code: def new_account(self, label=None):
          
          acc, addr = self._backend.new_account(label=label)
          assert acc.index == len(self.accounts)
          self.accounts.append(acc)
          return acc
docs: Creates new account, appends it to the :class:`Wallet`'s account list and returns it.
  
          :param label: account label as `str`
          :rtype: :class:`Account`