Bash variables to Python while executing bash script

Question

I read the related Questions before asking my question but it's kind of problem specific. I am executing a bash script and the result is stored in a .txt file. Immediately after the file is created, I need to use a number which is contained in the file to do some operations in Python. I take the variable of interest using grep as follows.

MeasureImageSimilarity.sh 3 2 myfile1 myfile2 results.txt
var=$(grep -Ewo "[+-]?[0-9]" result.txt)

My question now is how can i create an array of these "var" variables in Python if i put the above script in a loop. I am asking because i also need the indexes of the hypothetical for-loop that i want to iterate in.

Please add a sample text file which you're working with

ForceBru
– ForceBru

2015-02-27 17:23:52 +00:00
Commented Feb 27, 2015 at 17:23 — ForceBru
– ForceBru, Commented Feb 27, 2015 at 17:23
mywiki.wooledge.org/BashGuide/Arrays ?

Etan Reisner
– Etan Reisner

2015-02-27 17:25:20 +00:00
Commented Feb 27, 2015 at 17:25 — Etan Reisner
– Etan Reisner, Commented Feb 27, 2015 at 17:25
just run the grep using subprocess or use re

Padraic Cunningham
– Padraic Cunningham

2015-02-27 17:33:33 +00:00
Commented Feb 27, 2015 at 17:33 — Padraic Cunningham
– Padraic Cunningham, Commented Feb 27, 2015 at 17:33

azal · Accepted Answer · 2015-02-27 17:48:45Z

1

You could do something like this:

a=subprocess.check_output('(grep -Ewo "[+-]?[0-9]" result.txt)', shell=True)

Since this will return a string you can perform:

a=float(a)

Hope it helps!

answered Feb 27, 2015 at 17:48

azal

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