Return value from thread

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I suggest you instantiate a Queue.Queue before starting the thread, and pass it as one of the thread’s args: before the thread finishes, it .puts the result on the queue it received as an argument. The parent can .get or .get_nowait it at will.

Queues are generally the best way to arrange thread synchronization and communication in Python: they’re intrinsically thread-safe, message-passing vehicles — the best way to organize multitasking in general!-)

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