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Both python2 and python3 Popen have a well-know issue with deadlock when stdout=subprocess.PIPE is used. Search for the second instance of word deadlock on this page:

https://docs.python.org/3/library/subprocess.html

Both python2 and python3 Popen have a well-know well-known issue with deadlock when stdout=subprocess.PIPE is used. Search for the second instance of word deadlock on this page:

https://docs.python.org/3/library/subprocess.html