使用标准子流程模块。您使用subprocess.Popen（）启动该过程，该过程将在后台运行（即与Python程序同时运行）。调用Popen（）时，您可能希望将stdin，stdout和stderr参数设置为subprocess.PIPE。然后，您可以使用返回对象上的stdin，stdout和stderr字段来写入和读取数据。
未经测试的示例代码：
from subprocess import Popen, PIPE
# Run "cat", which is a simple Linux program that prints it's input.
process = Popen(['/bin/cat'], stdin=PIPE, stdout=PIPE)
process.stdin.write(b'Hello\n')
process.stdin.flush()
print(repr(process.stdout.readline())) # Should print 'Hello\n'
process.stdin.write(b'World\n')
process.stdin.flush()
print(repr(process.stdout.readline())) # Should print 'World\n'
# "cat" will exit when you close stdin. (Not all programs do this!)
process.stdin.close()
print('Waiting for cat to exit')
process.wait()
print('cat finished with return code %d' % process.returncode)
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