gistfile1.py

files = {
    'train.author.final':'.key_author',
    'train.author.stem.final':'.key_author_stem',
    'train.combined.final':'.key_combined',
    'train.combined.stem.final':'.key_combined_stem',
    'train.reader.final':'.key_reader',
    'train.reader.stem.final':'.key_reader_stem'
    }

for file_name, file_end in files.iteritems():
    all = open('cikkek/plain_text/'+file_name).readlines()
    for line in all:
        out_name,file_content = line.split(' : ')[0],line.split(' : ')[1].split(',')
        out = open(out_name+file_end, 'w')
        for ln in file_content:
            out.write(ln+'\n')
        out.close()