty[3] -p.credits { - font-style: italic ; - font-size: smaller } +Following is an exercise that you must do. -p.label { - white-space: nowrap } +%% %% What happens when you do nonempty[-1]. -p.rubric { - font-weight: bold ; - font-size: larger ; - color: maroon ; - text-align: center } +Please, pause the video here. Do the exercise and then continue. -p.sidebar-title { - font-family: sans-serif ; - font-weight: bold ; - font-size: larger } +.. #[[Anoop: was negative indices introduced earlier, if not may be we + can ask them to try out nonempty[-1] and see what happens and then + tell that it gives the last element in the list.]] -p.sidebar-subtitle { - font-family: sans-serif ; - font-weight: bold } - -p.topic-title { - font-weight: bold } - -pre.address { - margin-bottom: 0 ; - margin-top: 0 ; - font: inherit } - -pre.literal-block, pre.doctest-block { - margin-left: 2em ; - margin-right: 2em } - -span.classifier { - font-family: sans-serif ; - font-style: oblique } - -span.classifier-delimiter { - font-family: sans-serif ; - font-weight: bold } - -span.interpreted { - font-family: sans-serif } - -span.option { - white-space: nowrap } - -span.pre { - white-space: pre } - -span.problematic { - color: red } - -span.section-subtitle { - /* font-size relative to parent (h1..h6 element) */ - font-size: 80% } - -table.citation { - border-left: solid 1px gray; - margin-left: 1px } - -table.docinfo { - margin: 2em 4em } - -table.docutils { - margin-top: 0.5em ; - margin-bottom: 0.5em } - -table.footnote { - border-left: solid 1px black; - margin-left: 1px } - -table.docutils td, table.docutils th, -table.docinfo td, table.docinfo th { - padding-left: 0.5em ; - padding-right: 0.5em ; - vertical-align: top } - -table.docutils th.field-name, table.docinfo th.docinfo-name { - font-weight: bold ; - text-align: left ; - white-space: nowrap ; - padding-left: 0 } - -h1 tt.docutils, h2 tt.docutils, h3 tt.docutils, -h4 tt.docutils, h5 tt.docutils, h6 tt.docutils { - font-size: 100% } - -ul.auto-toc { - list-style-type: none } - -</style> -</head> -<body> -<div class="document"> - - -<div class="section" id="objective-questions"> -<h1>Objective Questions</h1> -<!-- A mininum of 8 questions here (along with answers) --> -<ol class="arabic"> -<li><p class="first">How do you create an empty list?</p> -<pre class="literal-block"> -empty=[] -</pre> -</li> -<li><p class="first">What is the most important property of sequence data types like lists?</p> -<p>The elements are in order and can be accessed by index numbers.</p> -</li> -<li><p class="first">Can you have a list inside a list ?</p> -<p>Yes,List can contain all the other data types, including list.</p> -<p>Example: -list_in_list=[2.3,[2,4,6],'string,'all datatypes can be there']</p> -</li> -<li><p class="first">What is the index number of the first element in a list?</p> -<p>0 -nonempty = ['spam', 'eggs', 100, 1.234] -nonempty[0]</p> -</li> -<li><p class="first">How would you access the end of a list without finding its length?</p> -<p>Using negative indices. We can the list from the end using negative indices.</p> -<p>:: -nonempty = ['spam', 'eggs', 100, 1.234] -nonempty[-1]</p> -</li> -<li><p class="first">What is the function to find the length of a list?</p> -<p>len</p> -</li> -<li><p class="first">Delete the last element from list sq=[5,4,3,2,1,0]</p> -<p>del(sq[-1])</p> -</li> -<li><p class="first">How many will you have to use remove function to remove all 6's from the given list sq=[2,5,6,7,6,4,6]?</p> -<p>3</p> -</li> -</ol> -</div> -<div class="section" id="larger-questions"> -<h1>Larger Questions</h1> -<!-- A minimum of 2 questions here (along with answers) --> -<p>1. Add all elemets of seq1=['e','f','g','h'] -to the sequence seq=['a','b','c','d']</p> -<ol class="arabic simple" start="2"> -<li>Delete all elements of seq1=[3,5,6] from sequence -seq=[1,2,3,4,5,6,7,8,9]</li> -</ol> -</div> -</div> -</body> -</html> +As you can see you get the last element which is 1.234. + + +In python negative indices are used to access elements from the end:: + + nonempty[-1] + nonempty[-2] + nonempty[-4] + +-1 gives the last element which is the 4th element , -2 second to last +and -4 gives the fourth from last element which is first element. + +We can append elements to the end of a list using append command. :: + + nonempty.append('onemore') + nonempty + nonempty.append(6) + nonempty + +Following are exercises that you must do. + +%% %% What is the syntax to get the element 'and' +in the list,listinlist ? + + +%% %% How would you get 'and' using negative indices? + +Please, pause the video here. Do the exercise and then continue. + +The solution is on your screen + + +As we can see non empty appends 'onemore' and 6 at the end. + +Using len function we can check the number of elements in the list +nonempty. In this case it 6 :: + + len(nonempty) + + + +Just like we can append elements to a list we can also remove them. +There are two ways of doing it. One is by using index. :: + + del(nonempty[1]) + + + +deletes the element at index 1, 'eggs' which is the second element of +the list. The other way is removing element by content. Lets say one +wishes to delete 100 from nonempty list the syntax of the command +should be + +.. #[[Anoop: let x = [1,2,1,3] + now x.remove(x[2]) + still x is [2,1,3] so that is not the way to remove + element by index, it removed first occurrence of 1(by + content) and not based on index, so make necessary + changes]] + +:: + + nonempty.remove(100) + +but what if there were two 100's. To check that lets do a small +experiment. :: + + nonempty.append('spam') + nonempty + nonempty.remove('spam') + nonempty + +If we check now we will see that the first occurence 'spam' is removed +thus remove removes the first occurence of the element in the sequence +and leaves others untouched. + + + + + +.. #[[Anoop: does it have two spams or two pythons?]] + +.. #[[Anoop: there are no exercises/solved problems in this script, + add them]] + +Following are exercises that you must do. + +%% %% Remove the third element from the list, listinlist. + +%% %% Remove 'and' from the list, listinlist. + +Please, pause the video here. Do the exercise and then continue. + + + +{{{Slide for Summary }}} + + +In this tutorial we came across a sequence data type called lists. :: + + * We learned how to create lists. + * How to access lists. + * Append elements to list. + * Delete Element from list. + * And Checking list length. + + + +{{{ show Sponsored by Fossee Slide }}} + +This tutorial was created as a part of FOSSEE project. + +I hope you found this tutorial useful. + +Thank You + +.. + * Author : Amit Sethi + * First Reviewer : + * Second Reviewer : Nishanth |