How can I redirect subprocess output to a file in Python?

Redirecting Output in Python with Subprocess

In Python, redirecting output to a file using subprocess can be accomplished through the stdout argument when invoking subprocess.run().

Consider the following command line command:

cat file1 file2 file3 > myfile

This command concatenates the contents of files "file1", "file2", and "file3" and directs the output to the file "myfile".

To perform an analogous operation in Python using subprocess, follow these steps:

1. Create a list of arguments for the subprocess call, including the command (e.g., ['cat']) and the input file names.
2. Open the file to which you want to redirect the output ("myfile" in this case) in write mode.
3. Invoke subprocess.run() with the list of arguments, specifying the open file handle as the stdout parameter.

Example Code (Python 3.5 ):

import subprocess

# Create a list of input file names
input_files = ['file1', 'file2', 'file3']

# Create the command argument list
my_cmd = ['cat'] + input_files

# Open the output file in write mode
with open('myfile', "w") as outfile:
    # Run the subprocess and redirect its output to the file
    subprocess.run(my_cmd, stdout=outfile)

By following this approach, you can effectively redirect the output of a subprocess to a specified file.

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