tuples/script.rst
author Amit Sethi
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Made some changes to accessing pieces of arrays while doing a test recording.
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.. Objectives
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.. ----------
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.. A - Students and teachers from Science and engineering backgrounds
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   B - Will learn what are tuples and why they are needed
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       Will learn the various methods of accessing elements in tuples
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   C - 
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   D - 
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8c35d7977f04 Slides for tuples LO.
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.. #. what are tuples
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.. #. comparison with lists
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.. #. why are they needed
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.. Prerequisites
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.. -------------
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..   1. Getting started with lists
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.. Author              : Nishanth Amuluru
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   Internal Reviewer   : 
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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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Script
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------
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Hello friends and welcome to the tutorial on Tuples
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{{{ Show the slide containing title }}}
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{{{ Show the slide containing the outline slide }}}
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In this tutorial, we shall learn
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 * what are tuples
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 * their similarities and dissimilarities with lists
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 * why are they needed
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Let`s get started by defining a tuple. A tuple is defined by enclosing
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parantheses around a sequence of items seperated by commas. It is similar to
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defining a list except that parantheses are used instead of square brackets.
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::
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    t = (1, 2.5, "hello", -4, "world", 1.24, 5)
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    t
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defines a tuple. The items in the tuple are indexed using numbers and can be 
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accessed by using their position.
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::
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    t[3]
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prints -4 which is the fourth item of the tuple.
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::
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    t[1:5:2]
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prints the corresponding slice
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This is the behaviour similar as to lists. But the difference can be seen when
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we try to change an element in the tuple.
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    t[2] = "Hello"
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We can see that, it raises an error saying tuple does not support item
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assignment. It only implies that tuples are immutable or in simple words,
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tuples cannot be changed.
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But what is the use of tuples!!!
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We shall understand that soon. But let us look at a simple problem of swapping
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values.
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{{{ Pause here and try out the following exercises }}}
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%% 1 %% a = 5 and b = 7. swap the values of a and b
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{{{ continue from paused state }}}
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::
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    a = 5
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    b = 7
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    a
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    b
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We define the two values
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::
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    temp = a
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    a = b
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    b = temp
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    a
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    b
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This is the traditional approach
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Now let us do it the python way
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::
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    a
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    b
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    a, b = b, a
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    a
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    b
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We see that the values are swapped.
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This idiom works for different datatypes also.
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    a = 2.5
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    b = "hello"
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    a
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    b
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Moreover this type of behaviour is straight forward and what you would expect
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should happen naturally.
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This is possible because of the immutability of tuples. This process is called
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tuple packing and unpacking.
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Let us first see what is tuple packing. Type
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    5,
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What we see is a tuple with one element.
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    5, "hello", 2.5
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Now it is a tuple with two elements.
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So when we are actually typing two or more elements seperated by commas, those
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elements are packed and a tuple is made from them.
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When you type
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::
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    a, b = b, a
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First the values of b and a are packed into a tuple on the right side and then
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unpacked into the variables a and b.
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Immutability of tuples ensures that the values are not changed during the
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packing and unpacking.
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{{{ Show summary slide }}}
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This brings us to the end of the tutorial.
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we have learnt
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 * How to define tuples
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 * The similarities of tuples with lists, like indexing and iterability
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 * The immutability of tuples
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 * The value swapping idiom in Python
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 * packing and unpacking of tuples
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{{{ Show the "sponsored by FOSSEE" slide }}}
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#[Nishanth]: Will add this line after all of us fix on one.
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This tutorial was created as a part of FOSSEE project, NME ICT, MHRD India
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Hope you have enjoyed and found it useful.
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Thankyou
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