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gh-83180: Made launcher treat shebang 'python' tags as low priority so that active virtual environments are preferred (GH-108101)

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Steve Dower 2023-10-02 13:22:55 +01:00 • committed by GitHub
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Doc/using/windows.rst
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@ -867,17 +867,18 @@ For example, if the first line of your script starts with
#! /usr/bin/python
The default Python will be located and used. As many Python scripts written
to work on Unix will already have this line, you should find these scripts can
be used by the launcher without modification. If you are writing a new script
on Windows which you hope will be useful on Unix, you should use one of the
shebang lines starting with ``/usr``.
The default Python or an active virtual environment will be located and used.
As many Python scripts written to work on Unix will already have this line,
you should find these scripts can be used by the launcher without modification.
If you are writing a new script on Windows which you hope will be useful on
Unix, you should use one of the shebang lines starting with ``/usr``.
Any of the above virtual commands can be suffixed with an explicit version
(either just the major version, or the major and minor version).
Furthermore the 32-bit version can be requested by adding "-32" after the
minor version. I.e. ``/usr/bin/python3.7-32`` will request usage of the
32-bit python 3.7.
32-bit Python 3.7. If a virtual environment is active, the version will be
ignored and the environment will be used.
.. versionadded:: 3.7
@ -891,6 +892,13 @@ minor version. I.e. ``/usr/bin/python3.7-32`` will request usage of the
not provably i386/32-bit". To request a specific environment, use the new
:samp:`-V:{TAG}` argument with the complete tag.
.. versionchanged:: 3.13
Virtual commands referencing ``python`` now prefer an active virtual
environment rather than searching :envvar:`PATH`. This handles cases where
the shebang specifies ``/usr/bin/env python3`` but :file:`python3.exe` is
not present in the active environment.
The ``/usr/bin/env`` form of shebang line has one further special property.
Before looking for installed Python interpreters, this form will search the
executable :envvar:`PATH` for a Python executable matching the name provided