client.containers.run(...) gives different output than docker run CLI for local docker images

[nkuehnle]

I'm trying to figure out why my custom image gives different behavior even for a simple echo hello world command, this behavior isn't observed for a base alpine image alone. I'm pretty confused why this would be the case. The python environment this is running from is the same environment/shell that is used to launch the cli commands on the same local system.

client = docker.from_env()
container = client.containers.run(
	image='test_img',
	command="echo hello world",
	remove=True,
	stdout=True,
	stderr=True,
)
container
b'\n'

docker run test_img "echo hello world"
hello world

client = docker.from_env()
container = client.containers.run(
	image='alpine',
	command="echo hello world",
	remove=True,
	stdout=True,
	stderr=True,
)
container
b'hello world\n'

docker run alpine "echo hello world"
hello world