debugging os.spawn*() calls

[Skip Montanaro]

I have an os.spawnv call that's failing:

    pid = os.spawnv(os.P_NOWAIT, "ssh",
                    ["ssh", remote,
                     "PATH=%(path)s nice -20 make -C %(pwd)s" % locals()])

When I wait for it the status returned is 32512, indicating an exit status
of 127.  Unfortunately, I see no way to collect stdout or stderr from the
spawned process, so I can't tell what's going wrong.

The "ssh remotehost PATH=$PATH nice -20 make ..." command works fine from a
similar shell script.

Thx,

Skip