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Managed and life-cycle nodes are currently not supported in Python, as far as I know. See also #q328772 -- I don't believe the situation has changed.

Managed and life-cycle nodes are currently not supported in Python, as far as I know. See also #q328772 -- I don't believe the situation has changed.

The Features Status page seems to confirm this:

Composition of node components at compile-, link- or dlopen-time: Currently only in C++.

Managed and life-cycle nodes are currently not supported in Python, as far as I know. See also #q328772 -- I don't believe the situation has changed.

The Features Status page seems to confirm this:

Composition of node components at compile-, link- or dlopen-time: Currently only in C++.

It might be possible to load ROS 2 Python nodes at runtime using some Python 'tricks', but it would not seem to be officially supported at this point.