:::{default-domain} bzl :::

rules_python Changelog

This is a human-friendly changelog in a keepachangelog.com style format. Because this changelog is for end-user consumption of meaningful changes,only a summary of a release's changes is described. This means every commit is not necessarily mentioned, and internal refactors or code cleanups are omitted unless they're particularly notable.

A brief description of the categories of changes:

Changed: Some behavior changed. If the change is expected to break a public API or supported behavior, it will be marked as BREAKING. Note that beta APIs will not have breaking API changes called out.
Fixed: A bug, or otherwise incorrect behavior, was fixed.
Added: A new feature, API, or behavior was added in a backwards compatible manner.
Particular sub-systems are identified using parentheses, e.g. (bzlmod) or (docs).

{#v0-0-0}

Unreleased

{#v0-0-0-changed}

Changed

Breaking:

(toolchains) stop exposing config settings in python toolchain alias repos. Please consider depending on the flags defined in //python/config_setting/... and the @platforms package instead.
(toolchains) consumers who were depending on the MACOS_NAME and the arch attribute in the PLATFORMS list, please update your code to respect the new values. The values now correspond to the values available in the @platforms// package constraint values.
(toolchains) host_platform and interpreter constants are no longer created in the toolchain generated alias .bzl files. If you need to access the host interpreter during the repository_rule evaluation, please use the @python_{version}_host//:python targets created by {bzl:obj}python_register_toolchains and {bzl:obj}python_register_multi_toolchains macros or the {bzl:obj}python bzlmod extension.
(bzlmod) pip.parse.parse_all_requirements_files attribute has been removed. See notes in the previous versions about what to do.
(deps) rules_cc 0.1.0 (workspace) and 0.0.16 (bzlmod).
(deps) protobuf 29.0-rc2 (workspace; bzlmod already specifying that version).

Other changes:

(python_repository) Start honoring the strip_prefix field for zstd archives.
(pypi) {bzl:obj}pip_parse.extra_hub_aliases now works in WORKSPACE files.
(binaries/tests) For {obj}--bootstrap_impl=script, a binary-specific (but otherwise empty) virtual env is used to customize sys.path initialization.
(deps) bazel_skylib 1.7.0 (workspace; bzlmod already specifying that version)
(deps) bazel_features 1.21.0; necessary for compatiblity with Bazel 8 rc3
(deps) stardoc 0.7.2 to support Bazel 8.

{#v0-0-0-fixed}

Fixed

(toolchains) stop depending on uname to get the value of the host platform.
(pypi): Correctly handle multiple versions of the same package in the requirements files which is useful when including different PyTorch builds (e.g. <pytorch+cpu> vs <pytorch+cu118> ) for different target platforms. Fixes (2337).
(uv): Correct the sha256sum for the uv binary for aarch64-apple-darwin. Fixes (2411).
(binaries/tests) ({obj}--bootstrap_impl=scipt) Using sys.executable will use the same sys.path setup as the calling binary. (2169).
(workspace) Corrected protobuf's name to com_google_protobuf, the name is hardcoded in Bazel, WORKSPACE mode.

{#v0-0-0-added}

Added

(gazelle): Parser failures will now be logged to the terminal. Additional details can be logged by setting RULES_PYTHON_GAZELLE_VERBOSE=1.
(toolchains) allow users to select which variant of the support host toolchain they would like to use through RULES_PYTHON_REPO_TOOLCHAIN_{VERSION}_{OS}_{ARCH} env variable setting. For example, this allows one to use freethreaded python interpreter in the repository_rule to build a wheel from sdist.
(toolchain) The python interpreters targeting muslc libc have been added for the latest toolchain versions for each minor Python version. You can control the toolchain selection by using the {bzl:obj}//python/config_settings:py_linux_libc build flag.
(providers) Added {obj}py_runtime_info.site_init_template and {obj}PyRuntimeInfo.site_init_template for specifying the template to use to initialize the interpreter via venv startup hooks.
(runfiles) (Bazel 7.4+) Added support for spaces and newlines in runfiles paths

{#v0-0-0-removed}

Removed

(pypi): Remove pypi_install_dependencies macro that has been included in {bzl:obj}py_repositories for a long time.
(bzlmod): Remove DEFAULT_PYTHON_VERSION from interpreters.bzl file. If you need the version, please use it from the versions.bzl file instead.

{#v0-40-0}

0.40.0 - 2024-11-17

{#v0-40-changed}

Changed

Nothing changed.

{#v0-40-fixed}

Fixed

(rules) Don't drop custom import paths if Bazel-builtin PyInfo is removed. (2414).

{#v0-40-added}

Added

Nothing added.

{#v0-40-removed}

Removed

(publish) Remove deprecated requirements.txt for the twine dependencies. Please use requirements_linux.txt instead.
(python_repository) Use bazel's built in zstd support and remove attributes for customizing the zstd binary to be used for zstd archives in the {bzl:obj}python_repository repository_rule. This affects the {bzl:obj}python_register_toolchains and {bzl:obj}python_register_multi_toolchains callers in the WORKSPACE.

{#v0-39-0}

0.39.0 - 2024-11-13

{#v0-39-0-changed}

Changed

(deps) bazel_skylib 1.6.1 -> 1.7.1
(deps) rules_cc 0.0.9 -> 0.0.14
(deps) protobuf 24.4 -> 29.0-rc2
(deps) rules_proto 6.0.0-rc1 -> 6.0.2
(deps) stardoc 0.6.2 -> 0.7.1
For bzlmod, Bazel 7.4 is now the minimum Bazel version.
(toolchains) Use the latest indygreg toolchain release 20241016 for Python versions:
- 3.9.20
- 3.10.15
- 3.11.10
- 3.12.7
- 3.13.0
(pypi) The naming scheme for the bzlmod spoke repositories have changed as all of the given requirements.txt files are now parsed by default, to temporarily restore the behavior, you can use {bzl:obj}pip.parse.extra_hub_aliases, which will be removed or made noop in the future.

{#v0-39-0-fixed}

Fixed

(precompiling) Skip precompiling (instead of erroring) if the legacy @bazel_tools//tools/python:autodetecting_toolchain is being used (#2364).

