      return None
  
  
  @total_ordering
  @python_2_unicode_compatible
  class Field(RegisterLookupMixin):
      """Base class for all field types"""
  
      # Designates whether empty strings fundamentally are allowed at the
      # database level.
 
</s> remove @python_2_unicode_compatible
 </s> add  </s> remove @python_2_unicode_compatible
 </s> add  </s> remove @python_2_unicode_compatible
 </s> add  </s> remove from django.utils.encoding import python_2_unicode_compatible
 </s> add  </s> remove @python_2_unicode_compatible
 </s> add 
      return None
  
  
  @total_ordering

  class Field(RegisterLookupMixin):
      """Base class for all field types"""
  
      # Designates whether empty strings fundamentally are allowed at the
      # database level.
keep keep keep keep replace keep keep keep keep keep
 Refs #23919 -- Removed python_2_unicode_compatible decorator usage 
django/db/models/fields/__init__.py