CODEWITHSUNDEEP
pythonsubprocess
Czenek
Czenek

Reputation: 85

Waiting for last line from subprocess

How can I store only the last line returned from a subprocess?

In particular, I call a subprocess from python and it returns a lot of output lines. The subprocess terminates after some unpredictable (and possibly very long) time and I need to process only the last line from STDOUT.

Can I somehow avoid the storing of the whole output and just wait for the last one?

Upvotes: 4

Views: 1758

Answers (1)

glglgl
glglgl

Reputation: 91029

You'll have to process (and discard) every line before reading the last one.

So you could do something like

line = None
for line in proc.stdout:
    pass
# now line is either the last line or None.
if line is not None:
    process(line)

Upvotes: 1

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