Processing key events

The KeyEvent events are generated in any control that accepts keyboard input when a user presses keys on a keyboard. There are three distinct events that occur for a single key press. In this recipe, we will use KeyEvents to create a custom TextCtrl control that can generate a dynamic input suggestion list similar to the suggestions that Google shows when one types into the search box.

How to do it…

You need to do the following:

1. Firstly, for this recipe, we need to include a couple of other modules from the Python standard library, as follows:

   from urllib import urlopen
   import re
   
   from abc import ABCMeta, abstractmethod
   import wx

2. To make the control's suggestion provider extensible, we will first define a simple interface class that will be responsible for providing suggestion options. This is defined as an abstract base class:

   class CompleterDataSource:
       __metaclass__ = ABCMeta
       
       @abstractmethod
       def getSuggestions(self, phrase):
           "...