{#v0-39-0-added}

Added

Bazel 8 is now supported.
(toolchain) Support for freethreaded Python toolchains is now available. Use the config flag //python/config_settings:py_freethreaded to toggle the selection of the free-threaded toolchains.
(toolchain) {obj}py_runtime.abi_flags attribute and {obj}PyRuntimeInfo.abi_flags field added.

{#v0-39-0-removed}

Removed

Support for Bazel 6 using bzlmod has been dropped.

{#v0-38-0}

0.38.0 - 2024-11-08

{#v0-38-0-changed}

Changed

(deps) (WORKSPACE only) rules_cc 0.0.13 and protobuf 27.0 is now the default version used; this for Bazel 8+ support (previously version was rules_cc 0.0.9 and no protobuf version specified) (2310).
(publish) The dependencies have been updated to the latest available versions for the twine publishing rule.
(whl_library) Remove --no-build-isolation to allow non-hermetic sdist builds by default. Users wishing to keep this argument and to enforce more hermetic builds can do so by passing the argument in pip.parse#extra_pip_args
(pip.parse) {attr}pip.parse.whl_modifications now normalizes the given whl names and now pyyaml and PyYAML will both work.
(bzlmod) pip.parse spoke repository naming will be changed in an upcoming release in places where the users specify different package versions per platform in the same hub repository. The naming of the spoke repos is considered an implementation detail and we advise the users to use the hub repository directly and make use of {bzl:obj}pip.parse.extra_hub_aliases feature added in this release.

{#v0-38-0-fixed}

Fixed

(pypi) (Bazel 7.4+) Allow spaces in filenames included in whl_librarys (617).
(pypi) When {attr}pip.parse.experimental_index_url is set, we need to still pass the extra_pip_args value when building an sdist.
(pypi) The patched wheel filenames from now on are using local version specifiers which fixes usage of the said wheels using standard package managers.
(bzlmod) The extension evaluation has been adjusted to always generate the same lock file irrespective if experimental_index_url is set by any module or not. To opt into this behavior, set pip.parse.parse_all_requirements_files, which will become the default in future releases leading up to 1.0.0. Fixes #2268. A known issue is that it may break bazel query and in these use cases it is advisable to use cquery or switch to download_only = True

{#v0-38-0-added}

Added

(publish) The requirements file for the twine publishing rules have been updated to have a new convention: requirements_darwin.txt, requirements_linux.txt, requirements_windows.txt for each respective OS and one extra file requirements_universal.txt if you prefer a single file. The requirements.txt file may be removed in the future.
The rules_python version is now reported in //python/features.bzl#features.version
(pip.parse) {attr}pip.parse.extra_hub_aliases can now be used to expose extra targets created by annotations in whl repositories. Fixes #2187.
(bzlmod) pip.parse now supports whl-only setup using download_only = True where users can specify multiple requirements files and use the pip backend to do the downloading. This was only available for users setting {bzl:obj}pip.parse.experimental_index_url, but now users have more options whilst we continue to work on stabilizing the experimental feature.

{#v0-37-2}

0.37.2 - 2024-10-27

{#v0-37-2-fixed}

Fixed

(bzlmod) Generate config_setting values for all available toolchains instead of only the registered toolchains, which restores the previous behaviour that bzlmod users would have observed.

{#v0-37-1}

0.37.1 - 2024-10-22

{#v0-37-1-fixed}

Fixed

(rules) Setting --incompatible_python_disallow_native_rules no longer causes rules_python rules to fail (#2326).

{#v0-37-0}

0.37.0 - 2024-10-18

{#v0-37-0-changed}

Changed

BREAKING py_library no longer puts its source files or generated pyc files in runfiles; it's the responsibility of consumers (e.g. binaries) to populate runfiles with the necessary files. Adding source files to runfiles can be temporarily restored by setting {obj}--add_srcs_to_runfiles=enabled, but this flag will be removed in a subsequent releases.
{obj}PyInfo.transitive_sources is now added to runfiles. These files are .py files that are required to be added to runfiles by downstream binaries (or equivalent).
(toolchains) py_runtime.implementation_name now defaults to cpython (previously it defaulted to None).
(toolchains) The exec tools toolchain is enabled by default. It can be disabled by setting {obj}--@rules_python//python/config_settings:exec_tools_toolchain=disabled.
(deps) stardoc 0.6.2 added as dependency.

{#v0-37-0-fixed}

Fixed

(bzlmod) The python.override(minor_mapping) now merges the default and the overridden versions ensuring that the resultant minor_mapping will always have all of the python versions.
(bzlmod) The default value for the {obj}--python_version flag will now be always set to the default python toolchain version value.
(bzlmod) correctly wire the {attr}pip.parse.extra_pip_args all the way to {obj}whl_library. What is more we will pass the extra_pip_args to {obj}whl_library for sdist distributions when using {attr}pip.parse.experimental_index_url. See #2239.
(whl_filegroup): Provide per default also the RECORD file
(py_wheel): RECORD file entry elements are now quoted if necessary when a wheel is created
(whl_library) truncate progress messages from the repo rule to better handle case where a requirement has many --hash=sha256:... flags
(rules) compile_pip_requirements passes env to the X.update target (and not only to the X_test target, a bug introduced in #1067).
(bzlmod) In hybrid bzlmod with WORKSPACE builds, python_register_toolchains(register_toolchains=True) is respected (#1675).
(precompiling) The {obj}pyc_collection attribute now correctly enables (or disables) using pyc files from targets transitively
(pip) Skip patching wheels not matching pip.override's file (#2294).
(chore): Add a rules_shell dev dependency and moved a sh_test target outside of the //:BUILD.bazel file. Fixes #2299.

