Communicate Multiple Times With A Subprocess In Python

This question is NOT a duplicate of Communicate multiple times with a process without breaking the pipe? That question is solved because its use case allows inputs to be sent toge

Solution 1:

Basicly Non-blocking read on a subprocess.PIPE in python

Set the proc pipes (proc.stdout, proc.stdin, ...) to nonblocking mode via fnctl and then write/read them directly.

You might want to use epoll or select via the select or io modules for more efficiency.

Solution 2:

This turns out to be not very difficult:

proc = subprocess.Popen(['bc'], stdin=subprocess.PIPE, stdout=subprocess.PIPE)
os.write(proc.stdin.fileno(), b'100+200\n')
print(os.read(proc.stdout.fileno(), 4096))