def isolate_fields_by_group(field_list, group_name):
    return_value = []
    for field in field_list:
        if field.group == group_name:
            return_value.append(field)

    return return_value


def isolate_fields_by_name(field_list, field_name):
    for field in field_list:
        if field.name == field_name:
            return field

    return None