Python sleep doesn't work right in a loop?

[Steve Holden]

ritterhaus at yahoo.com wrote:
> Nope. Does't work. Running Python 2.3.4 on Debian, Linux kernel 2.6.
> This is actually test code for a larger project...
> 
> # flash the selected wx.TextControl
> 
> for flasher in range(4):
>     self.textField.SetBackgroundColour(255, 0, 0)
>     time.sleep(0.8)
>     self.textField.SetBackgroundColour(255, 255, 223)
>     time.sleep(0.8)
> 
> Even when I add an explicit call to repaint the TextCtrl between each
> sleep, things appear to be 'queued' until after the loop is fnished.
> Very bizarre.
> 
Not at all, but completely unrelated to your initial question.

You need to use a specific call before each sleep to tell wxPython to 
update the display, since the sleep doesn't give control back to the 
display subsystem. I think the call you need is app.Yield(), but the 
docs will confirm that.

regards
  Steve
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