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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

How we are making nano material?
what is a peer
What is meant by 'nano scale'?
What is STMs full form?
scanning tunneling microscope
what is Nano technology ?
Bob Reply
write examples of Nano molecule?
The nanotechnology is as new science, to scale nanometric
nanotechnology is the study, desing, synthesis, manipulation and application of materials and functional systems through control of matter at nanoscale
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
How can I make nanorobot?
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
how can I make nanorobot?
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
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