          if self.binary:
              value = json.dumps(value)
              # On python 2.x the return type for json.dumps() is underspecified.
              # On python 3.x json.dumps() returns unicode strings.
              if isinstance(value, six.text_type):
                  value = bytes(value.encode('utf-8'))
          return value
  
  
  # Miscellaneous field types...
 
</s> remove         if isinstance(ret, six.text_type):
 </s> add         if isinstance(ret, str): </s> remove def unicode_repr(instance):
    # Get the repr of an instance, but ensure it is a unicode string
    # on both python 3 (already the case) and 2 (not the case).
    if six.PY2:
        return repr(instance).decode('utf-8')
    return repr(instance)


def unicode_to_repr(value):
    # Coerce a unicode string to the correct repr return type, depending on
    # the Python version. We wrap all our `__repr__` implementations with
    # this and then use unicode throughout internally.
    if six.PY2:
        return value.encode('utf-8')
    return value


 </s> add  </s> remove     value = unicode_repr(value)
 </s> add     value = repr(value) </s> remove         if output_format is None or isinstance(value, six.string_types):
 </s> add         if output_format is None or isinstance(value, str): </s> remove         if style.get('input_type') == 'datetime-local' and isinstance(field.value, six.text_type):
 </s> add         if style.get('input_type') == 'datetime-local' and isinstance(field.value, str):
            if isinstance(value, str):
          if self.binary:
              value = json.dumps(value)
              # On python 2.x the return type for json.dumps() is underspecified.
              # On python 3.x json.dumps() returns unicode strings.
            if isinstance(value, str):
                  value = bytes(value.encode('utf-8'))
          return value
  
  
  # Miscellaneous field types...
keep keep keep keep replace keep keep keep keep keep
 Dropped Python 2 compatibility. (#6615)

Thanks to Jon Dufresne (@jdufresne) for review.

Co-authored-by: Asif Saif Uddin <auvipy@gmail.com>
Co-authored-by: Rizwan Mansuri <Rizwan@webbyfox.com> 
rest_framework/fields.py