I&#39;m trying to write a Python script that starts a subprocess, and writes to the subprocess stdin. I&#39;d also like to be able to determine an action to be taken if the subprocess crashes.

The process I&#39;m trying to start is a program called `nuke` which has its own built-in version of Python which I&#39;d like to be able to submit commands to, and then tell it to quit after the commands execute. So far I&#39;ve worked out that if I start Python on the command prompt like and then start `nuke` as a subprocess then I can type in commands to `nuke`, but I&#39;d like to be able to put this all in a script so that the master Python program can start `nuke` and then write to its [standard input][1] (and thus into its built-in version of Python) and tell it to do snazzy things, so I wrote a script that starts `nuke` like this:

    subprocess.call([&quot;C:/Program Files/Nuke6.3v5/Nuke6.3&quot;, &quot;-t&quot;, &quot;E:/NukeTest/test.nk&quot;])

Then nothing happens because `nuke` is waiting for user input. How would I now write to standard input?

I&#39;m doing this because I&#39;m running a plugin with `nuke` that causes it to crash intermittently when rendering multiple frames. So I&#39;d like this script to be able to start `nuke`, tell it to do something and then if it crashes, try again. So if there is a way to catch a crash and still be OK then that&#39;d be great.

  [1]: https://en.wikipedia.org/wiki/Standard_streams#Standard_input_.28stdin.29


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How do I write to a Python subprocess' stdin?