✨ feat(create): add RustPython support#3071
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Co-Authored-By: elmjag <elmjag@users.noreply.github.com>
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This was referenced Mar 19, 2026
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virtualenv currently supports CPython, PyPy, and GraalPy as target interpreters for virtual environment creation. This PR adds RustPython as a fourth supported implementation, enabling
virtualenv -p rustpython venvto work out of the box. 🦀The implementation follows the same pattern as GraalPy — a builtin creator pair (
RustPythonPosix/RustPythonWindows) inheriting from the sharedViaGlobalRefVirtualenvBuiltinbase. RustPython is simpler than CPython/PyPy since it ships as a single monolithic binary with no shared libraries to copy. The creator registersrustpythonas an executable stem alongside the standardpython/python3names, and the discovery layer learns to proberustpythonbinaries as POSIX fallback candidates.CI downloads pre-built RustPython binaries from their weekly GitHub releases for Linux x86_64, macOS aarch64, and Windows x86_64. Since RustPython cannot yet run pytest (parser limitation with set comprehension expressions), the
rptox environment uses CPython to execute tests while rustpython is available on PATH for integration testing. The tox requirement is bumped to>=4.45which includes a fix for circularset_envresolution with lazy constants like{env_site_packages_dir}.Closes #3010.