[Twisted-Python] [newb] another process question

[Neal Becker]

Using this code:
...
    def processEnded(self, reason):
        print "processEnded, task %s, status %s" % (self.task, 
reason.value.exitCode,)

Here is what I get from a normally terminated process
processEnded, task ['sleep', '4']31662, status 0

But now I kill the subprocess, with SIGTERM, and I get:

processEnded, task ['sleep', '15']31663, status None

This seems to disagree with the twisted process doc.
Instead of an exitCode, I seem to have gotten 'None'

.processEnded(status): This is called when the child process has been 
reaped, and receives information about the process' exit status. The status 
is passed in the form of a Failure instance, created with a .value that 
either holds a ProcessDone object if the process terminated normally (it 
died of natural causes instead of receiving a signal, and if the exit code 
was 0), or a ProcessTerminated object (with an .exitCode attribute) if 
something went wrong. This scheme may seem a bit weird, but I trust that it 
proves useful when dealing with exceptions that occur in asynchronous code.