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Ideally use
python3
if present. If it isn't, usepython2
. If neither are present, print an error explaining the situation.It is an improbable, but permissible, situation for a system to have
python3
but notpython2
. Thepython
alias is currently defined to point topython2
by PEP 394.Downside to this is it gets confusing with virtualenvs. If you run
make
inside a python2 virtualenv, it will attempt to usepython3
from outside the virtualenv in preference to running the venv'spython2
/python