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I put
#!/usr/bin/env python3.1
as the shebang line of a Python script. What should I change this to so when Python 4.0 is available on a machine, where this script may be run from, it will use python 4.0 instead of any particular older version?
You can’t realistically make the script work with the next major version right now (because it’s likely to break stuff, like 2->3 update did). You can make it use any 3.x version by saying
#!/usr/bin/env python3.