python-IOError：[Errno 32] self.subp_.stdin.flush（）中的管道损坏

Question

def send( self, sendStr, detailedTrace=False ):
    trace = t4 if detailedTrace else t1
    trace( self.tag_, 'send: %r' %( sendStr ))
    self.subp_.stdin.write( sendStr )
    self.subp_.stdin.flush()

[Errno 32]管道破损