From today's training - a private course that was brief Python revision followed by an introduction to GUIs (in the form of wxPython ...

I started with a generic intordcution to GUIs ... written in the form of a source code file in Python:

  # principles of a GUI
  #
  # Provides a "Framework" and "Helpers"
  #
  # (somewhere here - load / initialse model)
  # 1. Define components ("widgets")
  # 2. Define a geometry ("layout")
  # 3. Define my events
  #
  # BEFORE you
  #
  # (4. Display initial view)
  # 5. Await an event
  # 6. Process that event
  # 7. go to step 5

and then I went on to add real code into each of the sections. Here is the implementation for each step:

# Provides a "Framework" and "Helpers"
  import wx

# load / initialse model
  import mymodel

# Create an empty shell for the various els.
  app = wx.PySimpleApp()
  class RailStationApp(wx.Frame):
    def __init__(this):
      wx.Frame.__init__(this, None,wx.ID_ANY,"About rail places", (600,200))

# 1. Define components ("widgets")
  this.myWoof = wx.Button(this,1,"Gypsy")
  this.myYap = wx.Button(this,2,"Billy")

# 2. Define a geometry ("layout")
  this.geom = wx.BoxSizer(wx.VERTICAL)
  this.geom.Add(this.myWoof)
  this.geom.Add(this.myYap)
  this.SetSizer(this.geom)
  this.SetAutoLayout(1)
  this.geom.Fit(this)

# 3. Define my events
  this.Bind(wx.EVT_BUTTON,this.feed,this.myWoof)
  this.Bind(wx.EVT_BUTTON,this.walk,this.myYap)
  def feed(this,event): print "We are out of Bonios"
  def walk(this,event): print "Peeing down with rain"

# 4. Display initial view
  this.Show(True)

# 5. Await an event
# 6. Process that event
# 7. go to step 5
  app.MainLoop()

There's a few more wrapper and invocation lines - compete template [here] and the full implementation[here].

Having put the rudiments of each step into place, I moved on to ...

Add a label and change event handlers so that feedback appeared within the GUI (see [here].

Add a whole list of data elements and a loop of buttons, with a single event handler working for all of the buttons [here]

And finally switching to use data from my model to load the GUI and present dynamic information [here]

Image - samples of the four application examples

(written 2015-11-30)

 Y207 - wxPython
  [903] Pieces of Python - (2006-10-23)
  [2013] wxPython - Introduction and sample - (2009-01-29)
  [2744] PyQt (Python and Qt) and wxPython - GUI comparison - (2010-04-28)
  [2887] Snow Leopard and Python (that is OS X 10.6 and wxPython) - (2010-07-26)
  [3081] wxPython - simple example to add GUI to a server log file analysis - (2010-12-08)
  [3086] Sizers (geometry control) in a wxPython GUI - a first example - (2010-12-15)
  [3092] wxPython geometry - BoxSizer example - (2010-12-17)
  [3139] Steering our Python courses towards wxPython, SQLite and Django - (2011-01-19)

Q910 - Object Orientation and General technical topics - GUI principles
  [2746] Model - View - Controller demo, Sqlite - Python 3 - Qt4 - (2010-04-29)
  [4258] Keeping you Tkinter display up to date while monitoring - (2014-04-06)

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