The goal here is to have some data as basis for a decision on these points:
1. How long should we support legacy Python (i.e. version 2.7)?2. Which distribution channels (e.g. pip, conda, Macports, Homebrew, Linux package managers) are actually used? Which should we add support for or support better?
For the questions later concerning installation method and Python version, in case you have multiple Python installations, please respond for the one you are using at the moment or would like to use with Gammapy.