Output the per-prefix data in Python form to the given file

def output_prefixdata_code(prefixdata, outfilename, module_prefix, varprefix, per_locale, chunks):
    """Output the per-prefix data in Python form to the given file """
    sorted_keys = sorted(prefixdata.keys())
    total_keys = len(sorted_keys)
    if chunks == -1:
        chunk_size = PREFIXDATA_CHUNK_SIZE
        total_chunks = int(math.ceil(total_keys / float(chunk_size)))
    else:
        chunk_size = int(math.ceil(total_keys / float(chunks)))
        total_chunks = chunks

    outdirname = os.path.dirname(outfilename)
    longest_prefix = 0
    for chunk_num in range(total_chunks):
        chunk_index = chunk_size * chunk_num
        chunk_keys = sorted_keys[chunk_index:chunk_index + chunk_size]
        chunk_data = {}
        for key in chunk_keys:
            chunk_data[key] = prefixdata[key]
        chunk_file = os.path.join(outdirname, 'data%d.py' % chunk_num)
        chunk_longest = output_prefixdata_chunk(
            chunk_data, chunk_file, module_prefix, per_locale)
        if chunk_longest > longest_prefix:
            longest_prefix = chunk_longest

    with open(outfilename, "w") as outfile:
        if per_locale:
            prnt(PREFIXDATA_LOCALE_FILE_PROLOG % {'module': module_prefix}, file=outfile)
        else:
            prnt(PREFIXDATA_FILE_PROLOG % {'module': module_prefix}, file=outfile)
        prnt(COPYRIGHT_NOTICE, file=outfile)
        prnt("%s_DATA = {}" % varprefix, file=outfile)
        for chunk_num in range(total_chunks):
            prnt("from .data%d import data" % chunk_num, file=outfile)
            prnt("%s_DATA.update(data)" % varprefix, file=outfile)
        prnt("del data", file=outfile)
        prnt("%s_LONGEST_PREFIX = %d" % (varprefix, longest_prefix), file=outfile)