CODEWITHSUNDEEP
pythonsubprocessfilenames
RustyC
RustyC

Reputation: 69

Passing filename to a subprocess from within Python

I'm having problems calling an external command from within a python routine. I've written code before that calls simple commands but this one is a bit trickier and I'm just floundering around and getting nowhere.

The command is one of the GMT (Generic Mapping Tools) commands - "gmtselect" which takes a file of latitude/longitude coordinates and sees which ones are within a polygon defined by a series of lat/long points in a separate file.

If we call these two file "points.txt" and "polygon.txt" then from the command line the call would be:

gmtselect <polygon.txt -Fpolygon.txt

I've tried various ways but cannot see how to do this using subprocess.Popen

Any informed suggestions?

Upvotes: 1

Views: 1157

Answers (1)

askaroni
askaroni

Reputation: 993

import subprocess

with open('filename.txt') as f:
    subprocess.run(['gmtselect', '-Fother.txt'], stdin=f)

Upvotes: 2

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