What is “thread local storage” in Python, and why do I need it?

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In Python specifically, how do variables get shared between threads?

Although I have used threading.Thread before I never really understood or saw examples of how variables got shared. Are they shared between the main thread and the children or only among the children? When would I need to use thread local storage to avoid this sharing?

I have seen many warnings about synchronizing access to shared data among threads by using locks but I have yet to see a really good example of the problem.

Thanks in advance!





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