  import os
  from io import BytesIO, StringIO, UnsupportedOperation
  
  from django.core.files.utils import FileProxyMixin
  from django.utils import six
  from django.utils.encoding import force_str, force_text
  
  
  class File(FileProxyMixin):
      DEFAULT_CHUNK_SIZE = 64 * 2 ** 10
 
</s> remove from django.utils import six
 </s> add  </s> remove from django.utils import six
 </s> add  </s> remove from django.utils import lru_cache, six
 </s> add from django.utils import lru_cache </s> remove from django.utils import six, timezone
 </s> add from django.utils import timezone </s> remove from django.utils import six
 </s> add 
  import os
  from io import BytesIO, StringIO, UnsupportedOperation
  
  from django.core.files.utils import FileProxyMixin

  from django.utils.encoding import force_str, force_text
  
  
  class File(FileProxyMixin):
      DEFAULT_CHUNK_SIZE = 64 * 2 ** 10
keep keep keep keep replace keep keep keep keep keep
 Refs #23919 -- Removed six.<various>_types usage

Thanks Tim Graham and Simon Charette for the reviews. 
django/core/files/base.py