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Avoiding the quote problem

Because this is such a common problem, and because the escape solution is so ugly and difficult to read, Python gives us another way to deal withquotes inside of quotes. This solution, shown in Figure 6 , is the use of single and double quotes in combination.

Figure 6 . Avoiding the quote problem.
>>>print('Richard "Dick" Baldwin') Richard "Dick" Baldwin>>>

In Python, double quotes can be included directly in strings that are surrounded by single quotes, and single quotes can be included directly instrings that are surrounded by double quotes. This is much easier to read than the solution that requires you to place a lot of backslash characters insideyour string.

List of escape sequences

Escape sequences are a staple of modern computer programming and there is a lot of consistency from one language to the next. A list of the escape sequencesthat are honored by Python 3 is available in the Python Language Reference -- 2.4.1. String and Bytes literals .

More ways to span lines

Just when you thought that you had seen it all, I am going to show you three more ways (two new and one not so new) to span multiple lines with strings. One of them is shown in Figure 7 .

End the line with a backslash

Figure 7 . End the line with a backslash.
>>>print("Richard \ Baldwin")Richard Baldwin>>>

As shown in Figure 7 , the use of a backslash at the end of the line makes it possible to continue the string on anew line. However, the backslash is not included in the output, and there is no newline character in the output.

Not restricted to strings

The backslash can be used at the end of a line to cause that line to be continued on the next line whether inside a string or not. This isillustrated in the review module following this module.

A form of concatenation

When used in this way with a string, the backslash at the end of the line becomes a form of string concatenation. The portions of the strings on each ofthe input lines are concatenated to produce a single line containing both parts of the string in the output.

I will have more to say about string concatenation later in this module.

Use the \n escape sequence

This isn't really new, but it so important that I decided to repeat it here for emphasis. As shown in Figure 8 , the inclusion of "\n" inside the string caused the cursor to advance to a new line following my first name and printedmy last name on the new line.

Figure 8 . Use the \n escape sequence.
>>>print("Richard \nBaldwin") RichardBaldwin>>>

This is the common form of the newline escape sequence typically used in C, C++, and Java.

Combine backslash and \n

The code in Figure 9 shows how to combine the backslash at the end of the line with a newline character placedthere to cause the output to closely resemble the input.

Figure 9 . Combine backslash and \n.
>>>print("Richard \n\ Baldwin")Richard Baldwin>>>

String concatenation

To concatenate two strings means to hook them together end-to-end, thus producing a new string that is the combination of the two.

Literal string concatenation

You can cause literal strings to be concatenated just by writing one adjacent to the other as shown in Figure 10 .

Questions & Answers

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
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
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
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
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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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