Fix pylint checks
+from datetime import datetime
+
import pytz
import graphene
-from datetime import datetime
-
from graphene_django import DjangoObjectType
from languages.types import LanguageType
from submissions.types import SubmissionTypeType
from schedule.types import ModelScheduleItemType
-from schedule.models import ScheduleItem
-
from .models import Conference, Deadline, AudienceLevel, Topic, Duration, TicketFare
