docs: def get_current_membership_for_org(self, account_num, verbose=False):
          """Return a current membership for this org, or, None if
          there is none.
          """
          all_memberships = self.get_memberships_for_org(
              account_num=account_num,
              verbose=verbose)
          # Look for first membership that hasn't expired yet.
          for membership in all_memberships:
              if (membership.expiration_date and
                  membership.expiration_date > datetime.datetime.now()):  # noqa
                  return membership  # noqa
          return None