docs: def get_access_flags_string(self):
          """
              Return the access flags string of the field
  
              :rtype: string
          """
          if self.access_flags_string == None:
              self.access_flags_string = get_access_flags_string(
                  self.get_access_flags())
  
              if self.access_flags_string == "":
                  self.access_flags_string = "0x%x" % self.get_access_flags()
          return self.access_flags_string