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Routing Numbers

The pydantic_extra_types.routing_number module provides the ABARoutingNumber data type.

ABARoutingNumber 

ABARoutingNumber(routing_number: str)

Bases: str

The ABARoutingNumber data type is a string of 9 digits representing an ABA routing transit number.

The algorithm used to validate the routing number is described in the ABA routing transit number Wikipedia article.

from pydantic import BaseModel

from pydantic_extra_types.routing_number import ABARoutingNumber

class BankAccount(BaseModel):
    routing_number: ABARoutingNumber

account = BankAccount(routing_number='122105155')
print(account)
#> routing_number='122105155'
Source code in .venv/lib/python3.10/site-packages/pydantic_extra_types/routing_number.py 
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def __init__(self, routing_number: str):
    self._validate_digits(routing_number)
    self._routing_number = self._validate_routing_number(routing_number)