[PyQt] Python has stopped working in PyQt application

[redstone-cold]

code here 
https://bpaste.net/show/7a73adda2a4b


After it  running for about half a minute ,then close the window, then the "Python has stopped working" dialog pops up(you had better try more than once. )
 I wonder why this happen ?any solution to this ?


(code format become messy, so I posted again  )



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