code: def send_zip(self, exercise, file, params):
          
  
          resp = self.post(
              exercise.return_url,
              params=params,
              files={
                  "submission[file]": ('submission.zip', file)
              },
              data={
                  "commit": "Submit"
              }
          )
          return self._to_json(resp)
docs: Send zipfile to TMC for given exercise