fix sys path#6537
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📝 WalkthroughWalkthroughThe changes reorder sys.path[0] initialization in lib.rs to align with CPython's behavior: site import now precedes path setup, with per-mode conditional path0 computation. Additionally, settings.rs filters empty environment variable values before path splitting to prevent empty strings from propagating through PATH-like variables. Changes
Estimated code review effort🎯 3 (Moderate) | ⏱️ ~20 minutes Possibly related PRs
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Pre-merge checks and finishing touches❌ Failed checks (1 warning)
✅ Passed checks (2 passed)
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Actionable comments posted: 1
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⛔ Files ignored due to path filters (1)
Lib/test/test_cmd_line_script.pyis excluded by!Lib/**
📒 Files selected for processing (2)
src/lib.rssrc/settings.rs
🧰 Additional context used
📓 Path-based instructions (1)
**/*.rs
📄 CodeRabbit inference engine (.github/copilot-instructions.md)
**/*.rs: Follow the default rustfmt code style by runningcargo fmtto format Rust code
Always run clippy to lint Rust code (cargo clippy) before completing tasks and fix any warnings or lints introduced by changes
Follow Rust best practices for error handling and memory management
Use the macro system (pyclass,pymodule,pyfunction, etc.) when implementing Python functionality in Rust
Files:
src/lib.rssrc/settings.rs
🧠 Learnings (2)
📓 Common learnings
Learnt from: CR
Repo: RustPython/RustPython PR: 0
File: .github/copilot-instructions.md:0-0
Timestamp: 2025-11-29T12:17:28.606Z
Learning: Applies to Lib/**/*.py : Minimize modifications to CPython standard library files in the `Lib/` directory; modifications should be minimal and only to work around RustPython limitations
Learnt from: moreal
Repo: RustPython/RustPython PR: 5847
File: vm/src/stdlib/stat.rs:547-567
Timestamp: 2025-06-27T14:47:28.810Z
Learning: In RustPython's stat module implementation, platform-specific constants like SF_SUPPORTED and SF_SYNTHETIC should be conditionally declared only for the platforms where they're available (e.g., macOS), following CPython's approach of optional declaration rather than providing fallback values for other platforms.
Learnt from: moreal
Repo: RustPython/RustPython PR: 5847
File: vm/src/stdlib/stat.rs:547-567
Timestamp: 2025-06-27T14:47:28.810Z
Learning: In RustPython's stat module implementation, platform-specific constants like SF_SUPPORTED and SF_SYNTHETIC should be conditionally declared only for the platforms where they're available (e.g., macOS), following CPython's approach of optional declaration using #ifdef checks rather than providing fallback values for other platforms.
📚 Learning: 2025-11-29T12:17:28.606Z
Learnt from: CR
Repo: RustPython/RustPython PR: 0
File: .github/copilot-instructions.md:0-0
Timestamp: 2025-11-29T12:17:28.606Z
Learning: Applies to Lib/**/*.py : Minimize modifications to CPython standard library files in the `Lib/` directory; modifications should be minimal and only to work around RustPython limitations
Applied to files:
src/lib.rs
🔇 Additional comments (2)
src/settings.rs (1)
342-342: LGTM!The filter correctly prevents empty environment variables from being split and propagated as empty path entries. This improves robustness when handling PATH-like environment variables.
src/lib.rs (1)
172-181: LGTM!The reordering to import site before configuring sys.path[0] correctly aligns with CPython's behavior. The comment clearly explains the rationale, and error handling is appropriate.
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youknowone
merged commit 57b4b4a
into
RustPython:main
Dec 26, 2025
Summary by CodeRabbit
Bug Fixes
Refactor
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