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Figure 1 . Python 3.4.1 Shell.

Missing image

What is a GUI ?

GUI is an acronym for Graphical User Interface . The IDLE window is a GUI. It can be used for interactive Python programming.

To make it go away when you are finished, simply click the button in the upper-right corner that is labeled with an X.

The Python (command line) selection

When I select the Python (command line) item in the menu mentioned above , I get essentially the same thing as the GUI, but in a "black screen" window commonly referred toas a command-line window as shown in Figure 2 .

Figure 2 . Python (command line) window.

Missing image

The command-line window

This window can also be used for interactive Python programming in much the same way that the Python Shell can be used. Each has some practical advantagesand disadvantages.

To make this screen go away, click the X in the upper right-hand corner.

Note: In addition to IDLE, many Python development environments are available on the web - some free and some not free. My personal favorite is thefree Wing IDE . I have asked that it also be installed in the computer labs on the Northridge campus.

Your first (interactive) Python program

You can use IDLE, Wing (if it is available) , or the command line editor to write and execute your first Pythonprogram.

Hello World in Python

As has become the custom in programming circles, we will make our first Python program one that displays "Hello World" on the computer screen. We willwrite and execute it interactively.

The Python prompt >>>

The three right-angle brackets that you see in both of the interactive screens (>>>) make up the Python interactive prompt. When the cursor is blinking to the right of that prompt, you can enter a Python programming statementinteractively.

Let's do it

Type the following text to the right of the Python prompt and press the Enter key:

print("Hello World")

The print function :

Prior to the release of version 3.0, print was a statement instead of a function and was executed without the parentheses.

If all goes well, your interactive Python screen should then look something like Figure 3 .

Figure 3 . Python Hello World.

Missing image

Pay particular attention to the line that reads Hello World following your entry. That is the output from your program.


You have just written (and executed) your first (interactive) Python program, and possibly your first computer program as well. Not only that, you only had to type oneline of code to write and execute your program.

Note that your entire program, the output from your program, and a new prompt are all shown in Figure 3 .

Python is ready for more

Python has provided a new prompt so that you can expand your program, or write another one.


This section contains a variety of miscellaneous information.

Housekeeping material
  • Module name: Itse1359-1010-Getting Started
  • File: Itse1359-1010.htm
  • Published: 10/13/14
  • Revised: 01/31/16

Financial : Although the Connexions site makes it possible for you to download a PDF file for thismodule at no charge, and also makes it possible for you to purchase a pre-printed version of the PDF file, you should beaware that some of the HTML elements in this module may not translate well into PDF.

I also want you to know that, I receive no financial compensation from the Connexions website even if you purchase the PDF version of the module.

In the past, unknown individuals have copied my modules from cnx.org, converted them to Kindle books, and placed them for sale on Amazon.com showing me as the author. Ineither receive compensation for those sales nor do I know who does receive compensation. If you purchase such a book, please beaware that it is a copy of a module that is freely available on cnx.org and that it was made and published withoutmy prior knowledge.

Affiliation : I am a professor of Computer Information Technology at Austin Community College in Austin, TX.


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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