{#v0-37-0-added}

Added

(py_wheel) Now supports compress = (True|False) to allow disabling compression to speed up development.
(toolchains): A public //python/config_settings:python_version_major_minor has been exposed for users to be able to match on the X.Y version of a Python interpreter.
(api) Added {obj}merge_py_infos() so user rules can merge and propagate PyInfo without losing information.
(toolchains) New Python versions available: 3.13.0 using the 20241008 release.
(toolchains): Bump default toolchain versions to:
- 3.8 -> 3.8.20
- 3.9 -> 3.9.20
- 3.10 -> 3.10.15
- 3.11 -> 3.11.10
- 3.12 -> 3.12.7
(coverage) Add support for python 3.13 and bump coverage.py to 7.6.1.
(bzlmod) Add support for download_only flag to disable usage of sdists when {bzl:attr}pip.parse.experimental_index_url is set.
(api) PyInfo fields: {obj}PyInfo.transitive_implicit_pyc_files, {obj}PyInfo.transitive_implicit_pyc_source_files.

{#v0-37-0-removed}

Removed

(precompiling) {obj}--precompile_add_to_runfiles has been removed.
(precompiling) {obj}--pyc_collection has been removed. The pyc_collection attribute now bases its default on {obj}--precompile.
(precompiling) The {obj}precompile=if_generated_source value has been removed.
(precompiling) The {obj}precompile_source_retention=omit_if_generated_source value has been removed.

{#v0-36-0}

0.36.0 - 2024-09-24

{#v0-36-0-changed}

Changed

(gazelle): Update error messages when unable to resolve a dependency to be more human-friendly.
(flags) The {obj}--python_version flag now also returns {obj}config_common.FeatureFlagInfo.
(toolchain): The toolchain patches now expose the patch_strip attribute that one should use when patching toolchains. Please set it if you are patching python interpreter. In the next release the default will be set to 0 which better reflects the defaults used in public bazel APIs.
(toolchains) When {obj}py_runtime.interpreter_version_info isn't specified, the {obj}--python_version flag will determine the value. This allows specifying the build-time Python version for the {obj}runtime_env_toolchains.
(toolchains) {obj}py_cc_toolchain.libs and {obj}PyCcToolchainInfo.libs is optional. This is to support situations where only the Python headers are available.
(bazel) Minimum bazel 7 version that we test against has been bumped to 7.1.

{#v0-36-0-fixed}

Fixed

(whl_library): Remove --no-index and add --no-build-isolation to the pip install command when installing a wheel from a local file, which happens when experimental_index_url flag is used.
(bzlmod) get the path to the host python interpreter in a way that results in platform non-dependent hashes in the lock file when the requirement markers need to be evaluated.
(bzlmod) correctly watch sources used for evaluating requirement markers for any changes so that the repository rule or module extensions can be re-evaluated when the said files change.
(gazelle): Fix incorrect use of t.Fatal/t.Fatalf in tests.
(toolchain) Omit third-party python packages from coverage reports from stage2 bootstrap template.
(bzlmod) Properly handle relative path URLs in parse_simpleapi_html.bzl
(gazelle) Correctly resolve deps that have top-level module overlap with a gazelle_python.yaml dep module
(rules) Make RUNFILES_MANIFEST_FILE-based invocations work when used with {obj}--bootstrap_impl=script. This fixes invocations using non-sandboxed test execution with --enable_runfiles=false --build_runfile_manifests=true. (#2186).
(py_wheel) Fix incorrectly generated Required-Dist when specifying requirements with markers in extra_requires in py_wheel rule.
(rules) Prevent pytest from trying run the generated stage2 bootstrap .py file when using {obj}--bootstrap_impl=script
(toolchain) The {bzl:obj}gen_python_config_settings has been fixed to include the flag_values from the platform definitions.

{#v0-36-0-added}

Added

(bzlmod): Toolchain overrides can now be done using the new {bzl:obj}python.override, {bzl:obj}python.single_version_override and {bzl:obj}python.single_version_platform_override tag classes. See #2081.
(rules) Executables provide {obj}PyExecutableInfo, which contains executable-specific information useful for packaging an executable or or deriving a new one from the original.
(py_wheel) Removed use of bash to avoid failures on Windows machines which do not have it installed.
(docs) Automatically generated documentation for {bzl:obj}python_register_toolchains and related symbols.
(toolchains) Added {attr}python_repository.patch_strip attribute for allowing values that are other than 1, which has been hard-coded up until now. If you are relying on the undocumented patches support in TOOL_VERSIONS for registering patched toolchains please consider setting the patch_strip explicitly to 1 if you depend on this value - in the future the value may change to default to 0.
(toolchains) Added //python:none, a special target for use with {obj}py_exec_tools_toolchain.exec_interpreter to treat the value as None.

{#v0-36-0-removed}

Removed

(toolchains): Removed accidentally exposed http_archive symbol from python/repositories.bzl.
(toolchains): An internal is_python_config_setting macro has been removed.

{#v0-35-0}

0.35.0 - 2024-08-15

{#v0-35-0-changed}

Changed

(whl_library) A better log message when the wheel is built from an sdist or when the wheel is downloaded using download_only feature to aid debugging.
(gazelle): Simplify and make gazelle_python.yaml have only top level package name. It would work well in cases to reduce merge conflicts.
(toolchains): Change some old toochain versions to use 20240726 release to include dependency updates 3.8.19, 3.9.19, 3.10.14, 3.11.9
(toolchains): Bump default toolchain versions to:
- 3.12 -> 3.12.4
(rules) PYTHONSAFEPATH is inherited from the calling environment to allow disabling it (Requires {obj}--bootstrap_impl=script) (#2060).

