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For 2021 - online Python 3 training - see ((here)).

Our plans were to retire in summer 2020 and see the world, but Coronavirus has lead us into a lot of lockdown programming in Python 3 and PHP 7.
We can now offer tailored online training - small groups, real tutors - works really well for groups of 4 to 14 delegates. Anywhere in the world; course language English.

Please ask about private 'maintenance' training for Python 2, Tcl, Perl, PHP, Lua, etc.
Python GTK - Widget, Packing, Event and Feedback example

Python has a variety of GUIs available ... one of which, GTK, has been getting much more popular of late. As is common with many of the GUIs in Pyton and other languages, you'll typically write an application as follows:
  • Initial code, defining
    1. Widgets
    2. Layout (Geometry)
    3. Events
  • A main loop, which collects actions and events


Within the GUI, each widget must be defined, packed into the appropriate piece of Geometry, and shown (and the box and window containers also need to be shown) and - there you are - a simple GUI.

As you use the GUI, you'll want to provide your user with feedback by altering the text on labels, buttons, and making other widget changes. Slightly surprisingly, you define all the possible actions early on then have your events trigger them as callback functions

The authors of GUI documentation always seem to start with a very very simple "hello world" example, then leap off into some quite extravagant further example, when all you (the programmer) want is a few buttons to perform tasks (and change to show what you've done). Of course, I do know why they make them complicated as they've got dozens of events, scores of widgets and hundreds of facilities they would love you to use.

But I'm going to break from convention today and point you in the direction of a simple Python Gtk example that starts like this:

showing the basic elements of a window, a box, and a couple of widgets. Events are defined on the first two buttons that change the text and the quit button is (!!) programmed to quit the GUI.


As you run the GUI, you'll see the display counting up the number of times each button is pressed: - thus completing that vital feedback element that you'll need in every GUI but never seems to be described in the manual until a footnote in chapter 5 or 6.


Complete (commented!) source code is here where you'll find further examples as well.
(written 2007-04-09, updated 2011-10-13)

 
Associated topics are indexed as below, or enter http://melksh.am/nnnn for individual articles
Y212 - Python - Code testing, patterns, profiles and optimisation.
  [235] Preparation for a day's work - (2005-03-04)
  [1146] __new__ v __init__ - python constructor alternatives? - (2007-04-14)
  [1148] Python decorators - wrapping a method call in extra code - (2007-04-15)
  [1555] Advanced Python, Perl, PHP and Tcl training courses / classes - (2008-02-25)
  [2123] Using Python with OpenOffice - (2009-04-09)
  [2616] Defining a static method - Java, Python and Ruby - (2010-02-01)
  [3441] Pressing ^C in a Python program. Also Progress Bar. - (2011-09-15)
  [3442] A demonstration of how many Python facilities work together - (2011-09-16)
  [3464] Passing optional and named parameters to python methods - (2011-10-04)
  [3478] Testing your Python classes with the unittest package - how to - (2011-10-14)
  [3658] Using Make for a distribution - (2012-03-17)
  [4090] Test Driven Development in Python - Customer Comes First - (2013-05-16)
  [4326] Learning to program - comments, documentation and test code - (2014-11-22)
  [4344] Python base and inherited classes, test harness and unit testing - new examples - (2014-12-07)
  [4446] Combining tests into suites, and suites into bigger suites - Python and unittest - (2015-03-01)
  [4470] Testing in Python 3 - unittest, doctest and __name__ == __main__ too. - (2015-04-21)
  [4538] Flask and unittest - hello web app test world - (2015-10-15)
  [4540] Unittest of a Flask application including forms - (2015-10-15)
  [4542] The principle of mocking - and the Python Mock package - (2015-10-17)
  [4617] Pytest - starting example - (2016-01-07)
  [4618] Pytest - second example beyond hello world - (2016-01-08)
  [4716] Profiling your Python program - (2016-11-01)

Y209 - Python GTK.

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