code: def _validate_assets(self, assets):
          
          missing_sids = np.setdiff1d(assets, self.sids)
  
          if len(missing_sids):
              raise NoDataForSid(
                  'Assets not contained in daily pricing file: {}'.format(
                      missing_sids
                  )
              )
docs: Validate that asset identifiers are contained in the daily bars.
  
          Parameters
          ----------
          assets : array-like[int]
             The asset identifiers to validate.
  
          Raises
          ------
          NoDataForSid
              If one or more of the provided asset identifiers are not
              contained in the daily bars.