{#v0-35-0-fixed}

Fixed

(rules) compile_pip_requirements now sets the USERPROFILE env variable on Windows to work around an issue where setuptools fails to locate the user's home directory.
(rules) correctly handle absolute URLs in parse_simpleapi_html.bzl.
(rules) Fixes build targets linking against @rules_python//python/cc:current_py_cc_libs in host platform builds on macOS, by editing the LC_ID_DYLIB field of the hermetic interpreter's libpython3.x.dylib using install_name_tool, setting it to its absolute path under Bazel's execroot.
(rules) Signals are properly received when using {obj}--bootstrap_impl=script (for non-zip builds). (#2043)
(rules) Fixes Python builds when the --build_python_zip is set to false on Windows. See #1840.
(rules) Fixes Mac + --build_python_zip + {obj}--bootstrap_impl=script (#2030).
(rules) User dependencies come before runtime site-packages when using {obj}--bootstrap_impl=script. (#2064).
(rules) Version-aware rules now return both @_builtins and @rules_python providers instead of only one. (#2114).
(pip) Fixed pypi parse_simpleapi_html function for feeds with package metadata containing ">" sign
(toolchains) Added missing executable permission to //python/runtime_env_toolchains interpreter script so that it is runnable. (#2085).
(pip) Correctly use the sdist downloaded by the bazel downloader when using experimental_index_url feature. Fixes #2091.
(gazelle) Make gazelle_python_manifest.update manual to avoid unnecessary network behavior.
(bzlmod): The conflicting toolchains during python extension will no longer cause warnings by default. In order to see the warnings for diagnostic purposes set the env var RULES_PYTHON_REPO_DEBUG_VERBOSITY to one of INFO, DEBUG or TRACE. Fixes #1818.
(runfiles) Make runfiles lookups work for the situation of Bazel 7, Python 3.9 (or earlier, where safepath isn't present), and the Rlocation call in the same directory as the main file. Fixes #1631.

{#v0-35-0-added}

Added

(rules) compile_pip_requirements supports multiple requirements input files as srcs.
(rules) PYTHONSAFEPATH is inherited from the calling environment to allow disabling it (Requires {obj}--bootstrap_impl=script) (#2060).
(gazelle) Added python_generation_mode_per_package_require_test_entry_point in order to better accommodate users who use a custom macro, pytest-bazel, rules_python_pytest or rules_py py_test_main in order to integrate with pytest. Currently the default flag value is set to true for backwards compatible behaviour, but in the future the flag will be flipped be false by default.
(toolchains) New Python versions available: 3.12.4 using the 20240726 release.
(pypi) Support env markers in requirements files. Note, that this means that if your requirements files contain env markers, the Python interpreter will need to be run during bzlmod phase to evaluate them. This may incur downloading an interpreter (for hermetic-based builds) or cause non-hermetic behavior (if using a system Python).

{#v0-34-0}

0.34.0 - 2024-07-04

{#v0-34-0-changed}

Changed

protobuf/com_google_protobuf dependency bumped to v24.4
(bzlmod): optimize the creation of config settings used in pip to reduce the total number of targets in the hub repo.
(toolchains) The exec tools toolchain now finds its interpreter by reusing the regular interpreter toolchain. This avoids having to duplicate specifying where the runtime for the exec tools toolchain is.
(toolchains) ({obj}//python:autodetecting_toolchain) is deprecated. It is replaced by {obj}//python/runtime_env_toolchains:all. The old target will be removed in a future release.

{#v0-34-0-fixed}

Fixed

(bzlmod): When using experimental_index_url the all_requirements, all_whl_requirements and all_data_requirements will now only include common packages that are available on all target platforms. This is to ensure that packages that are only present for some platforms are pulled only via the deps of the materialized py_library. If you would like to include platform specific packages, using a select statement with references to the specific package will still work (e.g.
```
my_attr = all_requirements + select(
    {
        "@platforms//os:linux": ["@pypi//foo_available_only_on_linux"],
        "//conditions:default": [],
    }
)
```
(bzlmod): Targets in all_requirements now use the same form as targets returned by the requirement macro.
(rules) Auto exec groups are enabled. This allows actions run by the rules, such as precompiling, to pick an execution platform separately from what other toolchains support.
(providers) {obj}PyRuntimeInfo doesn't require passing the interpreter_version_info arg.
(bzlmod) Correctly pass isolated, quiet and timeout values to whl_library and drop the defaults from the lock file.
(whl_library) Correctly handle arch-specific dependencies when we encounter a platform specific wheel and use experimental_target_platforms. Fixes #1996.
(rules) The first element of the default outputs is now the executable again.
(pip) Fixed crash when pypi packages lacked a sha (e.g. yanked packages)

{#v0-34-0-added}

Added

(toolchains) {obj}//python/runtime_env_toolchains:all, which is a drop-in replacement for the "autodetecting" toolchain.
(gazelle) Added new python_label_convention and python_label_normalization directives. These directive allows altering default Gazelle label format to third-party dependencies useful for re-using Gazelle plugin with other rules, including rules_pycross. See #1939.

{#v0-34-0-removed}

Removed

(pip): Removes the entrypoint macro that was replaced by py_console_script_binary in 0.26.0.

{#v0-33-2}

0.33.2 - 2024-06-13

{#v0-33-2-fixed}

Fixed

(toolchains) The {obj}exec_tools_toolchain_type is disabled by default. To enable it, set {obj}--//python/config_settings:exec_tools_toolchain=enabled. This toolchain must be enabled for precompilation to work. This toolchain will be enabled by default in a future release. Fixes #1967.

{#v0-33-1}

0.33.1 - 2024-06-13

{#v0-33-1-fixed}

Fixed

(py_binary) Fix building of zip file when using --build_python_zip argument. Fixes #1954.

{#v0-33-0}

0.33.0 - 2024-06-12

{#v0-33-0-changed}

Changed

(deps) Upgrade the pip_install dependencies to pick up a new version of pip.
(toolchains) Optional toolchain dependency: py_binary, py_test, and py_library now depend on the //python:exec_tools_toolchain_type for build tools.
(deps): Bumped bazel_skylib to 1.6.1.
(bzlmod): The python and internal rules_python extensions have been marked as reproducible and will not include any lock file entries from now on.
(gazelle): Remove gazelle plugin's python deps and make it hermetic. Introduced a new Go-based helper leveraging tree-sitter for syntax analysis. Implemented the use of pypi/stdlib-list for standard library module verification.
(pip.parse): Do not ignore yanked packages when using experimental_index_url. This is to mimic what uv is doing. We will print a warning instead.
(pip.parse): Add references to all supported wheels when using experimental_index_url to allowing to correctly fetch the wheels for the right platform. See the updated docs on how to use the feature. This is work towards addressing #735 and #260. The spoke repository names when using this flag will have a structure of {pip_hub_prefix}_{wheel_name}_{py_tag}_{abi_tag}_{platform_tag}_{sha256}, which is an implementation detail which should not be relied on and is there purely for better debugging experience.
(bzlmod) The pythons_hub//:interpreters.bzl no longer has platform-specific labels which where left there for compatibility reasons. Move to python_{version}_host keys if you would like to have access to a Python interpreter that can be used in a repository rule context.

