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Writing numpy array data to a pipe opened with Popen

I am trying to write a numpy array data to a pipe opened using subprocess.Popen in Python 3.4 and numpy 1.10.4. Here is the code: import numpy import subprocess myArray = ...
GitHub

subprocess: Popen.kill() + Popen.communicate() is blocking until all processes using the pipe close the pipe #82388

I would expect that the second communicate () call completes immediately since we just killed the process: Windows knows that child process is dead, Python knows that Popen object has been kill, but ...