human
I wrote the below code

    db = current.db
    s3db = current.s3db
    s3 = current.response.s3
    def prep(r):
        s3db.gis_location_filter(r)
        if r.interactive:
            if (not r.component):
                method = r.method
                get_vars = r.get_vars
                type_filter = get_vars.get('facility_type.name', None)
                if type_filter:
                    type_names = [s3_unicode(name).lower().strip() for name in type_filter.split(',')]
                    field = s3db.org_site_facility_type.facility_type_id
                    field.comment = None
                    if (len(type_names) == 1):
                        list_fields = s3db.get_config('org_facility', 'list_fields')
                        try:
                            list_fields.remove('site_facility_type.facility_type_id')
                        except ValueError:
                            pass
                        if ((not method) or (method == 'create')):
                            type_table = s3db.org_facility_type
                            query = (type_table.name == type_filter)
                            row = db(query).select(type_table.id, limitby=(0, 1)).first()
                            type_id = (row and row.id)
                            if type_id:
                                field.default = type_id
                                field.writable = False
                                crud_form = s3db.get_config('org_facility', 'crud_form')
                                for e in crud_form.elements:
                                    if (e.selector == 'facility_type'):
                                        e.options.label = ''
                if r.id:
                    table = r.table
                    field = table.obsolete
                    field.readable = field.writable = True
                    if ((method == 'update') and (r.representation == 'popup') and (get_vars.get('profile') == 'org_organisation')):
                        field = table.organisation_id
              ...

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

def org_facility_controller():