fcntl，select，asyncproc不会在这种情况下帮助。
不管使用什么操作系统，一种可靠地读取流而不阻塞的可靠方法是使用Queue.get_Nowait()：
import sys
from subprocess import PIPE, Popen
from threading import Thread
try:
from queue import Queue, Empty
except ImportError:
from Queue import Queue, Empty # python 2.x
ON_POSIX = 'posix' in sys.builtin_module_names
def enqueue_output(out, queue):
for line in iter(out.readline, b''):
queue.put(line)
out.close()
p = Popen(['myprogram.exe'], stdout=PIPE, bufsize=1, close_fds=ON_POSIX)
q = Queue()
t = Thread(target=enqueue_output, args=(p.stdout, q))
t.daemon = True # thread dies with the program
t.start()
# ... do other things here
# read line without blocking
try: line = q.get_Nowait() # or q.get(timeout=.1)
except Empty:
print('no output yet')
else: # got line
# ... do something with line
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