Both work. 1) Your distribution vendor most likely supports both and allows you to install both at the same time. 2) Your company has probably a policy for th

Both work. 1) Your distribution vendor most likely supports both and allows you to install both at the same time. 2) Your company has probably a policy for that. 3) Small Python scripts are trivial to make compatible with both major versions. 4) Python 2 is deprecated but supported. Just write Python 3 for new code.