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Figure 2 . Program output from replacing an element with a list.
Create and print a list [100, 200, 300, 400, 500]Original length is: 5Replace an element Print the modified list[100, 200, [2, 4, 8, 16, 32, 64], 400, 500]Modified length is: 5

One element is itself a list

As you can see from Figure 2 , the result is that one of the elements in the original five-element list is replaced by a new list containing six elements. However,the length of the list is unchanged.

Again, it is important to note that this results in one list being nested inside of another list.

A visualization

The code visualization shown in Figure 3 summarizes the concepts that were explainedin the previous two sections. This image was produced by entering the five statements shown in the code visualizer's code window and stepping through all five instructions.

Figure 3. Visualization.


I recommend that you use the code visualizer to step through this code and observe the state of the program in memory as eachinstruction is executed. Try to correlate the behavior of this program with what you learned in the sections above titled Replacing a slice and Replacing an element with a list .

Extracting elements from a nested list

Now I am going to illustrate the syntax for extracting elements from a nested list using pairs of matching square brackets . Listing 3 is an expansion of Listing 2 .

Listing 3 . Extracting elements from a nested list.
# Illustrates extracting a # list element and extracting# elements from a nested list ##------------------------------- print("Create and print a list")listA = [100,200,300,400,500] print(listA)print("Original length is:") print(len(listA))print("Replace an element") listA[2]= [2,4,8,16,32,64] print("Print the modified list")print(listA) print("Modified length is:")print(len(listA)) print("Extract and display each")print(" element in the list") print(listA[0]) print(listA[1]) print(listA[2]) print(listA[3]) print(listA[4]) print("Extract and display each")print(" element in nested list") print(listA[2][0])print(listA[2][1]) print(listA[2][2])print(listA[2][3]) print(listA[2][4])print(listA[2][5])

Display the nested list combination

After nesting a list as element 2 in another list, the program displays the value of each of the elements of the original list. When element 2 is displayed,it can be seen to be another list.

Double-square-bracket notation

Then the program uses double-square-bracket notation (listA[2][4]) to extract and display each of the elements in the nested inner list that comprises element 2 of the outer list.

Program output from extracting elements from a nested list

The output from this program is shown in Figure 4 .

Figure 4 . Program output from extracting elements from a nested list.
Create and print a list [100, 200, 300, 400, 500]Original length is: 5Replace an element Print the modified list[100, 200, [2, 4, 8, 16, 32, 64], 400, 500]Modified length is: 5Extract and display each element in the list100 200[2, 4, 8, 16, 32, 64] 400500 Extract and display eachelement in nested list 24 816 3264

Questions & Answers

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
what's the easiest and fastest way to the synthesize AgNP?
Damian Reply
how did you get the value of 2000N.What calculations are needed to arrive at it
Smarajit Reply
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