code: def delete_password(self, service, username):
          
          if not self.connected(service):
              # the user pressed "cancel" when prompted to unlock their keyring.
              raise PasswordDeleteError("Cancelled by user")
          if not self.iface.hasEntry(self.handle, service, username, self.appid):
              raise PasswordDeleteError("Password not found")
          self.iface.removeEntry(self.handle, service, username, self.appid)
docs: Delete the password for the username of the service.