On 2/28/21, Oscar Benjamin <oscar.j.benja...@gmail.com> wrote: > > - It is possible to configure a default version (although I think you > have to do it with an environment variable)
The py launcher in Windows supports a "py.ini" file beside the executable and in %LocalAppData%. The equivalent of the PY_PYTHON, PY_PYTHON2, and PY_PYTHON3 environment variables can be set in the "[defaults]" section as "python", "python2", and "python3" settings. The ini file also supports a "[commands]" section to define additional virtual commands for shebangs. Regular filepaths are also supported in shebangs -- e.g. #!"path\to\any\program.exe". > - I think that the launcher is only installed in an all users install. It defaults to an all-users install, but it can also be installed for just the current user in "%LocalAppData%\Programs\Python\Launcher". In this case, the installation directory always gets added to PATH. > - Listing installations with "py -0p" is somewhat cryptic There's also the long-form options `--list` and `--list-paths`. > - It would be better if you could use the launcher itself to set the > default Python e.g. "py --set-default-python=3.8" It's pretty simply to run `set PY_PYTHON=3.8`, and persist the value in the registry with `setx.exe PY_PYTHON 3.8`. (But don't use setx.exe naively to set PATH.) > On the last point I think that although Anaconda doesn't install the > launcher you can use the launcher to run the python from the Anaconda > installation. I don't use Anaconda, but I don't think that's supposed to be the case according to PEP 514. The launcher only looks for PSF development distributions in the "PythonCore" registry key. _______________________________________________ Python-Dev mailing list -- python-dev@python.org To unsubscribe send an email to python-dev-le...@python.org https://mail.python.org/mailman3/lists/python-dev.python.org/ Message archived at https://mail.python.org/archives/list/python-dev@python.org/message/JPQLBEYVWV2XGXO44JJ4YPN3KFJJYN2Q/ Code of Conduct: http://python.org/psf/codeofconduct/
