def _copy_files(files, source_dir, dest_dir):
    'Copies a set of files to a given directory.'
    for file in files:
        _copy_file(file, source_dir, dest_dir)
Copies a set of files to a given directory.
def _copy_files(files, source_dir, dest_dir):
    
    for file in files:
        _copy_file(file, source_dir, dest_dir)