code: def _build_credentials(self, nexus_switches):
          
          credentials = {}
          for switch_ip, attrs in nexus_switches.items():
              credentials[switch_ip] = (
                  attrs[const.USERNAME], attrs[const.PASSWORD],
                  attrs[const.HTTPS_VERIFY], attrs[const.HTTPS_CERT],
                  None)
              if not attrs[const.HTTPS_VERIFY]:
                  LOG.warning("HTTPS Certificate verification is "
                              "disabled. Your connection to Nexus "
                              "Switch %(ip)s is insecure.",
                              {'ip': switch_ip})
          return credentials
docs: Build credential table for Rest API Client.
  
          :param nexus_switches: switch config
          :returns credentials: switch credentials list