On 3/25/20, Steve Barnes <gadgetst...@live.co.uk> wrote: >> Except it's not necessarily what the original post wants. The OP wants the >> shebang "#!/usr/bin/env python3" to "work everywhere by >> default", for which I assume it's implied that it should work consistently >> everywhere. I'd prefer for the launcher's env search to also >> support versioned "pythonX[.Y][-32|-64]" commands such as "python3". > > The windows launcher already does support this with shebangs of: > #!/usr/bin/env python3 # Launch with the latest/preferred version of python3 > #!/usr/bin/env python2 # Launch with the latest/preferred version of python2
That is not consistent with Unix. env is supposed to search PATH for the command. However, the launcher does not search PATH for a versioned command such as "python3". Instead it uses the highest version that's registered for 3.x or 2.x, respectively, or the version set by PY_PYTHON3 or PY_PYTHON2 if defined, respectively. > #!/usr/bin/env python # Launch with the latest/preferred version of python 2 > unless PY_PYTHON=3[.n[-64/32]] is set or py.ini has the same in. In this case "env" first searches PATH before falling back on registered installations and PY_PYTHON, which is correct -- at least for the PATH search. I would prefer that "env" never checks registered installations. For the registry fallback, it should instead check the user and system "App Paths" key, like what ShellExecuteExW does. _______________________________________________ Python-ideas mailing list -- python-ideas@python.org To unsubscribe send an email to python-ideas-le...@python.org https://mail.python.org/mailman3/lists/python-ideas.python.org/ Message archived at https://mail.python.org/archives/list/python-ideas@python.org/message/YX4DOI4MWTB7AVL4QMT5EN4TQBNRSHEZ/ Code of Conduct: http://python.org/psf/codeofconduct/
