[PyQt] Any way to run code before each QThread?

John Ehresman jpe at wingware.com
Mon Jul 16 16:03:51 BST 2018

On 7/15/18 8:19 PM, Ned Batchelder wrote:
> How does Wing wrap the run method?  How does it get a chance to do that?

Wing monkeypatches QThread to replace QThread.__init__ with it's own 
callable after the QtCore module is loaded.  Within the __init__ 
replacement, the .run method on the new instance is replaced by a 
replacement run callable that calls settrace before calling the saved 
run method.  This is done because user code does override the run method 
in subclasses of QThread and monkeypatching in __init__ captures the 
overridden run method in most cases.  I've attached a snippet of Wing's 
code; it's an extract and won't run as is but hopefully it's helpful.

This is an ugly hack and there is code that it won't work for, but it 
should work most of the time.


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