network.containers raises docker.errors.NotFound

Details

Python Version: 3.8.5
docker-py Version: 4.4.0
Docker Version: 20.10.6, build 370c289
Using Docker Desktop with WSL Backend and Windows 10 Version 20H2 (Build 19042.1348)

The Problem

For some reason network.containers raises an docker.errors.NotFound when executed:

This is the code:

print(self.docker_network)
print(self.docker_network.attrs)
print(self.docker_network.containers)  # <- here it crashes.

Output:

<Network: 8ed90c045f>
{'Name': 'my-network', 'Id': '8ed90c045fb21381f193d2772030e21e02ed3bf7c368f40e0b60e92d8d8ef385', 'Created': '2022-01-28T09:19:54.2036542Z', 'Scope': 'local', 'Driver': 'bridge', 'EnableIPv6': False, 'IPAM': {'Driver': 'default', 'Options': None, 'Config': [{'Subnet': '172.19.0.0/16', 'Gateway': '172.19.0.1'}]}, 'Internal': False, 'Attachable': False, 'Ingress': False, 'ConfigFrom': {'Network': ''}, 'ConfigOnly': False, 'Containers': {'60eb864274beceb8649df2e507a7dad6c6139953f5f5ef8b612249ddf23eb084': {'Name': 'my-container', 'EndpointID': '8b902c88ee667a2bc1177a947a79a63dda98094e1db5a115ac0eab445140d063', 'MacAddress': '02:42:ac:13:00:02', 'IPv4Address': '172.19.0.2/16', 'IPv6Address': ''}}, 'Options': {}, 'Labels': {}}

docker.errors.NotFound: 404 Client Error for http+docker://localnpipe/v1.41/containers/c2ee758d369714df097e5394d33a41e73be9765845cf8a5deec0cd3147dd2d83/json: Not Found ("No such container: c2ee758d369714df097e5394d33a41e73be9765845cf8a5deec0cd3147dd2d83")

As it seems it searches for a container that does not exist. But there is something odd: The ID is always changing when I re-execute the code. But there is only 1 Container in that network. I really don't know where it is taking that ID from.

Start by reproducing the reported access to network.containers with the Docker and docker-py versions shown, then trace how that property resolves the container IDs returned in the network attributes. Done means network.containers no longer raises NotFound for the reported network and correctly handles the attached container.