Its good that ROS2 has stardardized on python3.
As for ROS[1], support for pyrhon2.7 vs python3 comes down to the package author/owner.
Some package support python3 while sone doesnt. Its completely possible to use ROS with python3.
I dont know if a guaranteed way to correctly notify users if their collection of code does/doesnt work with a specific version of python.
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