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

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## Replacing a slice

You can replace a slice in a list with the elements from another list through assignment.

## Can change the length of the list

Note that this operation can change the length of the original list.

The script in Listing 1 replaces a slice in a list with the elements from another list.

Listing 1 . Replace a slice in a list.
```# Illustrates replacing a slice in a list ##---------------------------------------- print("Create and print a list")listA = [100,200,300,400,500] print(listA)print("Original length is:") print(len(listA))print("Replace a slice") listA[1:4]= [2,4,8,16,32,64] print("Print the modified list")print(listA) print("Modified length is:")print(len(listA))```

## The function named len()

This program also illustrates the use of the function named len() to get and print the length of the list.

## Replaces a three-element slice with a six-element list

In this program, a slice of an original five-element list, consisting of the elements from 1 through 3 inclusive, is replaced by the elements of a new listconsisting of six new elements.

## Length of the list is increased by 3

Since three existing elements are replaced by six new elements, the overall length of the listis increased by three elements.

## Program output

The output from this program is shown in Figure 1 .

Figure 1 . Program output.
```Create and print a list [100, 200, 300, 400, 500]Original length is: 5Replace a slice Print the modified list[100, 2, 4, 8, 16, 32, 64, 500] Modified length is:8```

As you can see in Figure 1 , the six new elements replaced the three original elements to increase the length of the list from 5 to 8 elements.

## Replacing an element with a list

It is also possible to replace an element in an existing list with a new list, as illustrated by the program in Listing 2 .

## Behavior is different from above

In this case, the behavior is different from that shown above where a slice from the original list was replaced with the elements from a different list (even though the right operand of the assignment operator is the same in both cases) .

## Produces nested lists

When a single element is replaced by a list, the result is that a new list is nested inside the original list .

## Length is unchanged

It is also interesting to note that the length of the list is unchanged by this operation since the list that replaces the element is itself considered tobe a single element. Therefore, the number of elements is not changed.

This is illustrated in Listing 2 , where the element at index 2 of an original list is replaced with a new listhaving six elements.

Listing 2 . Replacing an element with a list.
```# Illustrates replacing an # element with a slice# #-------------------------------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))```

## Program output from replacing an element with a list

The output from this program is shown in Figure 2 .

where we get a research paper on Nano chemistry....?
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
Preparation and Applications of Nanomaterial for Drug Delivery
revolt
da
Application of nanotechnology in medicine
what is variations in raman spectra for nanomaterials
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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