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Update tomllib from 3.13.5 #5902

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merged 1 commit into from
Jul 4, 2025
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coderabbitai bot commented Jul 4, 2025

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Summary of Changes

Hello @ShaharNaveh, I'm Gemini Code Assist1! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request focuses on updating and improving the tomllib module within the standard library. The primary goal is to enhance the module's type annotations for better static analysis and maintainability, alongside refining its test suite to be more reliable and robust across different Python environments.

Highlights

  • Type Hinting Enhancements: I've refined numerous type annotations across Lib/tomllib/_parser.py and Lib/tomllib/_re.py. This includes making dictionary and list types more explicit (e.g., dict[str, Any], list[Any]) and specifying the string type for re.Match objects (e.g., re.Match[str]). These changes improve code clarity and enable more precise static analysis.
  • Stricter Type Checking Configuration: A new mypy.ini configuration file has been added to Lib/tomllib/, enabling strict type checking for the tomllib module. This includes setting strict = True and other rigorous MyPy options, formalizing the commitment to high type correctness standards.
  • Improved Recursion Limit Tests: The recursion limit tests in Lib/test/test_tomllib/test_misc.py have been made more robust. They now utilize test.support.infinite_recursion and dynamically calculate nest_count based on available recursion depth, making them less brittle and providing better diagnostic information on test failures.
  • Test Suite Consistency: A minor adjustment was made to relative imports in Lib/test/test_tomllib/__main__.py to ensure consistency within the test suite's module resolution.
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Code Review

The pull request updates the tomllib library, focusing on type safety and test robustness. Type hints have been improved, and a mypy.ini file has been added for strict checking. The recursion limit tests have been refactored for better reliability. The changes enhance the overall quality and maintainability of the code.

@@ -142,7 +142,7 @@ class Flags:
EXPLICIT_NEST = 1

def __init__(self) -> None:
self._flags: dict[str, dict] = {}
self._flags: dict[str, dict[Any, Any]] = {}

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medium

Consider using typing.TypedDict for more explicit type safety, especially since the keys in this dictionary are known and fixed. This can help catch errors during development.[^1]

from typing import Any, TypedDict

class FlagsDict(TypedDict):
    flags: set[int]
    recursive_flags: set[int]
    nested: dict[str, Any]

    _flags: dict[str, FlagsDict] = {}

@@ -210,7 +210,7 @@ def get_or_create_nest(
cont = cont[-1]
if not isinstance(cont, dict):
raise KeyError("There is no nest behind this key")
return cont
return cont # type: ignore[no-any-return]

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medium

The type ignore here might hide potential type errors. It would be better to ensure that the return type is always a dict[str, Any] or refactor the code to handle other return types explicitly. Consider adding a check to ensure that cont is indeed a dictionary before returning it, and raise a more informative error if it is not.[^1]

if not isinstance(cont, dict):
    raise TypeError("Expected a dictionary, but got {type(cont)}")
return cont

@youknowone youknowone merged commit 3c7ec04 into RustPython:main Jul 4, 2025
22 of 23 checks passed
@ShaharNaveh ShaharNaveh deleted the update-tomllib branch July 5, 2025 07:21
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2 participants