# Revision history [back]

This seems like a bit of a hack, but I can modify my launch file a little like this:

def generate_launch_description():
node_env = os.environ.copy()
node_env["PYTHONUNBUFFERED"] = "1"

launch_description = LaunchDescription([
Node(package="my_package", node_executable="counter_node", env=node_env),
RegisterEventHandler(
OnProcessIO(on_stdout=lambda info: print(info.text))
)
])


According to this documentation it looks like there's supposed to be a SetEnvironmentVariable launch action, but I don't see it here. Maybe it's not implemented yet.

I'm not sure what issues I'll run into with c++ nodes, but I'll cross that bridge when I come to it

This seems like a bit of a hack, but I can modify my launch file a little like this:

def generate_launch_description():
node_env = os.environ.copy()
node_env["PYTHONUNBUFFERED"] = "1"

launch_description = LaunchDescription([
Node(package="my_package", node_executable="counter_node", env=node_env),
RegisterEventHandler(
OnProcessIO(on_stdout=lambda info: print(info.text))
)
])


According to this documentation it looks like there's supposed to be a SetEnvironmentVariable launch action, but I don't see it here. Maybe it's not implemented yet.

I'm not sure what issues I'll run into with c++ nodes, but I'll cross that bridge when I come to it