wxPython threading wxGauge - multithreading

Question

I'm trying to learn about threading with wxPython, so I tried to make this simple example work, but it seems that the progress bar updates happen after the "long process" is done. Could anyone tell me why this is not working ?
#!/usr/bin/env python
import time
import wx
from wx.lib.pubsub import Publisher as pub
class Window(wx.Frame):
def __init__(self):
wx.Frame.__init__(self, None, title="wxGauge")
self.sizer = wx.BoxSizer(wx.VERTICAL)
self.gauge = wx.Gauge(self, range=10)
self.btn = wx.Button(self, label="Start process")
self.sizer.Add(self.gauge)
self.sizer.Add(self.btn)
self.SetSizerAndFit(self.sizer)
pub.subscribe(self.update, "update")
self.btn.Bind(wx.EVT_BUTTON, self.OnClick)
self.Show()
def update(self, msg):
self.gauge.SetValue(msg.data)
def OnClick(self, evt):
for i in range(10):
wx.CallAfter(pub.sendMessage, "update", i + 1)
time.sleep(1)
if __name__ == '__main__':
app = wx.App()
Window()
app.MainLoop()

Answer 1

It is because of the usage of "CallAfter". If call "sendMessage" in this way, it is actually called after the event handler finished.
You can try it in this way:
for i in range(10):
pub.sendMessage("update", i+1)
time.sleep(1)
EDIT:
put this "sendMessage" out of the event handler.
import time
import wx
from wx.lib.pubsub import Publisher as pub
class Window(wx.Frame):
def __init__(self):
wx.Frame.__init__(self, None, title="wxGauge")
self.sizer = wx.BoxSizer(wx.VERTICAL)
self.gauge = wx.Gauge(self, range=10)
self.btn = wx.Button(self, label="Start process")
self.sizer.Add(self.gauge)
self.sizer.Add(self.btn)
self.SetSizerAndFit(self.sizer)
pub.subscribe(self.update, "update")
self.btn.Bind(wx.EVT_BUTTON, self.OnClick)
self.Bind(wx.EVT_TIMER, self.TimerHandler)
self.timer = wx.Timer(self)
self.gaugeIndex = 0
self.Show()
def TimerHandler(self, event):
self.gaugeIndex += 1
pub.sendMessage("update", self.gaugeIndex)
if self.gaugeIndex == 10:
self.timer.Stop()
def update(self, msg):
self.gauge.SetValue(msg.data)
def OnClick(self, evt):
self.timer.Start(1000)
if __name__ == '__main__':
app = wx.App(redirect=False)
Window()
app.MainLoop()