Eryk Sun added the comment:
> Now I can read from the "R" pipes with 0 problems (getting the error
> and output streams)
The pipe handles are inherited by waitfor.exe, just as before. You'll find that
reading to EOF will block just as it does when using subprocess.PIPE with
communicate(). For example:
stderr = open(errPipeR, 'r')
err = stderr.read()
The above stderr.read() will return when waitfor.exe either exits or gets
terminated.
> and proc.communicate exits as soon as the called process exits
> (4 seconds).
proc.stdout and proc.stderr are None in this case, so all communicate() can do
is write to proc.stdin, if there's input text, and then wait() for the process
to exit.
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<https://bugs.python.org/issue31447>
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