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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

where we get a research paper on Nano chemistry....?
Maira Reply
what are the products of Nano chemistry?
Maira Reply
There are lots of products of nano chemistry... Like nano coatings.....carbon fiber.. And lots of others..
Even nanotechnology is pretty much all about chemistry... Its the chemistry on quantum or atomic level
no nanotechnology is also a part of physics and maths it requires angle formulas and some pressure regarding concepts
Preparation and Applications of Nanomaterial for Drug Delivery
Hafiz Reply
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.
yes that's correct
I think
Nasa has use it in the 60's, copper as water purification in the moon travel.
nanocopper obvius
what is the stm
Brian Reply
is there industrial application of fullrenes. What is the method to prepare fullrene on large scale.?
industrial application...? mmm I think on the medical side as drug carrier, but you should go deeper on your research, I may be wrong
How we are making nano material?
what is a peer
What is meant by 'nano scale'?
What is STMs full form?
scanning tunneling microscope
how nano science is used for hydrophobicity
Do u think that Graphene and Fullrene fiber can be used to make Air Plane body structure the lightest and strongest. Rafiq
what is differents between GO and RGO?
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
analytical skills graphene is prepared to kill any type viruses .
Any one who tell me about Preparation and application of Nanomaterial for drug Delivery
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.
how did you get the value of 2000N.What calculations are needed to arrive at it
Smarajit Reply
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