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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.

Table of contents


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.

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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.)


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



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.

What is a tuple ?

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.

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) .

Questions & Answers

Is there any normative that regulates the use of silver nanoparticles?
Damian Reply
what king of growth are you checking .?
What fields keep nano created devices from performing or assimulating ? Magnetic fields ? Are do they assimilate ?
Stoney Reply
why we need to study biomolecules, molecular biology in nanotechnology?
Adin Reply
yes I'm doing my masters in nanotechnology, we are being studying all these domains as well..
what school?
biomolecules are e building blocks of every organics and inorganic materials.
anyone know any internet site where one can find nanotechnology papers?
Damian Reply
sciencedirect big data base
Introduction about quantum dots in nanotechnology
Praveena Reply
what does nano mean?
Anassong Reply
nano basically means 10^(-9). nanometer is a unit to measure length.
do you think it's worthwhile in the long term to study the effects and possibilities of nanotechnology on viral treatment?
Damian Reply
absolutely yes
how to know photocatalytic properties of tio2 nanoparticles...what to do now
Akash Reply
it is a goid question and i want to know the answer as well
characteristics of micro business
for teaching engĺish at school how nano technology help us
Do somebody tell me a best nano engineering book for beginners?
s. Reply
there is no specific books for beginners but there is book called principle of nanotechnology
what is fullerene does it is used to make bukky balls
Devang Reply
are you nano engineer ?
fullerene is a bucky ball aka Carbon 60 molecule. It was name by the architect Fuller. He design the geodesic dome. it resembles a soccer ball.
what is the actual application of fullerenes nowadays?
That is a great question Damian. best way to answer that question is to Google it. there are hundreds of applications for buck minister fullerenes, from medical to aerospace. you can also find plenty of research papers that will give you great detail on the potential applications of fullerenes.
what is the Synthesis, properties,and applications of carbon nano chemistry
Abhijith Reply
Mostly, they use nano carbon for electronics and for materials to be strengthened.
is Bucky paper clear?
carbon nanotubes has various application in fuel cells membrane, current research on cancer drug,and in electronics MEMS and NEMS etc
so some one know about replacing silicon atom with phosphorous in semiconductors device?
s. Reply
Yeah, it is a pain to say the least. You basically have to heat the substarte up to around 1000 degrees celcius then pass phosphene gas over top of it, which is explosive and toxic by the way, under very low pressure.
Do you know which machine is used to that process?
how to fabricate graphene ink ?
for screen printed electrodes ?
What is lattice structure?
s. Reply
of graphene you mean?
or in general
in general
Graphene has a hexagonal structure
On having this app for quite a bit time, Haven't realised there's a chat room in it.
what is biological synthesis of nanoparticles
Sanket Reply
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Source:  OpenStax, Itse 1359 introduction to scripting languages: python. OpenStax CNX. Jan 22, 2016 Download for free at https://legacy.cnx.org/content/col11713/1.32
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