这不是我第一次遇到这个问题,这真的让我烦恼.每当我使用Python subprocess模块打开管道时,我只能communicate使用它一次,因为文档指定:Read data from stdout and stderr, until end-of-file is reached
proc = sub.Popen("psql -h darwin -d main_db".split(),stdin=sub.PIPE,stdout=sub.PIPE)
print proc.communicate("select a,b,result from experiment_1412;\n")[0]
print proc.communicate("select theta,zeta,result from experiment_2099\n")[0]
这里的问题是,第二次,Python并不开心.实际上,他决定在第一次沟通后关闭文件:
Traceback (most recent call last):
File "a.py", line 30, in <module>
print proc.communicate("select theta,zeta,result from experiment_2099\n")[0]
File "/usr/lib64/python2.5/subprocess.py", line 667, in communicate
return self._communicate(input)
File "/usr/lib64/python2.5/subprocess.py", line 1124, in _communicate
self.stdin.flush()
ValueError: I/O operation on closed file
是否允许多次通信？