Edward C. Jones wrote:
I have a program named "octave" (a Matlab clone). It runs in a terminal,
types a prompt and waits for the user to type something. If I try
# Run octave.
oct = subprocess.Popen("octave", stdin=subprocess.PIPE)
# Run an octave called "startup".
oct.communicate("startup")
# Change directory inside octave.
oct.communicate("cd /home/path/to/my/dir")
I get:
ValueError: I/O operation on closed file
As defined in the docs. You can't use communicate()
for what you're trying to do.
How do I set up a subprocess so I can send it a command and get the
answer, then send it another command and get an answer, etc.?
communicate is not the only way of communicating... use
the stdin/stdout handles that are provided. You can
very likely find examples of usage in the list archives.
-Peter
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