{#v0-33-0-fixed}

Fixed

(gazelle) Remove visibility from NonEmptyAttr. Now empty(have no deps/main/srcs/imports attr) py_library/test/binary rules will be automatically deleted correctly. For example, if python_generation_mode is set to package, when __init__.py is deleted, the py_library generated for this package before will be deleted automatically.
(whl_library): Use is_python_config_setting to correctly handle multi-python version dependency select statements when the experimental_target_platforms includes the Python ABI. The default python version case within the select is also now handled correctly, stabilizing the implementation.
(gazelle) Fix Gazelle failing on Windows with "panic: runtime error: invalid memory address or nil pointer dereference"
(bzlmod) remove pip.parse(annotations) attribute as it is unused and has been replaced by whl_modifications.
(pip) Correctly select wheels when the python tag includes minor versions. See (#1930)
(pip.parse): The lock file is now reproducible on any host platform if the experimental_index_url is not used by any of the modules in the dependency chain. To make the lock file identical on each os and arch, please use the experimental_index_url feature which will fetch metadata from PyPI or a different private index and write the contents to the lock file. Fixes #1643.
(pip.parse): Install yanked packages and print a warning instead of ignoring them. This better matches the behaviour of uv pip install.
(toolchains): Now matching of the default hermetic toolchain is more robust and explicit and should fix rare edge-cases where the host toolchain autodetection would match a different toolchain than expected. This may yield to toolchain selection failures when the python toolchain is not registered, but is requested via //python/config_settings:python_version flag setting.
(doc) Fix the WORKSPACE requirement vendoring example. Fixes #1918.

{#v0-33-0-added}

Added

(rules) Precompiling Python source at build time is available. but is disabled by default, for now. Set @rules_python//python/config_settings:precompile=enabled to enable it by default. A subsequent release will enable it by default. See the Precompiling docs and API reference docs for more information on precompiling. Note this requires Bazel 7+ and the Pystar rule implementation enabled. (#1761)
(rules) Attributes and flags to control precompile behavior: precompile, precompile_optimize_level, precompile_source_retention, precompile_invalidation_mode, and pyc_collection
(toolchains) The target runtime toolchain (//python:toolchain_type) has two new optional attributes: pyc_tag (tells the pyc filename infix to use) and implementation_name (tells the Python implementation name).
(toolchains) A toolchain type for build tools has been added: //python:exec_tools_toolchain_type.
(providers) PyInfo has two new attributes: direct_pyc_files and transitive_pyc_files, which tell the pyc files a target makes available directly and transitively, respectively.
//python:features.bzl added to allow easy feature-detection in the future.
(pip) Allow specifying the requirements by (os, arch) and add extra validations when parsing the inputs. This is a non-breaking change for most users unless they have been passing multiple requirements_* files together with extra_pip_args = ["--platform=manylinux_2_4_x86_64"], that was an invalid usage previously but we were not failing the build. From now on this is explicitly disallowed.
(toolchains) Added riscv64 platform definition for python toolchains.
(gazelle) The python_visibility directive now supports the $python_root$ placeholder, just like the python_default_visibility directive does.
(rules) A new bootstrap implementation that doesn't require a system Python is available. It can be enabled by setting {obj}--@rules_python//python/config_settings:bootstrap_impl=script. It will become the default in a subsequent release. (#691)
(providers) PyRuntimeInfo has two new attributes: {obj}PyRuntimeInfo.stage2_bootstrap_template and {obj}PyRuntimeInfo.zip_main_template.
(toolchains) A replacement for the Bazel-builtn autodetecting toolchain is available. The //python:autodetecting_toolchain alias now uses it.
(pip): Support fetching and using the wheels for other platforms. This supports customizing whether the linux wheels are pulled for musl or glibc, whether universal2 or arch-specific MacOS wheels are preferred and it also allows to select a particular libc version. All of this is done via the string_flags in @rules_python//python/config_settings. If there are no wheels that are supported for the target platform, rules_python will fallback onto building the sdist from source. This behaviour can be disabled if desired using one of the available string flags as well.
(whl_filegroup) Added a new whl_filegroup rule to extract files from a wheel file. This is useful to extract headers for use in a cc_library.

{#v0-32-2}

0.32.2 - 2024-05-14

{#v0-32-2-fixed}

Fixed

Workaround existence of infinite symlink loops on case insensitive filesystems when targeting linux platforms with recent Python toolchains. Works around an upstream issue. Fixes #1800.

{#v0-32-0}

0.32.0 - 2024-05-12

{#v0-32-0-changed}

Changed

(bzlmod): The MODULE.bazel.lock whl_library rule attributes are now sorted in the attributes section. We are also removing values that are not default in order to reduce the size of the lock file.
(coverage) Bump coverage.py to 7.4.3.
(deps): Bumped bazel_features to 1.9.1 to detect optional support non-blocking downloads.
(deps): Updated pip_tools to >= 7.4.0
(toolchains): Change some old toolchain versions to use 20240224 release to include security fixes 3.8.18, 3.9.18 and 3.10.13
(toolchains): Bump default toolchain versions to:
- 3.8 -> 3.8.19
- 3.9 -> 3.9.19
- 3.10 -> 3.10.14
- 3.11 -> 3.11.9
- 3.12 -> 3.12.3

Fixed

(whl_library): Fix the experimental_target_platforms overriding for platform specific wheels when the wheels are for any python interpreter version. Fixes #1810.
(whl_library): Stop generating duplicate dependencies when encountering duplicates in the METADATA. Fixes #1873.
(gazelle) In project or package generation modes, do not generate py_test rules when there are no test files and do not set main = "__test__.py" when that file doesn't exist.
(whl_library) The group redirection is only added when the package is part of the group potentially fixing aspects that want to traverse a py_library graph. Fixes #1760.
(bzlmod) Setting a particular micro version for the interpreter and the pip.parse extension is now possible, see the examples/pip_parse/MODULE.bazel for how to do it. See #1371.
(refactor) The pre-commit developer workflow should now pass isort and black checks (see #1674).

