human
Here's a good function header given the following:
I wrote the below code

    T = current.T
    settings.base.prepopulate += ('ARC', 'ARC/Demo', 'default/users')
    settings.base.system_name = T('Resource    Management    System')
    settings.base.system_name_short = T('ARC    Demo')
    settings.security.policy = 8
    settings.security.map = True
    settings.auth.registration_requires_approval = True
    settings.auth.registration_requires_verification = True
    settings.auth.registration_requests_organisation = True
    settings.auth.registration_organisation_required = True
    settings.auth.registration_requests_site = True
    settings.auth.registration_link_user_to = {'staff': T('Staff'), 'volunteer': T('Volunteer'), 'member': T('Member')}
    settings.auth.record_approval = True
    settings.auth.registration_roles = {'site_id': ['reader']}
    settings.auth.person_realm_human_resource_site_then_org = True
    settings.auth.person_realm_member_org = True
    def ifrc_realm_entity(table, row):
        '\n                                                Assign    a    Realm    Entity    to    records\n                                '
        tablename = table._tablename
        if (tablename in ('hrm_certificate', 'hrm_department', 'hrm_job_title', 'hrm_course', 'hrm_programme', 'member_membership_type', 'vol_award')):
            return None
        db = current.db
        s3db = current.s3db
        EID = 'pe_id'
        SID = 'site_id'
        PID = 'person_id'
        realm_entity_fks = dict(pr_contact=EID, pr_contact_emergency=EID, pr_physical_description=EID, pr_address=EID, pr_image=EID, pr_identity=PID, pr_education=PID, pr_note=PID, hrm_human_resource=SID, inv_recv=SID, inv_send=SID, inv_track_item='track_org_id', inv_adj_item='adj_id', req_req_item='req_id')
        default_fks = ('catalog_id', 'project_id', 'project_location_id')
        realm_entity = 0
        fk = realm_entity_fks.get(tablename, None)
        fks = [fk]
        fks.extend(default_fks)
        for default_fk in fks:
            if (default_fk in table.fields):
                fk = default_fk
...

What's a good function header?
assistant
#Here's a good function header.

def config(settings):