On 8/1/2018 4:11 PM, cseber...@gmail.com wrote:
I can run python3 interactively in a subprocess w/ Popen but
if I sent it text, that throws an exception, the process freezes
instead of just printing the exception like the normal interpreter..
why? how fix? Here is my code below.
(I suspect when there is an exception, there is NO output to stdin so that
the problem is the line below that tries to read from stdin never finishes.
Maybe I need a different readline that can "survive" when there is no output
and won't block?)
....
import subprocess
interpreter = subprocess.Popen(['python3', '-i'],
stdin = subprocess.PIPE,
stdout = subprocess.PIPE,
stderr = subprocess.PIPE)
while True:
exp = input(">>> ").encode() + b"\n"
interpreter.stdin.write(exp)
interpreter.stdin.flush()
print(interpreter.stdout.readline().strip())
subprocess is not meant for interaction through the pipes. That is why,
I have been told, IDLE uses a socket for interaction. Multiprocess is
apparently better suited for interaction without resorting to a socket.
interpreter.stdin.close()
interpreter.terminate()
--
Terry Jan Reedy
--
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