What I do in the command line:
cat file1 file2 file3 > myfile
What I want to do with python:
import subprocess, shlex
my_cmd = 'cat file1 file2 file3 > myfile'
args = shlex.split(my_cmd)
subprocess.call(args) # spits the output in the window i call my python program
In Python 3.5+ to redirect the output, just pass an open file handle for the stdout
argument to subprocess.run
:
# Use a list of args instead of a string
input_files = ['file1', 'file2', 'file3']
my_cmd = ['cat'] + input_files
with open('myfile', "w") as outfile:
subprocess.run(my_cmd, stdout=outfile)
As others have pointed out, the use of an external command like cat
for this purpose is completely extraneous.