execution timing of the method QWidget.show()

[Barry]

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Barry

> On 8 Jul 2020, at 21:17, artis.paintre at gmail.com wrote:
> 
> I might be wrong but since I have not found anygroup newsgroup dedicated to PyQt5.
> 
> My small program is expected to show a window GUI for 4 seconds before changing it, so I naively coded:
> 
> "...
> ...
> # codes to set up the GUI
> ...
> F0.show() # F0 being a QMainWindow object
> time.sleep(4)
> ...
> # codes to change the GUI set up
> ...
> F0.update() 
> 
> "
> 
> What happens: The a blank window is displayed, freezes for 4 seconds then second set up is displayed, the original set up is not displayed.
> 
> Why is not the original set up displayed? 
> 
> Obviously, if I remove the codes for the second set up, and the "time.sleep(4)" instruction, the original set up is displayed immediatly after I launch the execution.
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