lenstr

#!/usr/bin/python -tt
# vim: fileencoding=utf8
#{{{ License header: MIT
# Copyright (c) 2016 Till Maas <opensource@till.name>
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import argparse
import sys


if __name__ == "__main__":
    parser = argparse.ArgumentParser(
        "Create a character string that encodes its length")
    parser.add_argument("maxlength", help="Maximum length that is required",
            type=int)
    args = parser.parse_args()

    maxlen = args.maxlength
    output = 0

    padded_length = 5
    length_fmt = "{0:" + str(padded_length) + "}"
    while output < maxlen:
        if len(str(output + padded_length + 5)) >= padded_length:
            padded_length += 5
            length_fmt = "{0:" + str(padded_length) + "}"

        new = length_fmt.format(output + padded_length)
        new = new.replace("  ", "_.").replace(" ", "_")
        sys.stdout.write(new)
        output += len(new)