how to communicate two separate python processes?

I have two python programs and I want to communicate them.

Both of them are system services and none of them is forked by parent process.

开发者_运维问答

Is there any way to do this without using sockets?

(eg by crating some Queue -> serialize it -> deserialize by other process and perform communication; or write on file process id to which perform communication, and then create magic structure which gets process id and send some messages to this process... )

The solution should work on Linux and Windows.

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Your best bet is ZeroMQ, which is designed for, and extremely fast at IPC (also supports TCP/multicast messaging as well). The Python bindings are really nice, and easy to work with. There is a nice introduction to ZeroMQ with Python here: http://nichol.as/zeromq-an-introduction. If you were planning to expand this across multiple machines, AMQP (which is a message queue protocol) would be a good to look at, there are a lot of great libraries for working with AMQP for python. I really like kombu and celery. You could also think about twisted, which gives you a fairly insane number of options for communication, and a nice event loop to boot.

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On Linux you can use a named pipe. http://en.wikipedia.org/wiki/Named_pipe Just beware, the writing program / thread will block until the reader opens the pipe.

I think windows supports them to some degree.