stringify.py

SOURCE_FILE = "data.txt"
DEST_FILE = "out.txt"

def stringify(s):
    return('\"{}\"'.format(s.strip()))

def stringify_ls(string_ls):
    return ','.join(list(map(stringify, string_ls.split(','))))

def stringify_file(source_file, dest_file): 
    with open(source_file) as sourcefile:
        with open(dest_file, "w") as destfile:
            # skip header line
            header = next(sourcefile)
            destfile.write(header)
            for line in sourcefile:    
                destfile.write(stringify_ls(line))
                destfile.write("\n")