Added

(toolchains) Added armv7 platform definition for python toolchains.
(toolchains) New Python versions available: 3.11.8, 3.12.2 using the 20240224 release.
(toolchains) New Python versions available: 3.8.19, 3.9.19, 3.10.14, 3.11.9, 3.12.3 using the 20240415 release.
(gazelle) Added a new python_visibility directive to control visibility of generated targets by appending additional visibility labels.
(gazelle) Added a new python_default_visibility directive to control the default visibility of generated targets. See the docs for details.
(gazelle) Added a new python_test_file_pattern directive. This directive tells gazelle which python files should be mapped to the py_test rule. See the original issue and the docs for details.
(wheel) Add support for data_files attributes in py_wheel rule (#1777)
(py_wheel) bzlmod installations now provide a twine setup for the default Python toolchain in rules_python for version 3.11.
(bzlmod) New experimental_index_url, experimental_extra_index_urls and experimental_index_url_overrides to pip.parse for using the bazel downloader. If you see any issues, report in #1357. The URLs for the whl and sdist files will be written to the lock file. Controlling whether the downloading of metadata is done in parallel can be done using parallel_download attribute.
(gazelle) Add a new annotation include_dep. Also add documentation for annotations to gazelle/README.md.
(deps): rules_python depends now on rules_cc 0.0.9
(pip_parse): A new flag use_hub_alias_dependencies has been added that is going to become default in the next release. This makes use of dep_template flag in the whl_library rule. This also affects the experimental_requirement_cycles feature where the dependencies that are in a group would be only accessible via the hub repo aliases. If you still depend on legacy labels instead of the hub repo aliases and you use the experimental_requirement_cycles, now is a good time to migrate.

0.31.0 - 2024-02-12

Changed

For Bazel 7, the core rules and providers are now implemented in rules_python directly and the rules bundled with Bazel are not used. Bazel 6 and earlier continue to use the Bazel builtin symbols. Of particular note, this means, under Bazel 7, the builtin global symbol PyInfo is not the same as what is loaded from rules_python. The same is true of PyRuntimeInfo.

0.30.0 - 2024-02-12

Changed

(toolchains) Windows hosts always ignore pyc files in the downloaded runtimes. This fixes issues due to pyc files being created at runtime and affecting the definition of what files were considered part of the runtime.
(pip_parse) Added the envsubst parameter, which enables environment variable substitutions in the extra_pip_args attribute.
(pip_repository) Added the envsubst parameter, which enables environment variable substitutions in the extra_pip_args attribute.

Fixed

(bzlmod) pip.parse now does not fail with an empty requirements.txt.
(py_wheel) Wheels generated by py_wheel now preserve executable bits when being extracted by installer and/or pip.
(coverage) During the running of lcov, the stdout/stderr was causing test failures. By default, suppress output when generating lcov. This can be overridden by setting 'VERBOSE_COVERAGE'. This change only affect bazel 7.x.x and above.
(toolchain) Changed the host_toolchain to symlink all files to support Windows host environments without symlink support.
(PyRuntimeInfo) Switch back to builtin PyRuntimeInfo for Bazel 6.4 and when pystar is disabled. This fixes an error about target ... does not have ... PyRuntimeInfo. (#1732)

Added

(py_wheel) Added requires_file and extra_requires_files attributes.
(whl_library) experimental_target_platforms now supports specifying the Python version explicitly and the output BUILD.bazel file will be correct irrespective of the python interpreter that is generating the file and extracting the whl distribution. Multiple python target version can be specified and the code generation will generate version specific dependency closures but that is not yet ready to be used and may break the build if the default python version is not selected using common --@rules_python//python/config_settings:python_version=X.Y.Z.
New Python versions available: 3.11.7, 3.12.1 using https://github.com/indygreg/python-build-standalone/releases/tag/20240107.
(toolchain) Allow setting x.y as the python_version parameter in the version-aware py_binary and py_test rules. This allows users to use the same rule import for testing with specific Python versions and rely on toolchain configuration and how the latest version takes precedence if e.g. 3.8 is selected. That also simplifies .bazelrc for any users that set the default python_version string flag in that way.
(toolchain) The runtime's shared libraries (libpython.so et al) can be accessed using @rules_python//python/cc:current_py_cc_libs. This uses toolchain resolution, so the files are from the same runtime used to run a target. If you were previously using e.g. @python_3_11//:libpython, then switch to :current_py_cc_libs for looser coupling to the underlying runtime repo implementation.
(repo rules) The environment variable RULES_PYTHON_REPO_DEBUG=1 can be set to make repository rules log detailed information about what they're up to.
(coverage) Add support for python 3.12 and bump coverage.py to 7.4.1.

0.29.0 - 2024-01-22

Changed

BREAKING The deprecated incompatible_generate_aliases feature flags from pip_parse and gazelle got removed. They had been flipped to True in 0.27.0 release.
BREAKING (wheel) The incompatible_normalize_name and incompatible_normalize_version flags have been removed. They had been flipped to True in 0.27.0 release.
(bzlmod) The pip hub repository now uses the newly introduced config settings using the X.Y python version notation. This improves cross module interoperability and allows to share wheels built by interpreters using different patch versions.

Fixed

(bzlmod pip.parse) Use a platform-independent reference to the interpreter pip uses. This reduces (but doesn't eliminate) the amount of platform-specific content in MODULE.bazel.lock files; Follow #1643 for removing platform-specific content in MODULE.bazel.lock files.
(wheel) The stamp variables inside the distribution name are no longer lower-cased when normalizing under PEP440 conventions.

Added

(toolchains) python_register_toolchains now also generates a repository that is suffixed with _host, that has a single label :python that is a symlink to the python interpreter for the host platform. The intended use is mainly in repository_rule, which are always run using host platform Python. This means that WORKSPACE users can now copy the requirements.bzl file for vendoring as seen in the updated pip_parse_vendored example.
(runfiles) rules_python.python.runfiles.Runfiles now has a static Create method to make imports more ergonomic. Users should only need to import the Runfiles object to locate runfiles.
(toolchains) PyRuntimeInfo now includes a interpreter_version_info field that contains the static version information for the given interpreter. This can be set via py_runtime when registering an interpreter toolchain, and will done automatically for the builtin interpreter versions registered via python_register_toolchains. Note that this only available on the Starlark implementation of the provider.
(config_settings) Added //python/config_settings:is_python_X.Y config settings to match on minor Python version. These settings match any X.Y version instead of just an exact X.Y.Z version.

