old_contents: #!/usr/bin/env python3
  
  import asyncio
  from aiodocker.docker import Docker
  from aiodocker.exceptions import DockerError
  
  
  async def demo(docker):
      print('--------------------------------')
      print('- Check Docker Version Information')
      data_version = await docker.version()
      for key, value in data_version.items():
          print(key, ':', value)
  
      print('--------------------------------')
      print('- Check Docker Image List')
      images = await docker.images.list()
      for image in images:
          for key, value in image.items():
              if key == 'RepoTags':
                  print(key, ':', value)
  
      print('--------------------------------')
      print('- Check Docker Container List')
      containers = await docker.containers.list()
      for container in containers:
          container_show = await container.show()
          for key, value in container_show.items():
              if key == 'Id':
                  print('Id', ':', value[:12])
      print('--------------------------------')
  
  
  if __name__ == '__main__':
      loop = asyncio.get_event_loop()
      docker = Docker()
      try:
          loop.run_until_complete(demo(docker))
      finally:
          loop.run_until_complete(docker.close())
          loop.close()
  
new_contents: #!/usr/bin/env python3
  
  import asyncio
  from aiodocker.docker import Docker
  
  
  async def demo(docker):
      print('--------------------------------')
      print('- Check Docker Version Information')
      data_version = await docker.version()
      for key, value in data_version.items():
          print(key, ':', value)
  
      print('--------------------------------')
      print('- Check Docker Image List')
      images = await docker.images.list()
      for image in images:
          for key, value in image.items():
              if key == 'RepoTags':
                  print(key, ':', value)
  
      print('--------------------------------')
      print('- Check Docker Container List')
      containers = await docker.containers.list()
      for container in containers:
          container_show = await container.show()
          for key, value in container_show.items():
              if key == 'Id':
                  print('Id', ':', value[:12])
      print('--------------------------------')
  
  
  if __name__ == '__main__':
      loop = asyncio.get_event_loop()
      docker = Docker()
      try:
          loop.run_until_complete(demo(docker))
      finally:
          loop.run_until_complete(docker.close())
          loop.close()
  
subject: remove unnecessary import (#111)