As of March, [Python devs didn't know](
https://mail.python.org/pipermail/python-dev/2017-March/147660.html) if 2.7 would be part of the main, supported Ubuntu 18.04 distribution. Software in this category is [supported for the life of the distribution](
https://askubuntu.com/a/58365/508752), even if upstream devs stop maintaining it. It looks like [the python2.7 package for bionic](
https://packages.ubuntu.com/bionic/python2.7) is in main, so theoretically Ubuntu is responsible for continued maintenence until 2023.
Ubuntu is being proactive by shipping [only Python 3 by default in 18.04](
https://wiki.ubuntu.com/Python), and I expect this will be the last Ubuntu LTS that officially supports Python 2.7.
I haven't read up on the Debian or Fedora Python situations, but I would be surprised if there weren't at least community-supported packages for those distros for the life of Melodic Morenia.
To maybe better answer your question, the migration wiki mentions that [ROS2 only supports Python 3](
https://github.com/ros2/ros2/wiki/Migration-Guide#pure-python-package).
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