<< Chapter < Page Chapter >> Page >

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.

Congratulations

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.

Miscellaneous

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
Disclaimers:

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.

-end-

Questions & Answers

what is mutation
Janga Reply
what is a cell
Sifune Reply
how is urine form
Sifune
what is antagonism?
mahase Reply
classification of plants, gymnosperm features.
Linsy Reply
what is the features of gymnosperm
Linsy
how many types of solid did we have
Samuel Reply
what is an ionic bond
Samuel
What is Atoms
Daprince Reply
what is fallopian tube
Merolyn
what is bladder
Merolyn
what's bulbourethral gland
Eduek Reply
urine is formed in the nephron of the renal medulla in the kidney. It starts from filtration, then selective reabsorption and finally secretion
onuoha Reply
State the evolution relation and relevance between endoplasmic reticulum and cytoskeleton as it relates to cell.
Jeremiah
what is heart
Konadu Reply
how is urine formed in human
Konadu
how is urine formed in human
Rahma
what is the diference between a cavity and a canal
Pelagie Reply
what is the causative agent of malaria
Diamond
malaria is caused by an insect called mosquito.
Naomi
Malaria is cause by female anopheles mosquito
Isaac
Malaria is caused by plasmodium Female anopheles mosquitoe is d carrier
Olalekan
a canal is more needed in a root but a cavity is a bad effect
Commander
what are pathogens
Don Reply
In biology, a pathogen (Greek: πάθος pathos "suffering", "passion" and -γενής -genēs "producer of") in the oldest and broadest sense, is anything that can produce disease. A pathogen may also be referred to as an infectious agent, or simply a germ. The term pathogen came into use in the 1880s.[1][2
Zainab
A virus
Commander
Definition of respiration
Muhsin Reply
respiration is the process in which we breath in oxygen and breath out carbon dioxide
Achor
how are lungs work
Commander
where does digestion begins
Achiri Reply
in the mouth
EZEKIEL
what are the functions of follicle stimulating harmones?
Rashima Reply
stimulates the follicle to release the mature ovum into the oviduct
Davonte
what are the functions of Endocrine and pituitary gland
Chinaza
endocrine secrete hormone and regulate body process
Achor
while pituitary gland is an example of endocrine system and it's found in the Brain
Achor
what's biology?
Egbodo Reply
Biology is the study of living organisms, divided into many specialized field that cover their morphology, physiology,anatomy, behaviour,origin and distribution.
Lisah
biology is the study of life.
Alfreda
Biology is the study of how living organisms live and survive in a specific environment
Sifune
Got questions? Join the online conversation and get instant answers!
Jobilize.com Reply

Get Jobilize Job Search Mobile App in your pocket Now!

Get it on Google Play Download on the App Store Now




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