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erictraut
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Aug 18, 2025
- Made implicitImports and filteredImplicitImports fields of ImportResult optional to eliminate the need to create empty maps.
- Avoided creating a new diagnostic rule set for every source file unless it overrides the default rule set.
- Limited memoization of file and web URIs; we were previously allocating and caching an unlimited number of URIs which consumed 100's of Mb of space on large project.
- Changed tokenizer to forcibly clone the value of a string literal so we don't retain a reference to the entire file's text contents.
* Made implicitImports and filteredImplicitImports fields of ImportResult optional to eliminate the need to create empty maps. * Avoided creating a new diagnostic rule set for every source file unless it overrides the default rule set. * Limited memoization of file and web URIs; we were previously allocating and caching an unlimited number of URIs which consumed 100's of Mb of space on large project. * Changed tokenizer to forcibly clone the value of a string literal so we don't retain a reference to the entire file's text contents.
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@rchiodo, this change should significantly reduce the likelihood of heap exhaustion on large projects (e.g. monorepos). After doing a bunch of memory profiling, I found that |
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Diff from mypy_primer, showing the effect of this PR on open source code: sympy (https://github.com/sympy/sympy)
+ .../projects/sympy/sympy/solvers/ode/ode.py:609:22 - error: Cannot access attribute "pop" for class "tuple[()]"
+ Attribute "pop" is unknown (reportAttributeAccessIssue)
+ .../projects/sympy/sympy/solvers/ode/ode.py:609:22 - error: Cannot access attribute "pop" for class "tuple[str, ...]"
+ Attribute "pop" is unknown (reportAttributeAccessIssue)
+ .../projects/sympy/sympy/solvers/ode/ode.py:1515:38 - error: Object of type "None" is not subscriptable (reportOptionalSubscript)
+ .../projects/sympy/sympy/solvers/ode/ode.py:1516:38 - error: Object of type "None" is not subscriptable (reportOptionalSubscript)
+ .../projects/sympy/sympy/solvers/ode/ode.py:1526:9 - error: No overloads for "update" match the provided arguments (reportCallIssue)
+ .../projects/sympy/sympy/solvers/ode/ode.py:1526:12 - error: "update" is not a known attribute of "None" (reportOptionalMemberAccess)
+ .../projects/sympy/sympy/solvers/ode/ode.py:1526:19 - error: Argument of type "Unknown | dict[Unknown, Unknown] | None" cannot be assigned to parameter "m" of type "Iterable[tuple[str, Unknown]]" in function "update"
+ Type "Unknown | dict[Unknown, Unknown] | None" is not assignable to type "Iterable[tuple[str, Unknown]]"
+ "None" is incompatible with protocol "Iterable[tuple[str, Unknown]]"
+ "__iter__" is not present (reportArgumentType)
+ .../projects/sympy/sympy/solvers/ode/ode.py:1533:43 - error: Object of type "None" is not subscriptable (reportOptionalSubscript)
+ .../projects/sympy/sympy/solvers/ode/ode.py:1533:64 - error: Object of type "None" is not subscriptable (reportOptionalSubscript)
+ .../projects/sympy/sympy/solvers/ode/ode.py:1539:9 - error: No overloads for "update" match the provided arguments (reportCallIssue)
+ .../projects/sympy/sympy/solvers/ode/ode.py:1539:12 - error: "update" is not a known attribute of "None" (reportOptionalMemberAccess)
+ .../projects/sympy/sympy/solvers/ode/ode.py:1539:19 - error: Argument of type "Unknown | dict[Unknown, Unknown] | None" cannot be assigned to parameter "m" of type "Iterable[tuple[str, Unknown]]" in function "update"
+ Type "Unknown | dict[Unknown, Unknown] | None" is not assignable to type "Iterable[tuple[str, Unknown]]"
