  import sys
  
  from django.conf import settings
  from django.core import exceptions
  from django.db import connections, router, transaction, DatabaseError
  from django.db.models.constants import LOOKUP_SEP
  from django.db.models.fields import AutoField
  from django.db.models.query_utils import (Q, select_related_descend,
      deferred_class_factory, InvalidQuery)
  from django.db.models.deletion import Collector
 
</s> remove             exc_info = sys.exc_info()
            try:
                return self.get(**lookup), False
            except self.model.DoesNotExist:
                # Re-raise the DatabaseError with its original traceback.
                six.reraise(*exc_info)
 </s> add             if isinstance(e, IntegrityError):
                try:
                    return self.get(**lookup), False
                except self.model.DoesNotExist:
                    pass
            six.reraise(*sys.exc_info()) </s> remove         except DatabaseError:
 </s> add         except DatabaseError as e: </s> remove             obj = self.model(**params)
            sid = transaction.savepoint(using=self.db)
 </s> add  </s> remove             six.reraise(sys.exc_info())
 </s> add             six.reraise(*sys.exc_info())
from django.db import connections, router, transaction, DatabaseError, IntegrityError
  import sys
  
  from django.conf import settings
  from django.core import exceptions
from django.db import connections, router, transaction, DatabaseError, IntegrityError
  from django.db.models.constants import LOOKUP_SEP
  from django.db.models.fields import AutoField
  from django.db.models.query_utils import (Q, select_related_descend,
      deferred_class_factory, InvalidQuery)
  from django.db.models.deletion import Collector
keep keep keep keep replace keep keep keep keep keep
 Fixed #20761 -- Fixed DatabaseError handling in get_or_create and update_or_create. 
django/db/models/query.py