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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

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
Do somebody tell me a best nano engineering book for beginners?
s. Reply
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?
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
types of nano material
abeetha Reply
I start with an easy one. carbon nanotubes woven into a long filament like a string
many many of nanotubes
what is the k.e before it land
what is the function of carbon nanotubes?
I'm interested in nanotube
what is nanomaterials​ and their applications of sensors.
Ramkumar Reply
what is nano technology
Sravani Reply
what is system testing?
preparation of nanomaterial
Victor Reply
Yes, Nanotechnology has a very fast field of applications and their is always something new to do with it...
Himanshu Reply
good afternoon madam
what is system testing
what is the application of nanotechnology?
In this morden time nanotechnology used in many field . 1-Electronics-manufacturad IC ,RAM,MRAM,solar panel etc 2-Helth and Medical-Nanomedicine,Drug Dilivery for cancer treatment etc 3- Atomobile -MEMS, Coating on car etc. and may other field for details you can check at Google
anybody can imagine what will be happen after 100 years from now in nano tech world
after 100 year this will be not nanotechnology maybe this technology name will be change . maybe aftet 100 year . we work on electron lable practically about its properties and behaviour by the different instruments
name doesn't matter , whatever it will be change... I'm taking about effect on circumstances of the microscopic world
how hard could it be to apply nanotechnology against viral infections such HIV or Ebola?
silver nanoparticles could handle the job?
not now but maybe in future only AgNP maybe any other nanomaterials
I'm interested in Nanotube
this technology will not going on for the long time , so I'm thinking about femtotechnology 10^-15
how did you get the value of 2000N.What calculations are needed to arrive at it
Smarajit Reply
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