python subprocess.Popen 非阻塞

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1、非阻塞设置subprocess.Popen(args, stdout=subprocess.PIPE,stderr=subprocess.PIPE)

def non_block_read(output):
fd = output.fileno()
fl = fcntl.fcntl(fd, fcntl.F_GETFL)
fcntl.fcntl(fd, fcntl.F_SETFL, fl | os.O_NONBLOCK)
try:
return output.read()
except:
return ""#while proc.poll()!=0 :
# if proc.poll() is not None:
# print proc.poll()
# else:
# pass
#time.sleep(20)
non_block_read(proc.stdout)
print proc.stdout.read()
while proc.poll() is None:
passprint proc.poll()
print proc.stdout.read()