graphene-example.py

import graphene

venues = {
  '0': 'Big Hotel',
  '1': 'Small Hotel',
}

class Venue(graphene.ObjectType):
  address = graphene.String()

class Event(graphene.ObjectType):
  id = graphene.String()
  host = graphene.String()
  venue = graphene.Field(Venue)

  def resolve_venue(self, *a, **k):
    return Venue(address=venues.get(self.venue))

class Query(graphene.ObjectType):
  events = graphene.List(Event)

  def resolve_events(self, info, *args, **kwargs):
    ql_events = []

    for sample in range(10):
      ql_events.append(Event(
        id=str(sample),
        host=str(sample),
        venue=str(sample % 2),
      ))

    return ql_events

schema = graphene.Schema(query=Query)
result = schema.execute('query { events { id, host, venue { address } } }')

print(result.data)