Docker-py client gives "invalid client port specification"

I am using the docker-py client to create containers on a need basis. So for this, I am using a generator to come up with a port number and trying to use httpd image on a particular port of the host from the generator. But, the client gives out (“invalid port specification: “port number here“”) for any number, for any port number that I am trying to use.

Below is sample code that I am trying:

import docker
client = docker.from_env()
container="httpd", ports={'80/tcp': 43545}, detach=True)

To note: The number 43545 does not have any significance here.

Docker details:

  1. Client – 19.03.6
  2. API Version – 1.40
  3. Engine: 19.03.6


File "/project/api/.venv/lib/python3.7/site-packages/docker/models/", line 803, in run
detach=detach, **kwargs)
File "/project/api/.venv/lib/python3.7/site-packages/docker/models/", line 861, in create
resp = self.client.api.create_container(**create_kwargs)
File "/project/api/.venv/lib/python3.7/site-packages/docker/api/", line 429, in create_container
return self.create_container_from_config(config, name)
File "/projectapi/.venv/lib/python3.7/site-packages/docker/api/", line 440, in create_container_from_config
return self._result(res, True)
File "/projectpi/.venv/lib/python3.7/site-packages/docker/api/", line 267, in _result
File "/projectapi/.venv/lib/python3.7/site-packages/docker/api/", line 263, in _raise_for_status
raise create_api_error_from_http_exception(e)
File "/projectyter/api/.venv/lib/python3.7/site-packages/docker/", line 31, in create_api_error_from_http_exception
raise cls(e, response=response, explanation=explanation)
docker.errors.APIError: 400 Client Error: Bad Request ("invalid port specification: "43545"")

Source: StackOverflow