stdnum.us.rtn

RTN (Routing transport number).

The routing transport number is a nine digit number used in the US banking system for processing deposits between banks.

The last digit is a checksum.

>>> calc_check_digit('11100002')
'5'
>>> validate('111000025')
'111000025'
>>> validate('11100002')  # Not nine digits
Traceback (most recent call last):
    ...
InvalidLength: ..
>>> validate('11100002B')  # Not all numeric
Traceback (most recent call last):
    ...
InvalidFormat: ..
>>> validate('112000025')  # bad checksum
Traceback (most recent call last):
    ...
InvalidChecksum: ..

stdnum.us.rtn.calc_check_digit(number: str) → str

Calculate the check digit. The number passed should not have the check digit included.

stdnum.us.rtn.compact(number: str) → str

Convert the number to the minimal representation. This strips the number of any surrounding whitespace.

stdnum.us.rtn.is_valid(number: str) → bool

Check if the number is a valid RTN.

stdnum.us.rtn.validate(number: str) → str

Check if the number is a valid routing number. This checks the length and check digit.