1.27 Itse1359-1090-lists part 2  (Page 3/4)

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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```

anyone know any internet site where one can find nanotechnology papers?
research.net
kanaga
Introduction about quantum dots in nanotechnology
what does nano mean?
nano basically means 10^(-9). nanometer is a unit to measure length.
Bharti
do you think it's worthwhile in the long term to study the effects and possibilities of nanotechnology on viral treatment?
absolutely yes
Daniel
how to know photocatalytic properties of tio2 nanoparticles...what to do now
it is a goid question and i want to know the answer as well
Maciej
Abigail
for teaching engĺish at school how nano technology help us
Anassong
Do somebody tell me a best nano engineering book for beginners?
there is no specific books for beginners but there is book called principle of nanotechnology
NANO
what is fullerene does it is used to make bukky balls
are you nano engineer ?
s.
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.
Tarell
what is the actual application of fullerenes nowadays?
Damian
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.
Tarell
what is the Synthesis, properties,and applications of carbon nano chemistry
Mostly, they use nano carbon for electronics and for materials to be strengthened.
Virgil
is Bucky paper clear?
CYNTHIA
carbon nanotubes has various application in fuel cells membrane, current research on cancer drug,and in electronics MEMS and NEMS etc
NANO
so some one know about replacing silicon atom with phosphorous in semiconductors device?
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.
Harper
Do you know which machine is used to that process?
s.
how to fabricate graphene ink ?
for screen printed electrodes ?
SUYASH
What is lattice structure?
of graphene you mean?
Ebrahim
or in general
Ebrahim
in general
s.
Graphene has a hexagonal structure
tahir
On having this app for quite a bit time, Haven't realised there's a chat room in it.
Cied
what is biological synthesis of nanoparticles
what's the easiest and fastest way to the synthesize AgNP?
China
Cied
types of nano material
I start with an easy one. carbon nanotubes woven into a long filament like a string
Porter
many many of nanotubes
Porter
what is the k.e before it land
Yasmin
what is the function of carbon nanotubes?
Cesar
I'm interested in nanotube
Uday
what is nanomaterials​ and their applications of sensors.
in a comparison of the stages of meiosis to the stage of mitosis, which stages are unique to meiosis and which stages have the same event in botg meiosis and mitosis
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