PEP 739: first round of feedback (#3690)
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Filipe Laíns
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PEP: 739
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Title: Static description file for Python installations
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Title: Static description file for build details of Python installations
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Author: Filipe Laíns <lains@riseup.net>
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PEP-Delegate: Paul Moore <p.f.moore@gmail.com>
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Discussions-To: https://discuss.python.org/t/pep-739-static-description-file-for-build-details-of-python-installations/44572
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Status: Draft
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Type: Standards Track
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Topic: Packaging
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@ -12,16 +13,16 @@ Python-Version: 3.13
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Abstract
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========
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Introduce a standard format for a static description file to describe Python
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installations.
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Introduce a standard format for a static description file with build details
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of Python installations.
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Rationale
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=========
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When introspecting a Python installation, running code is often undesirable or
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impossible. Having a static description file makes various of Python
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installation details available without having to run the interpreter.
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impossible. Having a static description file makes various of Python build
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details available without having to run the interpreter.
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This is helpful for use-cases such as cross-compilation, Python launchers, etc.
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@ -29,52 +30,46 @@ This is helpful for use-cases such as cross-compilation, Python launchers, etc.
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Scope
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=====
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This PEP only defines a standard format for a file describing Python
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installations, distributing such files is out of scope.
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Python implementations may choose to include a self-describing file as part of
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their distribution, but they are not required to, and it is out of scope for
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this PEP to define how that may happen, if they decide to do so.
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This PEP only defines a format. Python implementations may choose to include a
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build details file as part of their distribution, but they are not required to,
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and the specifics of how that file is provided are completely up to them.
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Specification
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=============
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The standard Python installation description format consists of the JSON
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representation of a dictionary with the with the following keys.
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The standard Python build description format consists of the JSON representation
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of a dictionary with the with the following keys.
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schema_version
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--------------
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:Type: ``number``
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:Description: Version of the schema to parse the file contents. It should be
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:Description: Version of the schema to parse the file contents. It SHOULD be
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``1`` for the format described in this document. Future versions
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may add, remove, or change fields.
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MAY add, remove, or change fields. Versions that only add fields
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MAY choose to only increment the schema version by a decimal
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point.
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language
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--------
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Subsection with details related to the language specification.
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Subsection with details related to the Python language specification.
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version
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~~~~~~~
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:Type: ``string``
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:Description: String representation the Python language version. Same as the
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``PY_VERSION`` macro on CPython.
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version_parts
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~~~~~~~~~~~~~
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:Type: ``object``
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:Description: Equivalent to :py:data:`sys.version_info`.
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:Description: String representation the Python language version — a version
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string consisting only of the *major* and *minor* components (Eg.
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``3.13``).
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implementation
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--------------
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Subsection with details related to Python implementation. While only the
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``name`` key is required in this section, this section SHOULD be equivalent to
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:py:data:`sys.implementation` on most implementations.
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Subsection with details related to Python implementation. This section SHOULD be
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equivalent to :py:data:`sys.implementation` on most implementations, but only
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the ``name`` and ``version`` keys are actually required to be present.
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name
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~~~~
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@ -82,6 +77,13 @@ name
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:Type: ``string``
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:Description: Lower-case name of the Python implementation.
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version
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~~~~~~~
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:Type: ``object``
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:Description: Object in the format of :py:data:`sys.version_info`, containing
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the implementation version.
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Implementation-specific keys
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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@ -114,25 +116,42 @@ Example
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{
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"schema_version": 1,
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"language": {
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"version": "3.13.1",
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"version_parts": {
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"version": "3.13"
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},
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"implementation": {
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"name": "cpython",
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"version": {
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"major": 3,
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"minor": 13,
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"micro": 1,
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"releaselevel": "final",
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"serial": 0
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}
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},
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"implementation": {
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"name": "cpython",
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"hexversion": "...",
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"cache_tag": "cpython-313",
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"multiarch": "x86_64-linux-gnu"
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},
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"c_api": {
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},
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"libpython": {
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}
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}
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Rejected Ideas
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==============
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Having a larger scope
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---------------------
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One of the main requests in the discussion of this PEP was the inclusion of
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other kind of information, such as the ``site-packages`` path. It is the opinion
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of the PEP author that information regarding the Python environment should be
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provided by a separate file, creating the a clear separation between the build
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details, which should be immutable accross any interpreter instance, and details
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that can change, such as environment details.
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Copyright
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=========
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