Using wxPython
We’ve
always found that the best way to learn is by doing and then
experimenting and tweaking with what’s been done. So download
and install wxPython, fire up your favorite text
editor[1] and get ready to
play along as you read the next few sections.
A simple example
Familiarize yourself with this little wxPython
program, and refer back to it as you read through the explanations
that follow:
from wxPython.wx import *
class MyApp(wxApp):
def OnInit(self):
frame = wxFrame(NULL, -1, "Hello from wxPython")
frame.Show(true)
self.SetTopWindow(frame)
return true
app = MyApp(0)
app.MainLoop()When you run this code, you should see a Window appear similar to Figure 20.6.
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The first thing to do is import the entire
wxPython library with the from
wxPython.wx
import
* statement. This is common practice for
wxPython programs, but you can obviously perform
more restrictive imports if you prefer.
Every wxPython application needs to derive a class
from wxApp and provide an
OnInit method for it. The framework calls this
method as part of its initialization sequence, and the usual purpose
of OnInit is to create the windows and essentials
necessary for the program to begin operation. In the sample you
created a frame with no parent, with a title of “Hello from
wxPython" and then showed it. We could also have specified a position and size for the frame ...
