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Please see ros-infrastructure/rep#149 (draft for REP 151 - Python 3 support) on ros-infrastructure/rep.

Afaik that summarises the current plans for Python 3 support in ROS 1.

the question is are the packages built against Python 2 or 3?

Afaik many packages are already bilingual, but as 'ROS' (which is somewhat ambiguous: which parts?) is large, this cannot be guaranteed for all packages. "core" packages (such as rospkg, rosdistro, catkin_pkg, etc) should all be bilingual already.

The packages produced by the buildfarm however still target Python 2 afaik (but see ros-infrastructure/rep#149 again).