in step b), when I run 'show_pathces.py', it would appear the following bug. I can't find the solution about this bug?
QObject:: moveToThread: Current thread (0x1e60d60) is not the object's thread (0x2e6dca0). Cannot move to target thread (0x1e60d60)

I also want to know, whether the 'show_patches.py' is for data argument? is it necessary to run this code? And are there any other considerations when I run your code in Python 3？