  """
  Classes that represent database functions.
  """
  from django.db.models import IntegerField
  from django.db.models.expressions import Func, Value
  
  
  class Coalesce(Func):
      """
 
</s> remove     Coalesce, Concat, Length, Lower, Substr, Upper,
 </s> add     Coalesce, Concat, Length, Lower, Now, Substr, Upper,
from django.db.models import DateTimeField, IntegerField
  """
  Classes that represent database functions.
  """
from django.db.models import DateTimeField, IntegerField
  from django.db.models.expressions import Func, Value
  
  
  class Coalesce(Func):
      """
keep keep keep replace keep keep keep keep keep
 Fixed #24866 -- Added Now() database function 
django/db/models/functions.py