exception_postal_codes.py

class LogisticService:
  def is_serviceable(self, postal_code) -> bool:
    mn, mx = self.get_postal_code_range()
    # use exception list here
    if mn <= postal_code <= mx and postal_code not in self.get_exception_postal_codes():
      return True
    return False
  ...
  def get_exception_postal_codes(self) -> list:
    return []
  ...
  
  
class DoneTodayLogisticService(LogisticService):
  ...
  def get_exception_postal_codes(self) -> list:
    return [690040, 690041]
  ...