code: def get_password(self, service, username):
          
          if not self.connected(service):
              # the user pressed "cancel" when prompted to unlock their keyring.
              raise KeyringLocked("Failed to unlock the keyring!")
          if not self.iface.hasEntry(self.handle, service, username, self.appid):
              return None
          password = self.iface.readPassword(
              self.handle, service, username, self.appid)
          return str(password)
docs: Get password of the username for the service