How to pipe input to python line by line from linux program?
What you want is popen
, which makes it possible to directly read the output of a command like you would read a file:
import os
with os.popen('ps -ef') as pse:
for line in pse:
print line
# presumably parse line now
Note that, if you want more complex parsing, you'll have to dig into the documentation of subprocess.Popen
.
Instead of using command line arguments I suggest reading from standard input (stdin
). Python has a simple idiom for iterating over lines at stdin
:
import sys
for line in sys.stdin:
sys.stdout.write(line)
My usage example (with above's code saved to iterate-stdin.py
):
$ echo -e "first line\nsecond line" | python iterate-stdin.py
first line
second line
With your example:
$ echo "days go by and still" | python iterate-stdin.py
days go by and still