Refine documentation in interpreter.rs #6566
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Improve InterpreterConfig with convenience methods (with_debug, add_path, add_paths), better documentation with working examples, refactored stdlib setup into focused functions, and comprehensive unit tests while maintaining 100% backward compatibility.
📝 WalkthroughWalkthroughInterpreterConfig gains builder-style methods (with_debug, add_path, add_paths, init_stdlib). add_native_module now accepts a function pointer and is boxed internally. Stdlib initialization moved into helper functions that choose frozen vs dynamic setup based on feature flags. Tests and docs updated accordingly. Changes
Sequence Diagram(s)sequenceDiagram
participant Client as Client Code
participant Config as InterpreterConfig
participant VM as VirtualMachine
participant Stdlib as Stdlib Setup
Client->>Config: build config (with_debug, add_path(s))
Client->>Config: call init_stdlib()
Config->>VM: start VM with config
VM->>VM: call init_stdlib(vm)
alt feature: "freeze-stdlib"
VM->>Stdlib: setup_frozen_stdlib(vm)
Stdlib-->>VM: register frozen modules, set _stdlib_dir
else feature: NOT "freeze-stdlib"
VM->>Stdlib: collect_stdlib_paths()
Stdlib-->>VM: return additional paths
VM->>Stdlib: setup_dynamic_stdlib(vm)
Stdlib-->>VM: extend module_search_paths
end
VM-->>Client: VM ready (native modules & stdlib initialized)
Estimated code review effort🎯 3 (Moderate) | ⏱️ ~25 minutes Poem
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Actionable comments posted: 1
🧹 Nitpick comments (2)
src/interpreter.rs (2)
130-135: Reconsider usingeprintln!in library code.Libraries typically shouldn't print to stderr without user control. Since this is gated by a compile-time feature, consider these alternatives:
- Use
compile_error!to fail compilation if stdlib is expected but the feature isn't enabled- Document this behavior clearly and let users handle it
- Use a logging crate with appropriate log levels
The current approach will print the warning every time
init_stdlib()is called, which could spam output in applications that create multiple interpreters.
261-301: Consider expanding test coverage.The unit tests provide good coverage of the configuration builder methods. Consider adding integration tests that:
- Verify interpreter creation with various configurations
- Test stdlib initialization in both frozen and dynamic modes
- Validate native module registration
These would provide more confidence that the refactored initialization logic works correctly end-to-end.
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**/*.rs: Follow the default rustfmt code style by runningcargo fmtto format Rust code
Always run clippy to lint 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:
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src/interpreter.rs (1)
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split_paths(345-351)split_paths(358-365)
🔇 Additional comments (4)
src/interpreter.rs (4)
5-49: Documentation examples look good overall.The examples are comprehensive and well-structured. The use of
no_runis appropriate since these require runtime context. Thetodo!()placeholder in the example at line 39 is acceptable for documentation purposes as it compiles and makes it clear the user needs to implement their own logic.
137-186: Well-implemented convenience methods.The new builder-style methods (
with_debug,add_path,add_paths) are well-designed with proper lazy initialization of settings viaget_or_insert_with. The generic implementation ofadd_pathsprovides good flexibility for various input types.
106-114: This review comment contains a factual error. Theadd_native_modulemethod was introduced with thefn(&VirtualMachine) -> PyRef<PyModule>signature in commit 3737f2a and has never been changed from aBox<dyn FnOnce>signature. This is not a breaking change—it is the original design. The method has always accepted function pointers only, not closures with captures, so no functionality was removed.Likely an incorrect or invalid review comment.
207-221: The assert! and unwrap() pattern should be replaced with proper error handling.While
setup_frozen_stdlibis guaranteed to execute only once per VM instance (theinit_hooksare executed exactly once duringInterpreter::with_initvia aFnOnceclosure), the use ofassert!at line 213 and.unwrap()at line 220 is still poor error handling. Replace these with explicit error handling or return aResulttype to gracefully handle cases where_stdlib_diralready exists or the attribute setting fails.
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⚠️ Outside diff range comments (1)
src/interpreter.rs (1)
106-114: Breaking change: restrictingmake_moduleto function pointers.The signature change from
Box<dyn FnOnce(&VirtualMachine) -> PyRef<PyModule>>tofn(&VirtualMachine) -> PyRef<PyModule>is more restrictive and breaks backward compatibility. Function pointers cannot capture variables from their environment, so existing code that passes closures with captures will fail to compile.This contradicts the PR's claim of "100% backward compatibility."
