import os
mpid=os.getpid()
def run(code): return os.popen(code).read()
def sub(code):
spid=os.fork()
if os.getpid()!=mpid:
# son gogogo
run(code)
else:
return spid
spid=sub("aplay muisc.wav")
run("arecord -r 16000 -t wav -d 20 -v out.wav")
run("kill -9 %d"%spid)