python script to concatenate all the files in the directory into one file

Question

I have written the following script to concatenate all the files in the directory into one single file.

Can this be optimized, in terms of

1. idiomat

Answer 1

No need to use that many variables.

with open(outfilename, 'w') as outfile:
    for fname in filenames:
        with open(fname, 'r') as readfile:
            outfile.write(readfile.read() + "\n\n")