How to redirect output with subprocess in Python?

Question

What I do in the command line:

cat file1 file2 file3 > myfile

What I want to do with python:

import subprocess, shlex
my         


        

Answer 1

One interesting case would be to update a file by appending similar file to it. Then one would not have to create a new file in the process. It is particularly useful in the case where a large file need to be appended. Here is one possibility using teminal command line directly from python.

import subprocess32 as sub

with open("A.csv","a") as f:
    f.flush()
    sub.Popen(["cat","temp.csv"],stdout=f)