使用Python的交互式输入输出

在Linux上针对此问题的两种解决方案：

第一个是使用文件将输出写入其中，并同时读取输出：

from subprocess import Popen, PIPEfw = open("tmpout", "wb")fr = open("tmpout", "r")p = Popen("./a.out", stdin = PIPE, stdout = fw, stderr = fw, bufsize = 1)p.stdin.write("1n")out = fr.read()p.stdin.write("5n")out = fr.read()fw.close()fr.close()

第二，正如JF Sebastian提供的那样，是使用fnctl模块使p.stdout和p.stderr管道不阻塞：

import osimport fcntlfrom subprocess import Popen, PIPE  def setNonBlocking(fd):    """    Set the file description of the given file descriptor to non-blocking.    """    flags = fcntl.fcntl(fd, fcntl.F_GETFL)    flags = flags | os.O_NonBLOCK    fcntl.fcntl(fd, fcntl.F_SETFL, flags)p = Popen("./a.out", stdin = PIPE, stdout = PIPE, stderr = PIPE, bufsize = 1)setNonBlocking(p.stdout)setNonBlocking(p.stderr)p.stdin.write("1n")while True:    try:        out1 = p.stdout.read()    except IOError:        continue    else:        breakout1 = p.stdout.read()p.stdin.write("5n")while True:    try:        out2 = p.stdout.read()    except IOError:        continue    else:        break