mirrors/cpython
1
0
Fork 0
mirror of https://github.com/python/cpython.git synced 2025-08-04 00:48:58 +00:00
Code Issues Projects Releases Packages Wiki Activity Actions 8

bpo-46566: Add new py.exe launcher implementation (GH-32062)

Browse source
This commit is contained in:
Steve Dower 2022-03-29 00:21:08 +01:00 • committed by GitHub
parent 5c30388f3c
commit bad86a621a
No known key found for this signature in database
GPG key ID: 4AEE18F83AFDEB23
10 changed files with 2821 additions and 16 deletions
Download patch file Download diff file Expand all files Collapse all files

63
Doc/using/windows.rst
View file

@ -817,6 +817,13 @@ minor version. I.e. ``/usr/bin/python2.7-32`` will request usage of the
by the "-64" suffix. Furthermore it is possible to specify a major and
architecture without minor (i.e. ``/usr/bin/python3-64``).
.. versionchanged:: 3.11
The "-64" suffix is deprecated, and now implies "any architecture that is
not provably i386/32-bit". To request a specific environment, use the new
``-V:<TAG>`` argument with the complete tag.
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. This corresponds to the
@ -937,13 +944,65 @@ For example:
Diagnostics
-----------
If an environment variable ``PYLAUNCH_DEBUG`` is set (to any value), the
If an environment variable :envvar:`PYLAUNCHER_DEBUG` is set (to any value), the
launcher will print diagnostic information to stderr (i.e. to the console).
While this information manages to be simultaneously verbose *and* terse, it
should allow you to see what versions of Python were located, why a
particular version was chosen and the exact command-line used to execute the
target Python.
target Python. It is primarily intended for testing and debugging.
Dry Run
-------
If an environment variable :envvar:`PYLAUNCHER_DRYRUN` is set (to any value),
the launcher will output the command it would have run, but will not actually
launch Python. This may be useful for tools that want to use the launcher to
detect and then launch Python directly. Note that the command written to
standard output is always encoded using UTF-8, and may not render correctly in
the console.
Install on demand
-----------------
If an environment variable :envvar:`PYLAUNCHER_ALLOW_INSTALL` is set (to any
value), and the requested Python version is not installed but is available on
the Microsoft Store, the launcher will attempt to install it. This may require
user interaction to complete, and you may need to run the command again.
An additional :envvar:`PYLAUNCHER_ALWAYS_INSTALL` variable causes the launcher
to always try to install Python, even if it is detected. This is mainly intended
for testing (and should be used with :envvar:`PYLAUNCHER_DRYRUN`).
Return codes
------------
The following exit codes may be returned by the Python launcher. Unfortunately,
there is no way to distinguish these from the exit code of Python itself.
The names of codes are as used in the sources, and are only for reference. There
is no way to access or resolve them apart from reading this page. Entries are
listed in alphabetical order of names.
+-------------------+-------+-----------------------------------------------+
| Name | Value | Description |
+===================+=======+===============================================+
| RC_BAD_VENV_CFG | 107 | A :file:`pyvenv.cfg` was found but is corrupt.|
+-------------------+-------+-----------------------------------------------+
| RC_CREATE_PROCESS | 101 | Failed to launch Python. |
+-------------------+-------+-----------------------------------------------+
| RC_INSTALLING | 111 | An install was started, but the command will |
| | | need to be re-run after it completes. |
+-------------------+-------+-----------------------------------------------+
| RC_INTERNAL_ERROR | 109 | Unexpected error. Please report a bug. |
+-------------------+-------+-----------------------------------------------+
| RC_NO_COMMANDLINE | 108 | Unable to obtain command line from the |
| | | operating system. |
+-------------------+-------+-----------------------------------------------+
| RC_NO_PYTHON | 103 | Unable to locate the requested version. |
+-------------------+-------+-----------------------------------------------+
| RC_NO_VENV_CFG | 106 | A :file:`pyvenv.cfg` was required but not |
| | | found. |
+-------------------+-------+-----------------------------------------------+
.. _windows_finding_modules: