There are a couple of minor tweaks you can make to get this working. First is to disable buffered output in the child using the -u
option. Second is to send a newline character along with the user-inputted message to the child process, so that the raw_input
call in the child completes.
main.py
import subprocess
# We use the -u option to tell Python to use unbuffered output
p = subprocess.Popen(['python','-u', 'subproc.py'],
stdin=subprocess.PIPE,
stdout=subprocess.PIPE)
while True:
s = raw_input('Enter message:')
p.stdin.write(s + "
") # Include '
'
p.stdin.flush()
response = p.stdout.readline()
if response != '':
print "Process response:", response
else:
break
You should also wrap the child process in an infinite loop, or things will break after the first message is sent:
subproc.py
:
while True:
s = raw_input()
print 'Input=',s
Output:
dan@dantop:~$ ./main.py
Enter message:asdf
Process response: Input= asdf
Enter message:asdf
Process response: Input= asdf
Enter message:blah blah
Process response: Input= blah blah
Enter message:ok
Process response: Input= ok
与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…