Josh Rosenberg <shadowranger+pyt...@gmail.com> added the comment:

I've only got 3.7.1 Ubuntu bash on Windows (also amd64) immediately available, 
but I'm not seeing a hang, nor is there any obvious memory leak that might 
eventually lead to problems (memory regularly drops back to under 10 MB shared, 
24 KB private working set). I modified your code to add a sys.stdout.flush() 
after the write so it would actually echo the dots as they were written instead 
of waiting for a few thousand of them to build up in the buffer, but otherwise 
it's the same code.

Are you sure you're actually hanging, and it's not just the output getting 
buffered?

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nosy: +josh.r

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<https://bugs.python.org/issue35866>
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