0.28.0 - 2024-01-07

Changed

BREAKING (pip_install) the deprecated pip_install macro and related items have been removed.
BREAKING Support for Bazel 5 has been officially dropped. This release was only partially tested with Bazel 5 and may or may not work with Bazel 5. Subequent versions will no longer be tested under Bazel 5.
(runfiles) rules_python.python.runfiles now directly implements type hints and drops support for python2 as a result.
(toolchains) py_runtime, py_runtime_pair, and PyRuntimeInfo now use the rules_python Starlark implementation, not the one built into Bazel. NOTE: This only applies to Bazel 6+; Bazel 5 still uses the builtin implementation.
(pip_parse) The parameter experimental_requirement_cycles may be provided a map of names to lists of requirements which form a dependency cycle. pip_parse will break the cycle for you transparently. This behavior is also available under bzlmod as pip.parse(experimental_requirement_cycles={}).
(toolchains) py_runtime can now take an executable target. Note: runfiles from the target are not supported yet. (#1612)
(gazelle) When python_generation_mode is set to file, create one py_binary target for each file with if __name__ == "__main__" instead of just one py_binary for the whole module.
(gazelle) the Gazelle manifest integrity field is now optional. If the requirements argument to gazelle_python_manifest is unset, no integrity field will be generated.

Fixed

(gazelle) The gazelle plugin helper was not working with Python toolchains 3.11 and above due to a bug in the helper components not being on PYTHONPATH.
(pip_parse) The repositories created by whl_library can now parse the whl METADATA and generate dependency closures irrespective of the host platform the generation is executed on. This can be turned on by supplying experimental_target_platforms = ["all"] to the pip_parse or the bzlmod equivalent. This may help in cases where fetching wheels for a different platform using download_only = True feature.
(bzlmod pip.parse) The pip.parse(python_interpreter) arg now works for specifying a local system interpreter.
(bzlmod pip.parse) Requirements files with duplicate entries for the same package (e.g. one for the package, one for an extra) now work.
(bzlmod python.toolchain) Submodules can now (re)register the Python version that rules_python has set as the default. (#1638)
(whl_library) Actually use the provided patches to patch the whl_library. On Windows the patching may result in files with CRLF line endings, as a result the RECORD file consistency requirement is lifted and now a warning is emitted instead with a location to the patch that could be used to silence the warning. Copy the patch to your workspace and add it to the list if patches for the wheel file if you decide to do so.
(coverage): coverage reports are now created when the version-aware rules are used. (#1600)
(toolchains) Workspace builds register the py cc toolchain (bzlmod already was). This makes e.g. //python/cc:current_py_cc_headers Just Work. (#1669)
(bzlmod python.toolchain) The value of ignore_root_user_error is now decided by the root module only. (#1658)

Added

(docs) bzlmod extensions are now documented on rules-python.readthedocs.io
(docs) Support and backwards compatibility policies have been documented. See https://rules-python.readthedocs.io/en/latest/support.html
(gazelle) file generation mode can now also add __init__.py to the srcs attribute for every target in the package. This is enabled through a separate directive python_generation_mode_per_file_include_init.

0.27.0 - 2023-11-16

Changed

Make //python/pip_install:pip_repository_bzl bzl_library target internal as all of the publicly available symbols (etc. package_annotation) are re-exported via //python:pip_bzl bzl_library.
(gazelle) Gazelle Python extension no longer has runtime dependencies. Using GAZELLE_PYTHON_RUNTIME_DEPS from @rules_python_gazelle_plugin//:def.bzl is no longer necessary.
(pip_parse) The installation of pip_parse repository rule toolchain dependencies is now done as part of py_repositories call.
(pip_parse) The generated requirements.bzl file now has an additional symbol all_whl_requirements_by_package which provides a map from the normalized PyPI package name to the target that provides the built wheel file. Use pip_utils.normalize_name function from @rules_python//python:pip.bzl to convert a PyPI package name to a key in the all_whl_requirements_by_package map.
(pip_parse) The flag incompatible_generate_aliases has been flipped to True by default on non-bzlmod setups allowing users to use the same label strings during the transition period. For example, instead of @pypi_foo//:pkg, you can now use @pypi//foo or @pypi//foo:pkg. Other labels that are present in the foo package are dist_info, whl and data. Note, that the @pypi_foo//:pkg labels are still present for backwards compatibility.
(gazelle) The flag use_pip_repository_aliases is now set to True by default, which will cause gazelle to change third-party dependency labels from @pip_foo//:pkg to @pip//foo by default.
The compile_pip_requirements now defaults to pyproject.toml if the src or requirements_in attributes are unspecified, matching the upstream pip-compile behaviour more closely.
(gazelle) Use relative paths if possible for dependencies added through the use of the resolve directive.
(gazelle) When using python_generation_mode file, one py_test target is made per test file even if a target named __test__ or a file named __test__.py exists in the same package. Previously in these cases there would only be one test target made.

Breaking changes:

(pip) pip_install repository rule in this release has been disabled and will fail by default. The API symbol is going to be removed in the next version, please migrate to pip_parse as a replacement. The pip_parse rule no longer supports requirements attribute, please use requirements_lock instead.
(py_wheel) switch incompatible_normalize_name and incompatible_normalize_version to True by default to enforce PEP440 for wheel names built by rules_python.
(tools/wheelmaker.py) drop support for Python 2 as only Python 3 is tested.

