For 2023 - we are now fully retired from IT training.
We have made many, many friends over 25 years of teaching about Python, Tcl, Perl, PHP, Lua, Java, C and C++ - and MySQL, Linux and Solaris/SunOS too. Our training notes are now very much out of date, but due to upward compatability most of our examples remain operational and even relevant ad you are welcome to make us if them "as seen" and at your own risk.
Lisa and I (Graham) now live in what was our training centre in Melksham - happy to meet with former delegates here - but do check ahead before coming round. We are far from inactive - rather, enjoying the times that we are retired but still healthy enough in mind and body to be active!
I am also active in many other area and still look after a lot of web sites - you can find an index ((here))
Add a friendly front end with Tk
With a Tk Graphic User Interface, you can add a friendly look and feel to an application running on your workstation if it's written in Tcl (Tcl/Tk
), Perl (Perl/Tk
) or Python (TkInter
Whichever language you build your GUI on to, you'll want to remember
1. Create your components (known as widgets) as your application starts - you'll have buttons and labels and entry boxes and frames ... and associated with some of them such as the buttons you'll have commands that are to be run later on when the button is pressed
2. Use a geometry manager to position the widgets within the application window(s) and to define how they're to react when the window is resized
3. Define any extra events - things that are to happen when the user interacts with the GUI - in addition to the commands that you specified as you defined the components.
Once you've created the components, added extra events, and placed the components you can sit back and let the application run in what's known as the event loop
. That's a loop - and it can be an infinite loop - that waits for the next event, and when it's received, you process it.
The source code of the example used to illustrate this item is only a few hundred bytes long and much of that is comments
. You can view the source code
if you wish. (written 2006-02-08, updated 2006-06-09)
Associated topics are indexed as below, or enter http://melksh.am/nnnn for individual articlesY205 - Further uses of Python 
Python engines - (2005-01-26) 
Python modules. The distribution, The Cheese Shop and the Vaults of Parnassus. - (2006-06-05) 
Python Qt, wX, TkInter, and Jython - training?? - (2007-01-16) 
Tk locks up - 100% c.p.u. on a simple program (Tcl, Perl, Python) - (2007-09-09) 
Python in an afternoon - a lecture for experienced programmers - (2008-06-01)T216 - Tcl/Tk - Introduction to Tk 
Error: Cant read xxxxx: no such variable (in Tcl Tk) - (2009-02-14) 
Tcl + Tk (Wish) - an introduction and revision example - (2013-11-15) 
Using Object Oriented Tcl and the Tk toolkit together - real life example - (2015-03-12)P307 - Perl/Tk 
The magic of -textvariable - (2006-02-08) 
Perl/Tk real time display - (2006-02-10) 
(Perl) Callbacks - what are they? - (2006-05-30) 
Callbacks - a more complex code sandwich - (2007-08-19) 
Expect in Perl - a short explanation and a practical example - (2010-10-22)
Some other Articles
Should we cruise around the world?Storing a regular expression in a perl variableAdd a friendly front end with TkTwice is a co-incidence and three times is a patternFinding where the disc space has goneNOT Gone phishingKey facts - SQL and MySQLDanny and Donna are getting married
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This is a page archived from The Horse's Mouth at
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