class MissingType: def __init__(self, *args, **kwargs): pass try: # Postgres fields are only available in Django with psycopg2 installed # and we cannot have psycopg2 on PyPy from django.contrib.postgres.fields import ( IntegerRangeField, ArrayField, HStoreField, RangeField, ) except ImportError: IntegerRangeField, ArrayField, HStoreField, RangeField = (MissingType,) * 4