              pass
  
      class RequestsClient(requests.Session):
          def __init__(self, *args, **kwargs):
              super(RequestsClient, self).__init__(*args, **kwargs)
              adapter = DjangoTestAdapter()
              self.mount('http://', adapter)
              self.mount('https://', adapter)
  
          def request(self, method, url, *args, **kwargs):
 
</s> remove             return super(RequestsClient, self).request(method, url, *args, **kwargs)
 </s> add             return super().request(method, url, *args, **kwargs) </s> remove         super(ReturnList, self).__init__(*args, **kwargs)
 </s> add         super().__init__(*args, **kwargs) </s> remove         super(ReturnDict, self).__init__(*args, **kwargs)
 </s> add         super().__init__(*args, **kwargs) </s> remove             return super(CoreAPIClient, self).__init__(*args, **kwargs)
 </s> add             return super().__init__(*args, **kwargs) </s> remove         super(_UnvalidatedField, self).__init__(*args, **kwargs)
 </s> add         super().__init__(*args, **kwargs)
            super().__init__(*args, **kwargs)
              pass
  
      class RequestsClient(requests.Session):
          def __init__(self, *args, **kwargs):
            super().__init__(*args, **kwargs)
              adapter = DjangoTestAdapter()
              self.mount('http://', adapter)
              self.mount('https://', adapter)
  
          def request(self, method, url, *args, **kwargs):
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/test.py