+ "None" is incompatible with protocol "Iterable[tuple[str, Unknown]]"
+ "__iter__" is not present (reportArgumentType)
+ .../projects/sympy/sympy/solvers/ode/ode.py:1546:43 - error: Object of type "None" is not subscriptable (reportOptionalSubscript)
+ .../projects/sympy/sympy/solvers/ode/ode.py:1546:74 - error: Object of type "None" is not subscriptable (reportOptionalSubscript)
+ .../projects/sympy/sympy/solvers/ode/ode.py:1552:9 - error: No overloads for "update" match the provided arguments (reportCallIssue)
+ .../projects/sympy/sympy/solvers/ode/ode.py:1552:12 - error: "update" is not a known attribute of "None" (reportOptionalMemberAccess)
+ .../projects/sympy/sympy/solvers/ode/ode.py:1552:19 - error: Argument of type "Unknown | dict[Unknown, Unknown] | None" cannot be assigned to parameter "m" of type "Iterable[tuple[str, Unknown]]" in function "update"
+ Type "Unknown | dict[Unknown, Unknown] | None" is not assignable to type "Iterable[tuple[str, Unknown]]"
+ "None" is incompatible with protocol "Iterable[tuple[str, Unknown]]"
+ "__iter__" is not present (reportArgumentType)
+ .../projects/sympy/sympy/solvers/ode/ode.py:1559:49 - error: Object of type "None" is not subscriptable (reportOptionalSubscript)
+ .../projects/sympy/sympy/solvers/ode/ode.py:1559:70 - error: Object of type "None" is not subscriptable (reportOptionalSubscript)
- .../projects/sympy/sympy/solvers/ode/ode.py:1690:36 - error: Cannot access attribute "lhs" for class "Expr"
- Attribute "lhs" is unknown (reportAttributeAccessIssue)
- .../projects/sympy/sympy/solvers/ode/ode.py:1690:55 - error: Cannot access attribute "rhs" for class "Expr"
- Attribute "rhs" is unknown (reportAttributeAccessIssue)
- .../projects/sympy/sympy/solvers/ode/ode.py:1691:36 - error: Cannot access attribute "lhs" for class "Expr"
- Attribute "lhs" is unknown (reportAttributeAccessIssue)
- .../projects/sympy/sympy/solvers/ode/ode.py:1692:17 - error: No overloads for "__setitem__" match the provided arguments (reportCallIssue)
- .../projects/sympy/sympy/solvers/ode/ode.py:1692:17 - error: Argument of type "Equality | BooleanFalse | BooleanTrue | Unknown | Expr" cannot be assigned to parameter "value" of type "Equality | BooleanFalse | BooleanTrue" in function "__setitem__"
- Type "Equality | BooleanFalse | BooleanTrue | Unknown | Expr" is not assignable to type "Equality | BooleanFalse | BooleanTrue"
- Type "Expr" is not assignable to type "Equality | BooleanFalse | BooleanTrue"
- "Expr" is not assignable to "Equality"
- "Expr" is not assignable to "BooleanFalse"
- "Expr" is not assignable to "BooleanTrue" (reportArgumentType)
+ .../projects/sympy/sympy/solvers/ode/ode.py:3379:7 - error: "update" is not a known attribute of "None" (reportOptionalMemberAccess)
+ .../projects/sympy/sympy/solvers/ode/ode.py:3379:38 - error: Object of type "None" is not subscriptable (reportOptionalSubscript)
+ .../projects/sympy/sympy/solvers/ode/ode.py:3380:7 - error: "update" is not a known attribute of "None" (reportOptionalMemberAccess)
+ .../projects/sympy/sympy/solvers/ode/ode.py:3380:38 - error: Object of type "None" is not subscriptable (reportOptionalSubscript)
+ .../projects/sympy/sympy/solvers/ode/ode.py:3381:14 - error: Object of type "None" is not subscriptable (reportOptionalSubscript)
+ .../projects/sympy/sympy/solvers/ode/ode.py:3382:14 - error: Object of type "None" is not subscriptable (reportOptionalSubscript)
+ .../projects/sympy/sympy/solvers/ode/ode.py:3383:14 - error: Object of type "None" is not subscriptable (reportOptionalSubscript)
+ .../projects/sympy/sympy/solvers/ode/ode.py:3395:50 - error: Object of type "None" is not subscriptable (reportOptionalSubscript)
+ .../projects/sympy/sympy/solvers/ode/ode.py:3396:50 - error: Object of type "None" is not subscriptable (reportOptionalSubscript)
