If we are replacing "python" for "python3" in bash scripts, and say that python2 is optional, how do we run "make check" in a python2 environment?
Let's distinguish between a python2 environment and a python2-only environment.
With this proposed change, it would no longer be possible to run make check in a *python2-only* environment.
A more complicated solution would be to write python2 and python3 versions of all scripts with shebangs, and do cmake magic to run one, the other, or both. That would require us to maintain two nearly identical versions of each script.
Another way would be to stop relying on the shebangs to execute the scripts, since they are not flexible.
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