code: def sharepoint(self, *, resource=''):
          
  
          if not isinstance(self.protocol, MSGraphProtocol):
              # TODO: Custom protocol accessing OneDrive/Sharepoint Api fails here
              raise RuntimeError(
                  'Sharepoint api only works on Microsoft Graph API')
  
          return Sharepoint(parent=self, main_resource=resource)
docs: Get an instance to read information from Sharepoint sites for the
          specified account resource
  
          :param str resource: Custom resource to be used in this sharepoint
           object (Defaults to parent main_resource)
          :return: a representation of Sharepoint Sites
          :rtype: Sharepoint
          :raises RuntimeError: if protocol doesn't support the feature