Pyfunction builtins and constructor #5823

youknowone · 2025-06-23T00:46:21Z

Summary by CodeRabbit

New Features
- Added support for accessing the built-in namespace from Python function objects.
- Enabled creation of Python function objects directly from Python code with enhanced argument options.
Bug Fixes
- Improved validation for function closures to ensure correct structure and compatibility.
Refactor
- Streamlined function object creation, removing redundant attribute assignments and simplifying argument handling.
Tests
- Removed expected failure marker from a namedtuple test, indicating resolved test stability.

coderabbitai · 2025-06-23T00:46:26Z

Walkthrough

The changes update the PyFunction struct to include a builtins field and modify its constructor to initialize this field using the provided globals or context. The constructor now returns a PyResult. Python-level construction of PyFunction is enabled via a new argument struct and trait implementation. Related adjustments are made in function creation logic, removing explicit attribute settings and module retrieval. A test decorator marking expected failure was removed.

Changes

File(s)	Change Summary
vm/src/builtins/function.rs	Added `builtins` field to `PyFunction`, updated constructor to set it, changed return type to `PyResult`, added Python-level constructor and argument parsing, exposed `builtins` as a property.
vm/src/frame.rs	Updated function creation to match new `PyFunction::new` signature, removed explicit setting of `__name__`, `__qualname__`, and `__doc__`, and omitted module retrieval.
Lib/test/test_collections.py	Removed `@unittest.expectedFailure` decorator and preceding TODO comment from `test_new_builtins_issue_43102` test method.

Sequence Diagram(s)

sequenceDiagram
    participant VM as VirtualMachine
    participant Frame as ExecutingFrame
    participant PyFunc as PyFunction

    Frame->>VM: Request to create PyFunction (with code, globals, etc.)
    VM->>PyFunc: Call PyFunction::new(...) with vm reference
    PyFunc->>PyFunc: Initialize builtins from globals or VM context
    PyFunc-->>VM: Return new PyFunction or error
    VM-->>Frame: Push PyFunction to stack

Poem

In the warren of code, a function was born,
With builtins now bundled, its logic adorned.
Constructors made clever, with arguments new,
Python can craft it, as rabbits would do.
A hop and a skip, through globals it gleans—
The magic of builtins, now part of its means!
🐇✨

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📥 Commits

Reviewing files that changed from the base of the PR and between edb7934 and 67dbf42.

📒 Files selected for processing (3)

Lib/test/test_collections.py (0 hunks)
vm/src/builtins/function.rs (7 hunks)
vm/src/frame.rs (1 hunks)

💤 Files with no reviewable changes (1)

Lib/test/test_collections.py

🚧 Files skipped from review as they are similar to previous changes (1)

vm/src/frame.rs

🧰 Additional context used

📓 Path-based instructions (1)

`**/*.rs`: Follow the default rustfmt code style; use 'cargo fmt' to format Rust code. Always run clippy to lint Rust code ('cargo clippy') before completing tasks, and fix any war...

**/*.rs: Follow the default rustfmt code style; use 'cargo fmt' to format Rust code.
Always run clippy to lint Rust code ('cargo clippy') before completing tasks, and fix any warnings or lints introduced by your changes.

vm/src/builtins/function.rs

⏰ Context from checks skipped due to timeout of 90000ms (1)

GitHub Check: Check Rust code with rustfmt and clippy

🔇 Additional comments (6)

vm/src/builtins/function.rs (6)

34-34: LGTM! Proper struct field addition.

The new builtins field is correctly added to the struct and follows the existing pattern.

57-103: Well-implemented constructor changes with proper error handling.

The constructor changes are well-structured:

Proper parameter addition for VirtualMachine

Correct fallback logic for builtins resolution

Appropriate error propagation with PyResult

The builtins resolution logic properly handles the hierarchy: globals → current frame → VM builtins.

385-385: LGTM! Proper trait addition for constructor support.

The Constructor trait is correctly added to enable Python-level construction of PyFunction objects.

429-433: LGTM! Well-implemented builtins getter method.

The getter method correctly follows the existing pattern for accessing the builtins field and properly handles the PyResult return type.

584-598: LGTM! Well-structured argument struct for constructor.

The PyFunctionNewArgs struct properly defines the required and optional arguments with appropriate types and decorators.

600-657: Comprehensive constructor implementation with proper validation.

The Constructor implementation is well-structured with:

Proper closure validation and length checking

Appropriate error messages for validation failures

Correct handling of optional parameters

Proper type conversion for the tuple of cells

The implementation follows Rust and PyO3 best practices for constructor functions.

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youknowone · 2025-06-23T00:46:50Z

vm/src/builtins/function.rs

+        // let name = qualname.as_str().split('.').next_back().unwrap();
+        // func.set_attr(identifier!(vm, __name__), vm.new_pyobj(name), vm)?;
+        // func.set_attr(identifier!(vm, __qualname__), qualname, vm)?;
+        // func.set_attr(identifier!(vm, __doc__), doc, vm)?;


check if this is required

youknowone commented Jun 23, 2025

View reviewed changes

youknowone force-pushed the pyfunction branch from edb7934 to 6cbbeb2 Compare June 23, 2025 13:38

youknowone added 2 commits June 23, 2025 23:30

func builtins

9bbaf5a

PyFunction constructor

67dbf42

youknowone force-pushed the pyfunction branch from 6cbbeb2 to 67dbf42 Compare June 23, 2025 14:30

youknowone merged commit 3566dca into RustPython:main Jun 24, 2025
12 checks passed

youknowone deleted the pyfunction branch June 24, 2025 01:23

coderabbitai bot mentioned this pull request Jun 25, 2025

Remove redundent to_owned() and to_string() calls #5836

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