Example of code that would break:
let module_name = "custom".to_string(); config.add_native_module( "mymod".to_owned(), |vm| { // Error: closure captures `module_name`, but fn pointer required vm.ctx.new_module(&module_name, /* ... */) } )Consider reverting to
Box<dyn FnOnce(&VirtualMachine) -> PyRef<PyModule>>or providing a migration path with deprecation warnings.
🧹 Nitpick comments (3)
src/interpreter.rs (3)
125-135: Consider warning only once or document the repeated warning behavior.The
eprintln!will execute every timeinit_stdlib()is called on the builder chain. While this alerts users to the missingstdlibfeature, it could print multiple warnings if called multiple times (though typically called once). Consider documenting this behavior or using aonce_cellto warn only on first call.
262-302: Consider expanding test coverage for new functionality.The tests appropriately cover the builder methods (
with_debug,add_path,add_paths) but are limited to verifying configuration state. Consider adding tests for:
init_stdlibinitialization (if testable in unit test context)add_native_moduleregistration- Actual interpreter creation with various configurations
- Helper functions (
setup_frozen_stdlib,setup_dynamic_stdlib,collect_stdlib_paths)Note: Some of these may require integration tests rather than unit tests.
227-238: Consider adding a descriptive error message for initialization clarity.Line 230 uses
.unwrap()onPyRc::get_mut(&mut vm.state), which is safe during initialization due to exclusive access via&mut VirtualMachine. To improve debuggability, use.expect()instead:let state = PyRc::get_mut(&mut vm.state) .expect("vm.state must have exclusive access during initialization");This provides better context in the unlikely event of a panic and documents the initialization assumption.
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**/*.rs: Follow the default rustfmt code style by runningcargo fmtto format Rust code
Always run clippy to lint 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:
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🧠 Learnings (2)
📚 Learning: 2025-09-28T22:22:55.921Z
Learnt from: reactive-firewall
Repo: RustPython/RustPython PR: 6176
File: .github/workflows/Check_Tests.yml:133-141
Timestamp: 2025-09-28T22:22:55.921Z
Learning: In the RustPython project's CI-5974-Test-RustPython-Integration action, the override-rustpython-path input is marked as required but has runtime fallback logic that defaults to RUSTPYTHONPATH environment variable or "Lib" if neither is provided, making explicit specification unnecessary in most cases.
Applied to files:
src/interpreter.rs
📚 Learning: 2025-06-28T16:31:03.991Z
Learnt from: arihant2math
Repo: RustPython/RustPython PR: 5790
File: build.rs:2-2
Timestamp: 2025-06-28T16:31:03.991Z
Learning: In Cargo build scripts (build.rs), the environment variable CARGO_CFG_TARGET_OS is guaranteed to exist and is automatically set by Cargo during the build process, making unwrap() safe to use when accessing this variable.
Applied to files:
src/interpreter.rs
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src/interpreter.rs (1)
src/settings.rs (2)
split_paths(345-351)split_paths(358-365)
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🔇 Additional comments (3)
src/interpreter.rs (3)
5-49: Well-structured documentation with clear examples.The expanded documentation provides clear usage patterns for basic configuration, settings override, and native module registration. The use of
no_runis appropriate, and the inline comments (lines 24-25) help clarify path purposes.
146-149: LGTM! Well-implemented convenience methods.The new builder methods (
with_debug,add_path,add_paths) follow a consistent pattern usingget_or_insert_with(Default::default)to lazily initialize settings. The generic bounds onadd_pathsprovide good flexibility while maintaining type safety.Also applies to: 161-167, 178-186
244-260: LGTM! Path handling properly addresses previous review.The use of
unwrap_or_elsewith a descriptive error message (lines 251-252) properly addresses the previous review comment and matches the pattern used insettings.rs. This provides clear context for debugging non-Unicode path failures.Based on learnings, the approach follows established patterns in the codebase.
| fn setup_frozen_stdlib(vm: &mut VirtualMachine) { | ||
| vm.add_frozen(rustpython_pylib::FROZEN_STDLIB); | ||
|
|
||
| // FIXME: Remove this hack once sys._stdlib_dir is properly implemented | ||
| // or _frozen_importlib doesn't depend on it anymore. | ||
| // The assert ensures _stdlib_dir doesn't already exist before we set it | ||
| assert!(vm.sys_module.get_attr("_stdlib_dir", vm).is_err()); | ||
| vm.sys_module | ||
| .set_attr( | ||
| "_stdlib_dir", | ||
| vm.new_pyobj(rustpython_pylib::LIB_PATH.to_owned()), | ||
| vm, | ||
| ) | ||
| .unwrap(); | ||
| } |
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The assert! on _stdlib_dir is safe and protected by initialization order.
The sys module is created as an empty struct in VirtualMachine::new(), and setup_frozen_stdlib() runs as an init hook before stdlib::sys::init_module() is called in vm.initialize(). Since no code path sets _stdlib_dir before this function, the attribute will not exist at the time of the assertion.
However, the current assert! panics without context. Consider replacing it with a more informative check:
if vm.sys_module.get_attr("_stdlib_dir", vm).is_ok() {
panic!("sys._stdlib_dir already exists; stdlib initialization called in unexpected order");
}This provides better debugging information if the initialization invariant is ever violated.
🤖 Prompt for AI Agents
In src/interpreter.rs around lines 207 to 221, replace the bare assert! checking
that sys._stdlib_dir does not already exist with an explicit conditional that
checks vm.sys_module.get_attr("_stdlib_dir", vm).is_ok() and, if true, panic
with a clear message like "sys._stdlib_dir already exists; stdlib initialization
called in unexpected order" so the code fails with informative context rather
than a plain panic; keep the subsequent set_attr call and unwrap as-is.
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Thank you for contributing! I like the new functions split out.
I will read the change more later, but I have question about adding no_run to every doctests. Do you have any motivation to do that?
| /// ``` | ||
| /// let interpreter = rustpython::InterpreterConfig::new() | ||
| /// # Basic Usage | ||
| /// ```no_run |
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Is there benefits to add no_run here?
no_run means the code can be outdated easy without doctest
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The original code used compile_fail, which indicates the example is expected to fail compilation. However the code is valid and should compile successfully it just can't run in a doc test environment so I changed it to no_run for clarity.
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Only one test had compile_fail, and the others were possible to be run on doc test environment.
src/interpreter.rs
Outdated
| /// })) | ||
| /// .add_native_module( | ||
| /// "your_module_name".to_owned(), | ||
| /// make_custom_module, |
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| /// make_custom_module, | |
| /// your_module::make_module, |
keeping make_module is important. it is literally the function name created by #[pymodule]
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Thank you for the feedback! I've updated the documentation examples to consistently use make_module following the RustPython convention. The changes have been pushed.
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Actionable comments posted: 0
♻️ Duplicate comments (1)
src/interpreter.rs (1)
203-221: The bareassert!lacks debugging context.While the assertion is safe due to initialization order guarantees, it provides no context when it fails. As suggested in previous review comments, consider replacing it with an explicit check and informative panic message:
if vm.sys_module.get_attr("_stdlib_dir", vm).is_ok() { panic!("sys._stdlib_dir already exists; stdlib initialization called in unexpected order"); }This makes debugging easier if the initialization invariant is ever violated.
🧹 Nitpick comments (1)
src/interpreter.rs (1)
116-135: LGTM! Clear feature-gated behavior.The feature-gated variants of
init_stdlibcorrectly handle both compile-time configurations. The runtime warning in the no-op variant provides helpful feedback to developers.Optional: Consider compile-time warning instead
For production binaries, you might prefer a compile-time warning instead of a runtime
eprintln!:#[cfg(not(feature = "stdlib"))] pub fn init_stdlib(self) -> Self { - eprintln!( - "Warning: stdlib feature is not enabled. Standard library will not be available." - ); self }This prevents the message from appearing every time
init_stdlib()is called in configurations where it's intentionally disabled.
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**/*.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 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
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🧠 Learnings (4)
📚 Learning: 2025-09-28T22:22:55.921Z
Learnt from: reactive-firewall
Repo: RustPython/RustPython PR: 6176
File: .github/workflows/Check_Tests.yml:133-141
Timestamp: 2025-09-28T22:22:55.921Z
Learning: In the RustPython project's CI-5974-Test-RustPython-Integration action, the override-rustpython-path input is marked as required but has runtime fallback logic that defaults to RUSTPYTHONPATH environment variable or "Lib" if neither is provided, making explicit specification unnecessary in most cases.
Applied to files:
src/interpreter.rs
📚 Learning: 2025-06-28T16:31:03.991Z
Learnt from: arihant2math
Repo: RustPython/RustPython PR: 5790
File: build.rs:2-2
Timestamp: 2025-06-28T16:31:03.991Z
Learning: In Cargo build scripts (build.rs), the environment variable CARGO_CFG_TARGET_OS is guaranteed to exist and is automatically set by Cargo during the build process, making unwrap() safe to use when accessing this variable.
Applied to files:
src/interpreter.rs
📚 Learning: 2025-12-27T14:03:49.011Z
Learnt from: CR
Repo: RustPython/RustPython PR: 0
File: .github/copilot-instructions.md:0-0
Timestamp: 2025-12-27T14:03:49.011Z
Learning: Applies to **/*.rs : Use the macro system (`pyclass`, `pymodule`, `pyfunction`, etc.) when implementing Python functionality in Rust
Applied to files:
src/interpreter.rs
📚 Learning: 2025-12-27T14:03:49.011Z
Learnt from: CR
Repo: RustPython/RustPython PR: 0
File: .github/copilot-instructions.md:0-0
Timestamp: 2025-12-27T14:03:49.011Z
Learning: Applies to **/*test*.py : When a test cannot pass due to missing language features, keep it as expectedFailure and document the reason; do not comment it out
Applied to files:
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src/interpreter.rs (1)
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split_paths(345-351)split_paths(358-365)
🔇 Additional comments (6)
src/interpreter.rs (6)
5-49: LGTM! Excellent documentation improvements.The expanded documentation provides clear, practical examples covering the main use cases. The consistent use of
make_modulenaming aligns with RustPython conventions, and theno_runattribute is appropriately applied for examples that require a full runtime environment.
137-186: LGTM! Well-designed builder methods.The convenience methods follow idiomatic Rust builder patterns with appropriate lazy initialization of settings. The generic bounds on
add_pathsprovide good ergonomics while maintaining type safety.
189-201: LGTM! Clean stdlib initialization orchestration.The refactored
init_stdlibfunction clearly delegates to feature-specific implementations. The separation of concerns between frozen and dynamic stdlib handling improves maintainability.
223-260: LGTM! Proper handling of dynamic stdlib paths.The dynamic stdlib setup correctly:
- Collects paths from
BUILDTIME_RUSTPYTHONPATHor defaults- Provides informative panic messages for invalid Unicode (line 252)
- Inserts stdlib paths at the beginning to prioritize them over user paths
262-302: LGTM! Comprehensive test coverage.The test suite appropriately covers the new builder methods:
- Default configuration state
- Debug level setting
- Single and sequential path additions
- Batch path additions
The tests verify expected behavior without unnecessary complexity.
106-114: LGTM! API simplification improves ergonomics.The signature change from
Box<dyn FnOnce...>tofn(...)simplifies the public API by accepting function pointers directly and boxing them internally. This reduces boilerplate for callers while maintaining the same functionality.
| /// fn make_module(vm: &VirtualMachine) -> PyRef<PyModule> { | ||
| /// // Your module implementation | ||
| /// # todo!() | ||
| /// } |
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This is still misleading about making a module.
| /// fn make_module(vm: &VirtualMachine) -> PyRef<PyModule> { | |
| /// // Your module implementation | |
| /// # todo!() | |
| /// } | |
| /// #[pymodule] | |
| /// mod your_module {} |
| /// })) | ||
| /// .add_native_module( | ||
| /// "your_module_name".to_owned(), | ||
| /// make_module, // ← use make_module |
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| /// make_module, // ← use make_module | |
| /// your_module::make_module |
| /// Build the interpreter with the current configuration | ||
| /// | ||
| /// # Panics | ||
| /// May panic if initialization hooks encounter fatal errors |
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hmm, this is a caveat of vm init, but probably helpful
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| /// Add a custom initialization hook | ||
| /// | ||
| /// Hooks are executed in the order they are added during interpreter creation |
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| /// Hooks are executed in the order they are added during interpreter creation | |
| /// This function is the only path in the entire interpreter through which a mutable reference to the VirtualMachine can be obtained. | |
| /// Hooks are executed in the order they are added during interpreter creation |
| /// When the `stdlib` feature is not enabled, this method does nothing | ||
| /// and prints a warning. Enable the `stdlib` feature to use the standard library. | ||
| #[cfg(not(feature = "stdlib"))] | ||
| pub fn init_stdlib(self) -> Self { |
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Is this useful? Users get compile error when no feature set. But after changes, it became runtime error.
| #[test] | ||
| fn test_default_config() { | ||
| let config = InterpreterConfig::new(); | ||
| assert!(config.settings.is_none()); | ||
| assert!(config.init_hooks.is_empty()); | ||
| } |
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I really appreciate the effort to improve RustPython.
If you used AI assistance here, could you please double-check that the changes match your intent? I’m not sure some changes are actually reviewed by you.
I’m not saying that this patch is without value or that it’s doing the wrong thing. I generally agree with the direction of this patch, but I would appreciate a version that has been reviewed a bit more carefully.
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Could you open it again? we can finish it. |
2 participants
Improve InterpreterConfig with convenience methods (with_debug, add_path, add_paths), better documentation with working examples, refactored stdlib setup into focused functions, and comprehensive unit tests while maintaining 100% backward compatibility.
Summary by CodeRabbit
New Features
API Changes
Tests
Documentation
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