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

You can iterate over the lines of a file object directly, without reading the whole thing into memory:

with open(fname, 'r') as readfile:
    for line in readfile:
        outfile.write(line)