detect incorrect format of token

[Mathadon]

When using a wrongly formatted token, e.g.

s.add("123423123123123123 123123", "123423123123123123123123")

(note the space) an error is produced.

requests.exceptions.HTTPError: 400 Client Error: Bad Request for url: https://api.flukso.net/sensor/123423123123123123%20123123/tmpo/sync?rid=0&lvl=0&bid=0

This error persists when fixing the typo since the tokens are apparently cached without checking whether the format is correct. The problem is fixed with s.remove("123423123123123123 123123"). Still, a format check would be useful. E.g.

import re
correctlyFormatted = re.match(r"^[a-z0-9]{32}$", token) is not None

should work.