code: def get_all_permissionschemes(self, expand=None):
          
          url = 'rest/api/2/permissionscheme'
          params = {}
          if expand:
              params['expand'] = expand
          return (self.get(url, params=params) or {}).get('permissionSchemes')
docs: Returns a list of all permission schemes.
          By default only shortened beans are returned.
          If you want to include permissions of all the schemes,
          then specify the permissions expand parameter.
          Permissions will be included also if you specify any other expand parameter.
          :param expand : permissions,user,group,projectRole,field,all
          :return: