Fix `PYTHONHOME` inheritance when spawning different Python versions by mmangkad · Pull Request #17821 · astral-sh/uv

mmangkad · 2026-02-02T20:57:48Z

Summary

When a Python version installed by uv spawns another Python version via subprocess (e.g., Python 3.12 spawning Python 3.13), the child process would inherit the parent's PYTHONHOME environment variable. This caused the child Python to load the wrong stdlib, resulting in errors like AssertionError: SRE module mismatch.

The fix removes the check that prevented overwriting an inherited PYTHONHOME value. Now the Windows trampoline always sets PYTHONHOME to the correct directory for non-virtualenv Python installations, ensuring each Python version uses its own stdlib.

Test Plan

Tested manually using the reproduction script from the issue:

uv python install 3.12
uv python install 3.13

echo "from os import environ;print(environ['PYTHONHOME']);import re" > test.py
python3.12.exe -c "import subprocess; subprocess.run(['python3.13.exe', 'test.py'])"

Before: AssertionError: SRE module mismatch
After: Runs successfully with correct PYTHONHOME pointing to 3.13's installation.

EliteTK · 2026-02-03T11:49:35Z

The concern here is that now you cannot legitimately override PYTHONHOME before running python.

It's not an easy problem to solve.

Some options I can think of:

We set some marker variable alongside PYTHONHOME and then in this logic, if PYTHONHOME is set, we only override it if matches the marker variable.
We check that the set PYTHONHOME makes sense (not necessarily trivial).

mmangkad · 2026-02-03T14:06:43Z

The concern here is that now you cannot legitimately override PYTHONHOME before running python.

It's not an easy problem to solve.

Some options I can think of:

We set some marker variable alongside PYTHONHOME and then in this logic, if PYTHONHOME is set, we only override it if matches the marker variable.

We check that the set PYTHONHOME makes sense (not necessarily trivial).

Yeah I noticed that issue too. I think option 1 with the marker variable makes sense, set something like UV_INTERNAL__PYTHONHOME alongside it, then only override if the marker matches. That way user-set values are preserved but inherited ones from parent Python processes get corrected. Should I go ahead with that approach?

EliteTK · 2026-02-03T14:17:41Z

It's probably fair to wait for @zanieb to chip in on this. They may have thought about this more than I have.

I should clarify though, there are still issues even with option 1.

We can't know that the user hasn't tampered with it or unset it. This is probably a non-issue though. We can document something about this variable so users know what they could break if they change it and act accordingly.
If the user wants to set PYTHONPATH to the same value as it is currently set to, and they intend that change to persist, they can't do that without e.g. un-setting our tracker variable. So this might still break some weird workflow (although I admit it seems like a slim chance).

zanieb · 2026-02-03T15:57:16Z

Yeah I think doing something like UV_INTERNAL__PYTHONHOME sounds reasonable to me

mmangkad · 2026-02-03T16:26:48Z

PTAL @zanieb, thanks!

…17821) Fixes #17814. When a Python version installed by uv spawns another Python version via subprocess (e.g., Python 3.12 spawning Python 3.13), the child process would inherit the parent's `PYTHONHOME` environment variable. This caused the child Python to load the wrong stdlib, resulting in errors like `AssertionError: SRE module mismatch`. The fix removes the check that prevented overwriting an inherited `PYTHONHOME` value. Now the Windows trampoline always sets `PYTHONHOME` to the correct directory for non-virtualenv Python installations, ensuring each Python version uses its own stdlib. Tested manually using the reproduction script from the issue: ``` uv python install 3.12 uv python install 3.13 echo "from os import environ;print(environ['PYTHONHOME']);import re" > test.py python3.12.exe -c "import subprocess; subprocess.run(['python3.13.exe', 'test.py'])" ``` Before: `AssertionError: SRE module mismatch` After: Runs successfully with correct `PYTHONHOME` pointing to 3.13's installation. --------- Co-authored-by: Zanie Blue <[email protected]>

This MR contains the following updates: | Package | Update | Change | |---|---|---| | [astral-sh/uv](https://github.com/astral-sh/uv) | minor | `0.9.28` → `0.10.0` | MR created with the help of [el-capitano/tools/renovate-bot](https://gitlab.com/el-capitano/tools/renovate-bot). **Proposed changes to behavior should be submitted there as MRs.** --- ### Release Notes <details> <summary>astral-sh/uv (astral-sh/uv)</summary> ### [`v0.10.0`](https://github.com/astral-sh/uv/blob/HEAD/CHANGELOG.md#0100) [Compare Source](astral-sh/uv@0.9.30...0.10.0) Since we released uv [0.9.0](https://github.com/astral-sh/uv/releases/tag/0.9.0) in October of 2025, we've accumulated various changes that improve correctness and user experience, but could break some workflows. This release contains those changes; many have been marked as breaking out of an abundance of caution. We expect most users to be able to upgrade without making changes. This release also includes the stabilization of preview features. Python upgrades are now stable, including the `uv python upgrade` command, `uv python install --upgrade`, and automatically upgrading Python patch versions in virtual environments when a new version is installed. The `add-bounds` and `extra-build-dependencies` settings are now stable. Finally, the `uv workspace dir` and `uv workspace list` utilities for writing scripts against workspace members are now stable. ##### Breaking changes - **Require `--clear` to remove existing virtual environments in `uv venv`** ([#17757](astral-sh/uv#17757)) Previously, `uv venv` would prompt for confirmation before removing an existing virtual environment in interactive contexts, and remove it without confirmation in non-interactive contexts. Now, `uv venv` requires the `--clear` flag to remove an existing virtual environment. A warning for this change was added in [uv 0.8](https://github.com/astral-sh/uv/blob/main/changelogs/0.8.x.md#breaking-changes). You can opt out of this behavior by passing the `--clear` flag or setting `UV_VENV_CLEAR=1`. - **Error if multiple indexes include `default = true`** ([#17011](astral-sh/uv#17011)) Previously, uv would silently accept multiple indexes with `default = true` and use the first one. Now, uv will error if multiple indexes are marked as the default. You cannot opt out of this behavior. Remove `default = true` from all but one index. - **Error when an `explicit` index is unnamed** ([#17777](astral-sh/uv#17777)) Explicit indexes can only be used via the `[tool.uv.sources]` table, which requires referencing the index by name. Previously, uv would silently accept unnamed explicit indexes, which could never be referenced. Now, uv will error if an explicit index does not have a name. You cannot opt out of this behavior. Add a `name` to the explicit index or remove the entry. - **Install alternative Python executables using their implementation name** ([#17756](astral-sh/uv#17756), [#17760](astral-sh/uv#17760)) Previously, `uv python install` would install PyPy, GraalPy, and Pyodide executables with names like `python3.10` into the bin directory. Now, these executables will be named using their implementation name, e.g., `pypy3.10`, `graalpy3.10`, and `pyodide3.12`, to avoid conflicting with CPython installations. You cannot opt out of this behavior. - **Respect global Python version pins in `uv tool run` and `uv tool install`** ([#14112](astral-sh/uv#14112)) Previously, `uv tool run` and `uv tool install` did not respect the global Python version pin (set via `uv python pin --global`). Now, these commands will use the global Python version when no explicit version is requested. For `uv tool install`, if the tool is already installed, the Python version will not change unless `--reinstall` or `--python` is provided. If the tool was previously installed with an explicit `--python` flag, the global pin will not override it. You can opt out of this behavior by providing an explicit `--python` flag. - **Remove Debian Bookworm, Alpine 3.21, and Python 3.8 Docker images** ([#17755](astral-sh/uv#17755)) The Debian Bookworm and Alpine 3.21 images were replaced by Debian Trixie and Alpine 3.22 as defaults in [uv 0.9](astral-sh/uv#15352). These older images are now removed. Python 3.8 images are also removed, as Python 3.8 is no longer supported in the Trixie or Alpine base images. The following image tags are no longer published: - `uv:bookworm`, `uv:bookworm-slim` - `uv:alpine3.21` - `uv:python3.8-*` Use `uv:debian` or `uv:trixie` instead of `uv:bookworm`, `uv:alpine` or `uv:alpine3.22` instead of `uv:alpine3.21`, and a newer Python version instead of `uv:python3.8-*`. - **Drop PPC64 (big endian) builds** ([#17626](astral-sh/uv#17626)) uv no longer provides pre-built binaries for PPC64 (big endian). This platform appears to be largely unused and is only supported on a single manylinux version. PPC64LE (little endian) builds are unaffected. Building uv from source is still supported for this platform. - **Skip generating `activate.csh` for relocatable virtual environments** ([#17759](astral-sh/uv#17759)) Previously, `uv venv --relocatable` would generate an `activate.csh` script that contained hardcoded paths, making it incompatible with relocation. Now, the `activate.csh` script is not generated for relocatable virtual environments. You cannot opt out of this behavior. - **Require username when multiple credentials match a URL** ([#16983](astral-sh/uv#16983)) When using `uv auth login` to store credentials, you can register multiple username and password combinations for the same host. Previously, when uv needed to authenticate and multiple credentials matched the URL (e.g., when retrieving a token with `uv auth token`), uv would pick the first match. Now, uv will error instead. You cannot opt out of this behavior. Include the username in the request, e.g., `uv auth token --username foo example.com`. - **Avoid invalidating the lockfile versions after an `exclude-newer` change** ([#17721](astral-sh/uv#17721)) Previously, changing the `exclude-newer` setting would cause package versions to be upgraded, ignoring the lockfile entirely. Now, uv will only change package versions if they are no longer within the `exclude-newer` range. You can restore the previous behavior by using `--upgrade` or `--upgrade-package` to opt-in to package version changes. - **Upgrade `uv format` to Ruff 0.15.0** ([#17838](astral-sh/uv#17838)) `uv format` now uses [Ruff 0.15.0](https://github.com/astral-sh/ruff/releases/tag/0.15.0), which uses the [2026 style guide](https://astral.sh/blog/ruff-v0.15.0#the-ruff-2026-style-guide). See the blog post for details. The formatting of code is likely to change. You can opt out of this behavior by requesting an older Ruff version, e.g., `uv format --version 0.14.14`. - **Update uv crate test features to use `test-` as a prefix** ([#17860](astral-sh/uv#17860)) This change only affects redistributors of uv. The Cargo features used to gate test dependencies, e.g., `pypi`, have been renamed with a `test-` prefix for clarity, e.g., `test-pypi`. ##### Stabilizations - **`uv python upgrade` and `uv python install --upgrade`** ([#17766](astral-sh/uv#17766)) When installing Python versions, an [intermediary directory](https://docs.astral.sh/uv/concepts/python-versions/#minor-version-directories) without the patch version attached will be created, and virtual environments will be transparently upgraded to new patch versions. See the [Python version documentation](https://docs.astral.sh/uv/concepts/python-versions/#upgrading-python-versions) for more details. - **`uv add --bounds` and the `add-bounds` configuration option** ([#17660](astral-sh/uv#17660)) This does not come with any behavior changes. You will no longer see an experimental warning when using `uv add --bounds` or `add-bounds` in configuration. - **`uv workspace list` and `uv workspace dir`** ([#17768](astral-sh/uv#17768)) This does not come with any behavior changes. You will no longer see an experimental warning when using these commands. - **`extra-build-dependencies`** ([#17767](astral-sh/uv#17767)) This does not come with any behavior changes. You will no longer see an experimental warning when using `extra-build-dependencies` in configuration. ##### Enhancements - Improve ABI tag error message phrasing ([#17878](astral-sh/uv#17878)) - Introduce a 10s connect timeout ([#17733](astral-sh/uv#17733)) - Allow using `pyx.dev` as a target in `uv auth` commands despite `PYX_API_URL` differing ([#17856](astral-sh/uv#17856)) ##### Bug fixes - Support all CPython ABI tag suffixes properly ([#17817](astral-sh/uv#17817)) - Add support for detecting PowerShell on Linux and macOS ([#17870](astral-sh/uv#17870)) - Retry timeout errors for streams ([#17875](astral-sh/uv#17875)) ### [`v0.9.30`](https://github.com/astral-sh/uv/releases/tag/0.9.30) [Compare Source](astral-sh/uv@0.9.29...0.9.30) #### Release Notes Released on 2026-02-04. ##### Python - Add CPython 3.14.3 and 3.13.12 ([#17849](astral-sh/uv#17849)) ##### Enhancements - Allow comma-separated values for `--extra` option ([#17525](astral-sh/uv#17525)) - Check all files during a dry-run publish instead of stopping at the first failure ([#17785](astral-sh/uv#17785)) - Clarify `UV_HTTP_TIMEOUT` error message ([#17493](astral-sh/uv#17493)) ##### Preview features - Use relocatable virtual environments by default ([#17770](astral-sh/uv#17770)) ##### Bug fixes - Fix deadlock on token refresh in `uv publish` when using pyx ([#17832](astral-sh/uv#17832)) - Ignore global Python pins when incompatible with project ([#15473](astral-sh/uv#15473)) #### Install uv 0.9.30 ##### Install prebuilt binaries via shell script ```sh curl --proto '=https' --tlsv1.2 -LsSf https://github.com/astral-sh/uv/releases/download/0.9.30/uv-installer.sh | sh ``` ##### Install prebuilt binaries via powershell script ```sh powershell -ExecutionPolicy Bypass -c "irm https://github.com/astral-sh/uv/releases/download/0.9.30/uv-installer.ps1 | iex" ``` #### Download uv 0.9.30 | File | Platform | Checksum | | --------------------------------------------------------------------------------------------------------------------------------------------- | ---------------------------- | -------------------------------------------------------------------------------------------------------------------- | | [uv-aarch64-apple-darwin.tar.gz](https://github.com/astral-sh/uv/releases/download/0.9.30/uv-aarch64-apple-darwin.tar.gz) | Apple Silicon macOS | [checksum](https://github.com/astral-sh/uv/releases/download/0.9.30/uv-aarch64-apple-darwin.tar.gz.sha256) | | 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Linux | [checksum](https://github.com/astral-sh/uv/releases/download/0.9.30/uv-powerpc64le-unknown-linux-gnu.tar.gz.sha256) | | [uv-riscv64gc-unknown-linux-gnu.tar.gz](https://github.com/astral-sh/uv/releases/download/0.9.30/uv-riscv64gc-unknown-linux-gnu.tar.gz) | RISCV Linux | [checksum](https://github.com/astral-sh/uv/releases/download/0.9.30/uv-riscv64gc-unknown-linux-gnu.tar.gz.sha256) | | [uv-s390x-unknown-linux-gnu.tar.gz](https://github.com/astral-sh/uv/releases/download/0.9.30/uv-s390x-unknown-linux-gnu.tar.gz) | S390x Linux | [checksum](https://github.com/astral-sh/uv/releases/download/0.9.30/uv-s390x-unknown-linux-gnu.tar.gz.sha256) | | 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ARM64 MUSL Linux | [checksum](https://github.com/astral-sh/uv/releases/download/0.9.30/uv-aarch64-unknown-linux-musl.tar.gz.sha256) | | [uv-i686-unknown-linux-musl.tar.gz](https://github.com/astral-sh/uv/releases/download/0.9.30/uv-i686-unknown-linux-musl.tar.gz) | x86 MUSL Linux | [checksum](https://github.com/astral-sh/uv/releases/download/0.9.30/uv-i686-unknown-linux-musl.tar.gz.sha256) | | [uv-x86\_64-unknown-linux-musl.tar.gz](https://github.com/astral-sh/uv/releases/download/0.9.30/uv-x86_64-unknown-linux-musl.tar.gz) | x64 MUSL Linux | [checksum](https://github.com/astral-sh/uv/releases/download/0.9.30/uv-x86_64-unknown-linux-musl.tar.gz.sha256) | | 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These can be verified by using the [GitHub CLI](https://cli.github.com/manual/gh_attestation_verify): ```sh gh attestation verify <file-path of downloaded artifact> --repo astral-sh/uv ``` You can also download the attestation from [GitHub](https://github.com/astral-sh/uv/attestations) and verify against that directly: ```sh gh attestation verify <file-path of downloaded artifact> --bundle <file-path of downloaded attestation> ``` ### [`v0.9.29`](https://github.com/astral-sh/uv/releases/tag/0.9.29) [Compare Source](astral-sh/uv@0.9.28...0.9.29) #### Release Notes Released on 2026-02-03. ##### Python - Update to Pyodide 0.29.3 ([#17730](astral-sh/uv#17730)) ##### Enhancements - Add wheel-tag-style aliases for manylinux platform names ([#17750](astral-sh/uv#17750)) - Hint on `uv version --bump dev` similar to pre-release bumps ([#17796](astral-sh/uv#17796)) - Improve display of RFC 9457 Problem Detail responses in `uv publish` server errors ([#17787](astral-sh/uv#17787)) - Improve the wording of publish errors during dry-run ([#17782](astral-sh/uv#17782)) - Set backoff to 10 retries ([#17816](astral-sh/uv#17816)) - Add properties to synthentic and project roots in Cyclone DX exports ([#17820](astral-sh/uv#17820)) - Identify the invidividual clients in `uv publish` trace logs ([#17784](astral-sh/uv#17784)) ##### Preview features - Remove special casing for `base` and `default` conda environment names ([#17758](astral-sh/uv#17758)) ##### Bug fixes - Fix `PYTHONHOME` inheritance when spawning different Python versions ([#17821](astral-sh/uv#17821)) - Fix wheel rejections on freethreading+debug builds ([#17812](astral-sh/uv#17812)) - Pad with zeros during comparisons in `EqualStar` and `NotEqualStar` operators ([#17751](astral-sh/uv#17751)) - Reject unknown field names in conflict declarations ([#17727](astral-sh/uv#17727)) - Fix panics in `system-configuration` in sandboxes ([#17829](astral-sh/uv#17829)) ##### Documentation - Update pip pre-release compatibility information ([#17788](astral-sh/uv#17788)) ##### Security - Hide a subset of environment variable values in `--help` ([#17745](astral-sh/uv#17745)) #### Install uv 0.9.29 ##### Install prebuilt binaries via shell script ```sh curl --proto '=https' --tlsv1.2 -LsSf https://github.com/astral-sh/uv/releases/download/0.9.29/uv-installer.sh | sh ``` ##### Install prebuilt binaries via powershell script ```sh powershell -ExecutionPolicy Bypass -c "irm https://github.com/astral-sh/uv/releases/download/0.9.29/uv-installer.ps1 | iex" ``` #### Download uv 0.9.29 | File | Platform | Checksum | | --------------------------------------------------------------------------------------------------------------------------------------------- | ---------------------------- | -------------------------------------------------------------------------------------------------------------------- | | [uv-aarch64-apple-darwin.tar.gz](https://github.com/astral-sh/uv/releases/download/0.9.29/uv-aarch64-apple-darwin.tar.gz) | Apple Silicon macOS | [checksum](https://github.com/astral-sh/uv/releases/download/0.9.29/uv-aarch64-apple-darwin.tar.gz.sha256) | | [uv-x86\_64-apple-darwin.tar.gz](https://github.com/astral-sh/uv/releases/download/0.9.29/uv-x86_64-apple-darwin.tar.gz) | Intel macOS | [checksum](https://github.com/astral-sh/uv/releases/download/0.9.29/uv-x86_64-apple-darwin.tar.gz.sha256) | | [uv-aarch64-pc-windows-msvc.zip](https://github.com/astral-sh/uv/releases/download/0.9.29/uv-aarch64-pc-windows-msvc.zip) | ARM64 Windows | [checksum](https://github.com/astral-sh/uv/releases/download/0.9.29/uv-aarch64-pc-windows-msvc.zip.sha256) | | [uv-i686-pc-windows-msvc.zip](https://github.com/astral-sh/uv/releases/download/0.9.29/uv-i686-pc-windows-msvc.zip) | x86 Windows | [checksum](https://github.com/astral-sh/uv/releases/download/0.9.29/uv-i686-pc-windows-msvc.zip.sha256) | | [uv-x86\_64-pc-windows-msvc.zip](https://github.com/astral-sh/uv/releases/download/0.9.29/uv-x86_64-pc-windows-msvc.zip) | x64 Windows | [checksum](https://github.com/astral-sh/uv/releases/download/0.9.29/uv-x86_64-pc-windows-msvc.zip.sha256) | | [uv-aarch64-unknown-linux-gnu.tar.gz](https://github.com/astral-sh/uv/releases/download/0.9.29/uv-aarch64-unknown-linux-gnu.tar.gz) | ARM64 Linux | [checksum](https://github.com/astral-sh/uv/releases/download/0.9.29/uv-aarch64-unknown-linux-gnu.tar.gz.sha256) | | [uv-i686-unknown-linux-gnu.tar.gz](https://github.com/astral-sh/uv/releases/download/0.9.29/uv-i686-unknown-linux-gnu.tar.gz) | x86 Linux | [checksum](https://github.com/astral-sh/uv/releases/download/0.9.29/uv-i686-unknown-linux-gnu.tar.gz.sha256) | | [uv-powerpc64-unknown-linux-gnu.tar.gz](https://github.com/astral-sh/uv/releases/download/0.9.29/uv-powerpc64-unknown-linux-gnu.tar.gz) | PPC64 Linux | [checksum](https://github.com/astral-sh/uv/releases/download/0.9.29/uv-powerpc64-unknown-linux-gnu.tar.gz.sha256) | | [uv-powerpc64le-unknown-linux-gnu.tar.gz](https://github.com/astral-sh/uv/releases/download/0.9.29/uv-powerpc64le-unknown-linux-gnu.tar.gz) | PPC64LE Linux | [checksum](https://github.com/astral-sh/uv/releases/download/0.9.29/uv-powerpc64le-unknown-linux-gnu.tar.gz.sha256) | | [uv-riscv64gc-unknown-linux-gnu.tar.gz](https://github.com/astral-sh/uv/releases/download/0.9.29/uv-riscv64gc-unknown-linux-gnu.tar.gz) | RISCV Linux | [checksum](https://github.com/astral-sh/uv/releases/download/0.9.29/uv-riscv64gc-unknown-linux-gnu.tar.gz.sha256) | | [uv-s390x-unknown-linux-gnu.tar.gz](https://github.com/astral-sh/uv/releases/download/0.9.29/uv-s390x-unknown-linux-gnu.tar.gz) | S390x Linux | [checksum](https://github.com/astral-sh/uv/releases/download/0.9.29/uv-s390x-unknown-linux-gnu.tar.gz.sha256) | | [uv-x86\_64-unknown-linux-gnu.tar.gz](https://github.com/astral-sh/uv/releases/download/0.9.29/uv-x86_64-unknown-linux-gnu.tar.gz) | x64 Linux | [checksum](https://github.com/astral-sh/uv/releases/download/0.9.29/uv-x86_64-unknown-linux-gnu.tar.gz.sha256) | | [uv-armv7-unknown-linux-gnueabihf.tar.gz](https://github.com/astral-sh/uv/releases/download/0.9.29/uv-armv7-unknown-linux-gnueabihf.tar.gz) | ARMv7 Linux | [checksum](https://github.com/astral-sh/uv/releases/download/0.9.29/uv-armv7-unknown-linux-gnueabihf.tar.gz.sha256) | | [uv-aarch64-unknown-linux-musl.tar.gz](https://github.com/astral-sh/uv/releases/download/0.9.29/uv-aarch64-unknown-linux-musl.tar.gz) | ARM64 MUSL Linux | [checksum](https://github.com/astral-sh/uv/releases/download/0.9.29/uv-aarch64-unknown-linux-musl.tar.gz.sha256) | | [uv-i686-unknown-linux-musl.tar.gz](https://github.com/astral-sh/uv/releases/download/0.9.29/uv-i686-unknown-linux-musl.tar.gz) | x86 MUSL Linux | [checksum](https://github.com/astral-sh/uv/releases/download/0.9.29/uv-i686-unknown-linux-musl.tar.gz.sha256) | | [uv-x86\_64-unknown-linux-musl.tar.gz](https://github.com/astral-sh/uv/releases/download/0.9.29/uv-x86_64-unknown-linux-musl.tar.gz) | x64 MUSL Linux | [checksum](https://github.com/astral-sh/uv/releases/download/0.9.29/uv-x86_64-unknown-linux-musl.tar.gz.sha256) | | [uv-arm-unknown-linux-musleabihf.tar.gz](https://github.com/astral-sh/uv/releases/download/0.9.29/uv-arm-unknown-linux-musleabihf.tar.gz) | ARMv6 MUSL Linux (Hardfloat) | [checksum](https://github.com/astral-sh/uv/releases/download/0.9.29/uv-arm-unknown-linux-musleabihf.tar.gz.sha256) | | [uv-armv7-unknown-linux-musleabihf.tar.gz](https://github.com/astral-sh/uv/releases/download/0.9.29/uv-armv7-unknown-linux-musleabihf.tar.gz) | ARMv7 MUSL Linux | [checksum](https://github.com/astral-sh/uv/releases/download/0.9.29/uv-armv7-unknown-linux-musleabihf.tar.gz.sha256) | #### Verifying GitHub Artifact Attestations The artifacts in this release have attestations generated with GitHub Artifact Attestations. These can be verified by using the [GitHub CLI](https://cli.github.com/manual/gh_attestation_verify): ```sh gh attestation verify <file-path of downloaded artifact> --repo astral-sh/uv ``` You can also download the attestation from [GitHub](https://github.com/astral-sh/uv/attestations) and verify against that directly: ```sh gh attestation verify <file-path of downloaded artifact> --bundle <file-path of downloaded attestation> ``` </details> --- ### Configuration 📅 **Schedule**: Branch creation - At any time (no schedule defined), Automerge - At any time (no schedule defined). 🚦 **Automerge**: Disabled by config. Please merge this manually once you are satisfied. ♻ **Rebasing**: Whenever MR becomes conflicted, or you tick the rebase/retry checkbox. 🔕 **Ignore**: Close this MR and you won't be reminded about this update again. --- - [ ] If you want to rebase/retry this MR, check this box --- This MR has been generated by [Renovate Bot](https://github.com/renovatebot/renovate).

