<< Chapter < Page
  Itse 1359 introduction to     Page 3 / 7
Chapter >> Page >

Numbers

Numbers can be any of the digit characters between and including 0 and 9.

Style

Click PEP 8 -- Style Guide for Python Code to learn more about how to create identifiers for variables and other programming elements as well.

Let's program

Start the interactive Python environment

The first thing that you need to do is to start the interactive programming environment. If you have forgotten how to do that, see the module titled Itse1359-1010-Getting Started .

Create and use some variables

The interactive fragment shown in Figure 1 :

  • Creates two variables named x and y,
  • Populates them by assigning values of 6 and 5 to them respectively
  • Adds their values together to produce the sum value of 11.
Figure 1 . Create and use some variables.
>>>x=6 # create and populate x>>>y=5 # create and populate y>>>x+y # add x to y and display the sum 11>>>

Back to the pigeonholes

Using the informal jargon from an earlier paragraph, two pigeonholes are established in memory and are given nicknames of x and y.

The assignment operator

Integer values of 6 and 5 are stored in the two pigeonholes using the assignment operator (=).

The use of the assignment operator in this fashion causes the value of its right operand to be stored in the pigeonhole identified by its left operand .

What is an operand ?

If you don't recognize the use of the term operand, see the earlier module titled Itse1359-1020-Numbers for an explanation.

In this case, the right operands of the assignment operators are literal numeric values .

The left operands of the assignment operators are the nicknames identifying the two memory locations that constitute the variables named x and y.

Addition of variables

The values are retrieved from eachpigeonhole and added together in the third line of code. The result of the addition (11) is displayed as output from the expression x+y .

Assigning the same value to several variables

Python allows you to assign the same value to several variables, causing them to come into existence (begin to occupy memory) at the same time if necessary

Consider the interactive fragment shown in Figure 2 .

Figure 2 . Assigning the same value to several variables.
>>>a=b=c=10 # assign 10 to several variables>>>a+b+c # add them together 30>>>a=b=c=20 # assign 20 to same variables>>>a+b+c # add them together 60>>>

Create three variables

The first line of code in Figure 2 creates three variables named a , b , and c , and assigns a value of 10 to each of them.

They are then added together, in the second line of code, to produce an output value of 30.

Assign different values

The fourth line of code assigns the value of 20 to the same three variables, replacing what was previously there with the new value. Againthey are added together, this time producing an output value of 60.

A more comprehensive explanation

Pigeonhole explanations are good for starters, but let's move on to a more comprehensive and technically correct explanation.

According to the Python gurus, everything (or at least almost everything) in Python is an object. I indicated earlier that data values are stored in variables.In reality, that is not the case. Figure 3 shows the truth about pigeonholes, variables, and objects.

Questions & Answers

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
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
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
anyone know any internet site where one can find nanotechnology papers?
Damian Reply
research.net
kanaga
sciencedirect big data base
Ernesto
Introduction about quantum dots in nanotechnology
Praveena Reply
hi
Loga
what does nano mean?
Anassong Reply
nano basically means 10^(-9). nanometer is a unit to measure length.
Bharti
how did you get the value of 2000N.What calculations are needed to arrive at it
Smarajit Reply
Privacy Information Security Software Version 1.1a
Good
Got questions? Join the online conversation and get instant answers!
Jobilize.com Reply

Get the best Algebra and trigonometry course in your pocket!





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
Google Play and the Google Play logo are trademarks of Google Inc.

Notification Switch

Would you like to follow the 'Itse 1359 introduction to scripting languages: python' conversation and receive update notifications?

Ask