+ .../projects/sympy/sympy/solvers/ode/ode.py:3397:50 - error: Object of type "None" is not subscriptable (reportOptionalSubscript)
+ .../projects/sympy/sympy/solvers/ode/ode.py:3437:5 - error: No overloads for "update" match the provided arguments (reportCallIssue)
+ .../projects/sympy/sympy/solvers/ode/ode.py:3437:7 - error: "update" is not a known attribute of "None" (reportOptionalMemberAccess)
+ .../projects/sympy/sympy/solvers/ode/ode.py:3437:14 - error: Argument of type "Unknown | dict[Unknown, Unknown] | None" cannot be assigned to parameter "m" of type "Iterable[tuple[str, Unknown]]" in function "update"
+ Type "Unknown | dict[Unknown, Unknown] | None" is not assignable to type "Iterable[tuple[str, Unknown]]"
+ "None" is incompatible with protocol "Iterable[tuple[str, Unknown]]"
+ "__iter__" is not present (reportArgumentType)
+ .../projects/sympy/sympy/solvers/ode/ode.py:3438:18 - error: Object of type "None" is not subscriptable (reportOptionalSubscript)
+ .../projects/sympy/sympy/solvers/ode/ode.py:3438:43 - error: Object of type "None" is not subscriptable (reportOptionalSubscript)
+ .../projects/sympy/sympy/solvers/ode/ode.py:3439:9 - error: Object of type "None" is not subscriptable (reportOptionalSubscript)
+ .../projects/sympy/sympy/solvers/ode/ode.py:3439:16 - error: Object of type "None" is not subscriptable (reportOptionalSubscript)
+ .../projects/sympy/sympy/solvers/ode/ode.py:3439:24 - error: Object of type "None" is not subscriptable (reportOptionalSubscript)
+ .../projects/sympy/sympy/solvers/ode/ode.py:3439:31 - error: Object of type "None" is not subscriptable (reportOptionalSubscript)
+ .../projects/sympy/sympy/solvers/ode/ode.py:3440:9 - error: Object of type "None" is not subscriptable (reportOptionalSubscript)
+ .../projects/sympy/sympy/solvers/ode/ode.py:3440:15 - error: Object of type "None" is not subscriptable (reportOptionalSubscript)
+ .../projects/sympy/sympy/solvers/ode/ode.py:3440:23 - error: Object of type "None" is not subscriptable (reportOptionalSubscript)
+ .../projects/sympy/sympy/solvers/ode/ode.py:3440:30 - error: Object of type "None" is not subscriptable (reportOptionalSubscript)
+ .../projects/sympy/sympy/solvers/ode/ode.py:3441:7 - error: "update" is not a known attribute of "None" (reportOptionalMemberAccess)
+ .../projects/sympy/sympy/solvers/ode/ode.py:3441:46 - error: Object of type "None" is not subscriptable (reportOptionalSubscript)
+ .../projects/sympy/sympy/solvers/ode/ode.py:3441:54 - error: Object of type "None" is not subscriptable (reportOptionalSubscript)
+ .../projects/sympy/sympy/solvers/ode/ode.py:3442:9 - error: Object of type "None" is not subscriptable (reportOptionalSubscript)
+ .../projects/sympy/sympy/solvers/ode/ode.py:3442:19 - error: Object of type "None" is not subscriptable (reportOptionalSubscript)
+ .../projects/sympy/sympy/solvers/ode/ode.py:3442:29 - error: Object of type "None" is not subscriptable (reportOptionalSubscript)
+ .../projects/sympy/sympy/solvers/ode/ode.py:3443:10 - error: Object of type "None" is not subscriptable (reportOptionalSubscript)
+ .../projects/sympy/sympy/solvers/ode/ode.py:3444:10 - error: Object of type "None" is not subscriptable (reportOptionalSubscript)
+ .../projects/sympy/sympy/solvers/ode/ode.py:3445:10 - error: Object of type "None" is not subscriptable (reportOptionalSubscript)
+ .../projects/sympy/sympy/solvers/ode/ode.py:3496:5 - error: No overloads for "update" match the provided arguments (reportCallIssue)
+ .../projects/sympy/sympy/solvers/ode/ode.py:3496:7 - error: "update" is not a known attribute of "None" (reportOptionalMemberAccess)
... (truncated 1699 lines) ...
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