text: #!/usr/bin/env python3
  #
  # Copyright Soramitsu Co., Ltd. All Rights Reserved.
  # SPDX-License-Identifier: Apache-2.0
  #
  
  from iroha import Iroha, IrohaGrpc
  from iroha import IrohaCrypto
  import os
  import sys
  import time
  import uuid
  
  if sys.version_info[0] < 3:
      raise Exception('Python 3 or a more recent version is required.')
  
  IROHA_HOST_ADDR = os.getenv('IROHA_HOST_ADDR', '127.0.0.1')
  IROHA_PORT = os.getenv('IROHA_PORT', '50051')
  ADMIN_ACCOUNT_ID = os.getenv('ADMIN_ACCOUNT_ID', 'admin@test')
  ADMIN_PRIVATE_KEY = os.getenv(
      'ADMIN_PRIVATE_KEY', 'f101537e319568c765b2cc89698325604991dca57b9716b58016b253506cab70')
  
  iroha = Iroha(ADMIN_ACCOUNT_ID)
  net = IrohaGrpc('{}:{}'.format(IROHA_HOST_ADDR, IROHA_PORT))
  
  
  def send_tx():
      rand_name = uuid.uuid4().hex
      rand_key = IrohaCrypto.private_key()
      domain = ADMIN_ACCOUNT_ID.split('@')[1]
      tx = iroha.transaction([
          iroha.command('CreateAccount',
                        account_name=rand_name,
                        domain_id=domain,
                        public_key=rand_key)
      ])
      IrohaCrypto.sign_transaction(tx, ADMIN_PRIVATE_KEY)
      net.send_tx(tx)
      print('tx is sent')
  
  
  if __name__ == '__main__':
      query = iroha.blocks_query()
      IrohaCrypto.sign_query(query, ADMIN_PRIVATE_KEY)
      blocks = net.send_blocks_stream_query(
          query, timeout=120)  # timeout in seconds
      send_tx()
      print(next(blocks))
  