code: def list_checks(self, limit=None, marker=None, return_next=False):
          
          checks = self._check_manager.list(limit=limit, marker=marker,
                  return_next=return_next)
          for check in checks:
              check.set_entity(self)
          return checks
docs: Returns a list of the checks defined for this account. By default the
          number returned is limited to 100; you can define the number to return
          by optionally passing a value for the 'limit' parameter. The value for
          limit must be at least 1, and can be up to 1000.
  
          For pagination, you must also specify the 'marker' parameter. This is
          the ID of the first item to return. To get this, pass True for the
          'return_next' parameter, and the response will be a 2-tuple, with the
          first element being the list of checks, and the second the ID of the
          next item. If there is no next item, the second element will be None.