# 1.29 Itse1359-1100-indexing and slicing tuples

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This module and several modules that follow will use sample programs to show you a variety of ways to manipulate and use tuples.

## Preface

This module is one in a collection of modules on Python designed for teaching ITSE 1359 Introduction to Scripting Languages: Python at Austin Community College in Austin, TX.

## Viewing tip

I recommend that you open another copy of this module in a separate browser window and use the following links to easily find and view the Figures and the Listingswhile you are reading about them.

(Note to blind and visually impaired students: most of the Figures and all of the Listings in this module are presented in plain text format and should be accessible using anaudio screen reader or a braille display.)

## Figures

• Figure 1 . Visualization of a tuple.
• Figure 2 . Output from code in Listing 6.

## Introduction

Previous modules have introduced you to lists, subscriptions, sequences, mutable sequences, mappings, slicings, and have mentioned tuples.

Those modules showed you some of the ways that you can manipulate lists. The discussion was illustrated using sample programs.

The introduction to tuples in previous modules was very brief. This and several future modules will use sample programs to show you a variety of waysto manipulate and use tuples.

## Description of a tuple

As a practical matter, a tuple is like a list whose values cannot be modified. In other words, a tuple is immutable .

According to Lutz and Ascher, Learning Python from O'Reilly, tuples are "Ordered collections of arbitrary objects."

Again according to Lutz and Ascher, "They work exactly like lists, except that tuples can't be changed in place (they're immutable)..."

Unlike lists, however, tuples don't use square brackets for containment. Rather, they are normally written as a sequence of items contained inparentheses.

Like a string or a list, a tuple is a sequence . Like a string (but unlike a list) , a tuple is an immutable sequence.

Tuples can contain other compound objects, including lists, dictionaries, and other tuples. Hence, tuples can be nested.

## An array of references

One way to think of a tuple is to consider it to be an array of references to other objects.

For example, Figure 1 shows a visualization of the tuple from Listing 6 . As you can see, each element in the tuple object at the bottom right contains a reference or apointer to another object.

Figure 1. Visualization of a tuple.

While the tuple itself cannot be changed in place, the values contained in the objects that are referred to by the contents of the tuple can be changed (assuming that those objects are mutable) .

where we get a research paper on Nano chemistry....?
nanopartical of organic/inorganic / physical chemistry , pdf / thesis / review
Ali
what are the products of Nano chemistry?
There are lots of products of nano chemistry... Like nano coatings.....carbon fiber.. And lots of others..
learn
Even nanotechnology is pretty much all about chemistry... Its the chemistry on quantum or atomic level
learn
da
no nanotechnology is also a part of physics and maths it requires angle formulas and some pressure regarding concepts
Bhagvanji
hey
Giriraj
Preparation and Applications of Nanomaterial for Drug Delivery
revolt
da
Application of nanotechnology in medicine
what is variations in raman spectra for nanomaterials
ya I also want to know the raman spectra
Bhagvanji
I only see partial conversation and what's the question here!
what about nanotechnology for water purification
please someone correct me if I'm wrong but I think one can use nanoparticles, specially silver nanoparticles for water treatment.
Damian
yes that's correct
Professor
I think
Professor
Nasa has use it in the 60's, copper as water purification in the moon travel.
Alexandre
nanocopper obvius
Alexandre
what is the stm
is there industrial application of fullrenes. What is the method to prepare fullrene on large scale.?
Rafiq
industrial application...? mmm I think on the medical side as drug carrier, but you should go deeper on your research, I may be wrong
Damian
How we are making nano material?
what is a peer
What is meant by 'nano scale'?
What is STMs full form?
LITNING
scanning tunneling microscope
Sahil
how nano science is used for hydrophobicity
Santosh
Do u think that Graphene and Fullrene fiber can be used to make Air Plane body structure the lightest and strongest. Rafiq
Rafiq
what is differents between GO and RGO?
Mahi
what is simplest way to understand the applications of nano robots used to detect the cancer affected cell of human body.? How this robot is carried to required site of body cell.? what will be the carrier material and how can be detected that correct delivery of drug is done Rafiq
Rafiq
if virus is killing to make ARTIFICIAL DNA OF GRAPHENE FOR KILLED THE VIRUS .THIS IS OUR ASSUMPTION
Anam
analytical skills graphene is prepared to kill any type viruses .
Anam
Any one who tell me about Preparation and application of Nanomaterial for drug Delivery
Hafiz
what is Nano technology ?
write examples of Nano molecule?
Bob
The nanotechnology is as new science, to scale nanometric
brayan
nanotechnology is the study, desing, synthesis, manipulation and application of materials and functional systems through control of matter at nanoscale
Damian
Is there any normative that regulates the use of silver nanoparticles?
what king of growth are you checking .?
Renato
What fields keep nano created devices from performing or assimulating ? Magnetic fields ? Are do they assimilate ?
why we need to study biomolecules, molecular biology in nanotechnology?
?
Kyle
yes I'm doing my masters in nanotechnology, we are being studying all these domains as well..
why?
what school?
Kyle
biomolecules are e building blocks of every organics and inorganic materials.
Joe
how did you get the value of 2000N.What calculations are needed to arrive at it
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