[PyQt] user interface freezed when using concurrent.futures.ThreadPoolExecutor

[iMath]

I think the user interface shouldn't be freezed when using concurrent.futures.ThreadPoolExecutor here, but it doesn't meet my expectations,anyone can explain why ? any other solutions here to not let user interface freezed?‍


code is here
http://stackoverflow.com/questions/27393533/user-interface-freezed-when-using-concurrent-futures-threadpoolexecutor‍
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