code: def get_all_access_keys(self, user_name, marker=None, max_items=None):
          
          params = {'UserName' : user_name}
          if marker:
              params['Marker'] = marker
          if max_items:
              params['MaxItems'] = max_items
          return self.get_response('ListAccessKeys', params,
                                   list_marker='AccessKeyMetadata')
docs: Get all access keys associated with an account.
  
          :type user_name: string
          :param user_name: The username of the user
  
          :type marker: string
          :param marker: Use this only when paginating results and only in
                         follow-up request after you've received a response
                         where the results are truncated.  Set this to the
                         value of the Marker element in the response you
                         just received.
  
          :type max_items: int
          :param max_items: Use this only when paginating results to indicate
                            the maximum number of groups you want in the
                            response.