Fixed

Skip aliases for unloaded toolchains. Some Python versions that don't have full platform support, and referencing their undefined repositories can break operations like bazel query rdeps(...).
Python code generated from proto_library with strip_import_prefix can be imported now.
(py_wheel) Produce deterministic wheel files and make RECORD file entries follow the order of files written to the .whl archive.
(gazelle) Generate a single py_test target when gazelle:python_generation_mode project is used.
(gazelle) Move waiting for the Python interpreter process to exit to the shutdown hook to make the usage of the exec.Command more idiomatic.
(toolchains) Keep tcl subdirectory in Windows build of hermetic interpreter.
(bzlmod) sub-modules now don't have the //conditions:default clause in the hub repos created by pip.parse. This should fix confusing error messages in case there is a misconfiguration of toolchains or a bug in rules_python.

Added

(bzlmod) Added .whl patching support via patches and patch_strip arguments to the new pip.override tag class.
(pip) Support for using PEP621 compliant pyproject.toml for creating a resolved requirements.txt file.
(utils) Added a pip_utils struct with a normalize_name function to allow users to find out how rules_python would normalize a PyPI distribution name.

0.26.0 - 2023-10-06

Changed

Python version patch level bumps:
- 3.8.15 -> 3.8.18
- 3.9.17 -> 3.9.18
- 3.10.12 -> 3.10.13
- 3.11.4 -> 3.11.6
(deps) Upgrade rules_go 0.39.1 -> 0.41.0; this is so gazelle integration works with upcoming Bazel versions
(multi-version) The distribs attribute is no longer propagated. This attribute has been long deprecated by Bazel and shouldn't be used.
Calling //python:repositories.bzl#py_repositories() is required. It has always been documented as necessary, but it was possible to omit it in certain cases. An error about @rules_python_internal means the py_repositories() call is missing in WORKSPACE.
(bzlmod) The pip.parse extension will generate os/arch specific lock file entries on bazel>=6.4.

Added

(bzlmod, entry_point) Added {obj}py_console_script_binary, which allows adding custom dependencies to a package's entry points and customizing the py_binary rule used to build it.
New Python versions available: 3.8.17, 3.11.5 using https://github.com/indygreg/python-build-standalone/releases/tag/20230826.
(gazelle) New # gazelle:python_generation_mode file directive to support generating one py_library per file.
(python_repository) Support netrc and auth_patterns attributes to enable authentication against private HTTP hosts serving Python toolchain binaries.
//python:packaging_bzl added, a bzl_library for the Starlark files //python:packaging.bzl requires.
(py_wheel) Added the incompatible_normalize_name feature flag to normalize the package distribution name according to latest Python packaging standards. Defaults to False for the time being.
(py_wheel) Added the incompatible_normalize_version feature flag to normalize the package version according to PEP440 standard. This also adds support for local version specifiers (versions with a + in them), in accordance with PEP440. Defaults to False for the time being.
New Python versions available: 3.8.18, 3.9.18, 3.10.13, 3.11.6, 3.12.0 using https://github.com/indygreg/python-build-standalone/releases/tag/20231002. 3.12.0 support is considered beta and may have issues.

Removed

(bzlmod) The entry_point macro is no longer supported and has been removed in favour of the py_console_script_binary macro for bzlmod users.
(bzlmod) The pip.parse no longer generates {hub_name}_{py_version} hub repos as the entry_point macro has been superseded by py_console_script_binary.
(bzlmod) The pip.parse no longer generates {hub_name}_{distribution} hub repos.

Fixed

(whl_library) No longer restarts repository rule when fetching external dependencies improving initial build times involving external dependency fetching.
(gazelle) Improve runfiles lookup hermeticity.

0.25.0 - 2023-08-22

Changed

Python version patch level bumps:
- 3.9.16 -> 3.9.17
- 3.10.9 -> 3.10.12
- 3.11.1 -> 3.11.4
(bzlmod) pip.parse can no longer automatically use the default Python version; this was an unreliable and unsafe behavior. The python_version arg must always be explicitly specified.

Fixed

(docs) Update docs to use correct bzlmod APIs and clarify how and when to use various APIs.
(multi-version) The main arg is now correctly computed and usually optional.
(bzlmod) pip.parse no longer requires a call for whatever the configured default Python version is.

Added

Created a changelog.
(gazelle) Stop generating unnecessary imports.
(toolchains) s390x supported for Python 3.9.17, 3.10.12, and 3.11.4.

0.24.0 - 2023-07-11

Changed

BREAKING (gazelle) Gazelle 0.30.0 or higher is required
(bzlmod) @python_aliases renamed to `@python_versions
(bzlmod) pip.parse arg name renamed to hub_name
(bzlmod) pip.parse arg incompatible_generate_aliases removed and always true.

Fixed

(bzlmod) Fixing Windows Python Interpreter symlink issues
(py_wheel) Allow twine tags and args
(toolchain, bzlmod) Restrict coverage tool visibility under bzlmod
(pip) Ignore temporary pyc.NNN files in wheels
(pip) Add format() calls to glob_exclude templates
plugin_output in py_proto_library rule

Added

Using Gazelle's lifecycle manager to manage external processes
(bzlmod) pip.parse can be called multiple times with different Python versions
(bzlmod) Allow bzlmod pip.parse to reference the default python toolchain and interpreter
(bzlmod) Implementing wheel annotations via whl_mods
(gazelle) support multiple requirements files in manifest generation
(py_wheel) Support for specifying Description-Content-Type and Summary in METADATA
(py_wheel) Support for specifying Project-URL
(compile_pip_requirements) Added generate_hashes arg (default True) to control generating hashes
(pip) Create all_data_requirements alias
Expose Python C headers through the toolchain.

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rules_python Changelog

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0.40.0 - 2024-11-17

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0.39.0 - 2024-11-13

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0.38.0 - 2024-11-08

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0.37.2 - 2024-10-27

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0.37.1 - 2024-10-22

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0.37.0 - 2024-10-18

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0.36.0 - 2024-09-24

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0.35.0 - 2024-08-15

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0.34.0 - 2024-07-04

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0.33.2 - 2024-06-13

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0.33.1 - 2024-06-13

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0.33.0 - 2024-06-12

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0.32.2 - 2024-05-14

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0.32.0 - 2024-05-12

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0.31.0 - 2024-02-12

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0.30.0 - 2024-02-12

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0.29.0 - 2024-01-22

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0.28.0 - 2024-01-07

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0.27.0 - 2023-11-16

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