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The syntax for passing dList and bList however is significantly different from the previous examples.What you see is something closely akin to an assignment statement. In other words, the parameter named dList is assigned to the argument named listD . Also, the parameter named bList is assigned to the argument named listB . Nothing is passed and assigned to the argument named listC . Furthermore, the two parameters thatare passed through assignment to the named arguments are passed in reverse order relative to the definition of those arguments in the function definition.

Hopefully this explanation along with the code in Listing 4 and the output in Figure 5 will tell you what you need to know about using keyword function arguments.

I also recommend that you create a visualization for the code in Listing 4 and step through the program one instruction at a time. As you do that, pay attention tothe movements of the red and green arrows on the left, the diagram on the right,and the printed material at the bottom. That should help you to better understand the concept of keyword arguments.

Variable-length arguments

The program in Listing 5 defines a function named listModifier with one required argument ( listA ) and a syntax that supports an arbitrary number of arguments ( *wxyz ). (Note the asterisk, *, immediately to the left of wxyz .)

The program in Listing 5 illustrates variable-length arguments .

Listing 5 . Illustration of variable-length arguments.
# Illustrates variable-length arguments #--------------------------------------------------------------------------def listModifier(listA,*wxyz): """Illustrates variable-length arguments"""print("In listModifier") #append a numeric value to the list referenced by required argument listAlistA.append(1.00001)#append increasing numeric values to lists referenced by other parameters count = 2for ref in wxyz: ref.append(1.00001 * count)count += 1 #end for loop here return #return nothing#End function definition aList = ["ab","cd","ef"]bList = ["The","old","list"] cList = ["This old house"]dList = ["is falling down"] print("aList = " + str(aList))print("bList = " + str(bList)) print("cList = " + str(cList))print("dList = " + str(dList)) print("Call listModifier")listModifier(aList,bList,cList,dList) print("Back from listModifier")print("aList = " + str(aList)) print("bList = " + str(bList))print("cList = " + str(cList)) print("dList = " + str(dList))

The code in Listing 5 produces the output shown in Figure 6 .

Figure 6 . Output produced by the code in Listing 5.
aList = ['ab', 'cd', 'ef'] bList = ['The', 'old', 'list']cList = ['This old house'] dList = ['is falling down']Call listModifier In listModifierBack from listModifier aList = ['ab', 'cd', 'ef', 1.00001]bList = ['The', 'old', 'list', 2.00002] cList = ['This old house', 3.00003]dList = ['is falling down', 4.00004]

The first thing that you should pay attention to is the syntax for defining variable-length arguments in the function named listModifier in Listing 5 . The syntax consists of an asterisk (*) followed by an arbitrary argument name. As mentioned earlier, the function definition in Listing 5 consists of a required argument ( listA ) followed by the syntax for a variable-length group of arguments ( *wxyz ).

Questions & Answers

where we get a research paper on Nano chemistry....?
Maira Reply
what are the products of Nano chemistry?
Maira Reply
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
Google
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
Hafiz Reply
revolt
da
Application of nanotechnology in medicine
what is variations in raman spectra for nanomaterials
Jyoti Reply
I only see partial conversation and what's the question here!
Crow Reply
what about nanotechnology for water purification
RAW Reply
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
Brian Reply
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?
LITNING Reply
what is a peer
LITNING Reply
What is meant by 'nano scale'?
LITNING Reply
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 ?
Bob Reply
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?
Damian Reply
what king of growth are you checking .?
Renato
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
?
Kyle
yes I'm doing my masters in nanotechnology, we are being studying all these domains as well..
Adin
why?
Adin
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
Smarajit 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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