stdnum.fi.alv

ALV nro (Arvonlisäveronumero, Finnish VAT number).

The number is an 8-digit code with a weighted checksum.

>>> validate('FI 20774740')
'20774740'
>>> validate('FI 20774741')  # invalid check digit
Traceback (most recent call last):
    ...
InvalidChecksum: ...

stdnum.fi.alv.checksum(number: str) → int

Calculate the checksum.

stdnum.fi.alv.compact(number: str) → str

Convert the number to the minimal representation. This strips the number of any valid separators and removes surrounding whitespace.

stdnum.fi.alv.is_valid(number: str) → bool

Check if the number is a valid VAT number.

stdnum.fi.alv.validate(number: str) → str

Check if the number is a valid VAT number. This checks the length, formatting and check digit.