Fix PYTHONHOME inheritance when spawning different Python versions

b848e70

konstin requested a review from zanieb February 2, 2026 20:58

konstin added the bug Something isn't working label Feb 2, 2026

mmangkad marked this pull request as draft February 3, 2026 14:26

Use UV_INTERNAL__PYTHONHOME marker to preserve user-set PYTHONHOME

708ffd0

mmangkad marked this pull request as ready for review February 3, 2026 16:26

zanieb approved these changes Feb 3, 2026

View reviewed changes

Regenerate trampolines

5777d08

zanieb enabled auto-merge (squash) February 3, 2026 17:12

zanieb merged commit 396ff56 into astral-sh:main Feb 3, 2026
77 checks passed

mmangkad deleted the fix-pythonhome-inheritance branch February 3, 2026 17:58

BrewTestBot mentioned this pull request Feb 3, 2026

uv 0.9.29 Homebrew/homebrew-core#265738

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Fix `PYTHONHOME` inheritance when spawning different Python versions#17821

Fix `PYTHONHOME` inheritance when spawning different Python versions#17821
zanieb merged 3 commits intoastral-sh:mainfrom
mmangkad:fix-pythonhome-inheritance

mmangkad commented Feb 2, 2026

Uh oh!

EliteTK commented Feb 3, 2026

Uh oh!

mmangkad commented Feb 3, 2026

Uh oh!

EliteTK commented Feb 3, 2026

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zanieb commented Feb 3, 2026

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mmangkad commented Feb 3, 2026

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mmangkad commented Feb 2, 2026

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EliteTK commented Feb 3, 2026

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mmangkad commented Feb 3, 2026

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EliteTK commented Feb 3, 2026

Uh oh!

zanieb commented Feb 3, 2026

Uh oh!

mmangkad commented Feb 3, 2026

Uh oh!

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