Redirect bash output to python script

Question

I am using zbarimg to scan bar codes, I want to redirect the output to a python script. How can I redirect the output of the following command:

zbarimg code.png

to a python script, and what should be the script like?

I tried the following script:

#!/usr/local/bin/python
s = raw_input()
print s

I made it an executable by issuing the following:

chmod +x in.py

Than I ran the following :

zbarimg code.png | in.py

I know it's wrong but I can't figure out anything else!

What would an example output of zbarimg code.png look like? — Elmar Peise
– Elmar Peise, Commented Apr 10, 2013 at 15:36

dogbane · Accepted Answer · 2013-04-10 15:34:35Z

4

Use sys.stdin to read from stdin in your python script. For example:

import sys
data = sys.stdin.readlines()

answered Apr 10, 2013 at 15:34

dogbane

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2 Comments

Kartik Anand Over a year ago

Then should I write zbarimg code.png | in.py or should I do zbarimg code.png > in.py ?

dogbane Over a year ago

you need to pipe into the python script: zbarimg code.png | in.py

Leopd · Accepted Answer · 2013-04-10 15:35:43Z

3

Using the pipe operator | from the command is correct, actually. Did it not work?

You might need to explicitly specify the path for the python script as in

zbarimg code.png | ./in.py

and as @dogbane says, reading from stdin like sys.stdin.readlines() is better than using raw_input

answered Apr 10, 2013 at 15:35

Leopd

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Comments

zoza · Accepted Answer · 2015-01-09 22:01:10Z

2

I had to invoke the python program command as somecommand | python mypythonscript.py instead of somecommand | ./mypythonscript.py. This worked for me. The latter produced errors.

My purpose: Sum up the durations of all mp3 files by piping output of soxi -D *mp3 into python: soxi -D *mp3 | python sum_durations.py

Details:

soxi -D *mp3produces:

sum_durations.py script:

import sys
import math
data = sys.stdin.readlines()
#print(data)
sum = 0.0
for line in data:
    #print(line)
    sum += float(line)

mins = math.floor(sum / 60)
secs = math.floor(sum) % 60

print("total duration: " + str(mins) + ":" + str(secs))

answered Jan 9, 2015 at 22:01

zoza

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