Changed behavior when @final is applied to a method but subsequent …#10578
Merged
Changed behavior when @final is applied to a method but subsequent …#10578
@final is applied to a method but subsequent …#10578Conversation
…decorators (like `@functools.cache` or `@property`) subsequently transform the method into a different type. The typing spec is not clear how this should work. Pyright now honors the `@final` in these cases, which is consistent with mypy. This addresses #10543.
Contributor
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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/stats/tests/test_stochastic_process.py:340:64 - error: Operator "-" not supported for types "Literal[1]" and "Unknown | Any | BernoulliDistribution | Probability | Zero | One | Expr | Float | ComplexInfinity | NaN | Rational | Infinity | NegativeInfinity | _NotImplementedType | tuple[Unknown, ...] | Sum | Piecewise | Basic | Integer | Lambda | Mul | NegativeOne | Number | Integral | Literal[0] | None"
+ .../projects/sympy/sympy/stats/tests/test_stochastic_process.py:340:64 - error: Operator "-" not supported for types "Literal[1]" and "Unknown | Any | BernoulliDistribution | Probability | Zero | One | Expr | Float | ComplexInfinity | NaN | Rational | Infinity | NegativeInfinity | _NotImplementedType | tuple[Unknown, ...] | Sum* | Piecewise | Basic | Sum | Integer | Lambda | Mul | NegativeOne | Number | Integral | Literal[0] | None"
- .../projects/sympy/sympy/stats/tests/test_stochastic_process.py:341:63 - error: Operator "-" not supported for types "Literal[1]" and "Unknown | Any | BernoulliDistribution | Probability | Zero | One | Expr | Float | ComplexInfinity | NaN | Rational | Infinity | NegativeInfinity | _NotImplementedType | tuple[Unknown, ...] | Sum | Piecewise | Basic | Integer | Lambda | Mul | NegativeOne | Number | Integral | Literal[0] | None"
+ .../projects/sympy/sympy/stats/tests/test_stochastic_process.py:341:63 - error: Operator "-" not supported for types "Literal[1]" and "Unknown | Any | BernoulliDistribution | Probability | Zero | One | Expr | Float | ComplexInfinity | NaN | Rational | Infinity | NegativeInfinity | _NotImplementedType | tuple[Unknown, ...] | Sum* | Piecewise | Basic | Sum | Integer | Lambda | Mul | NegativeOne | Number | Integral | Literal[0] | None"
- .../projects/sympy/sympy/stats/tests/test_stochastic_process.py:342:63 - error: Operator "-" not supported for types "Literal[1]" and "Unknown | Any | BernoulliDistribution | Probability | Zero | One | Expr | Float | ComplexInfinity | NaN | Rational | Infinity | NegativeInfinity | _NotImplementedType | tuple[Unknown, ...] | Sum | Piecewise | Basic | Integer | Lambda | Mul | NegativeOne | Number | Integral | Literal[0] | None"
+ .../projects/sympy/sympy/stats/tests/test_stochastic_process.py:342:63 - error: Operator "-" not supported for types "Literal[1]" and "Unknown | Any | BernoulliDistribution | Probability | Zero | One | Expr | Float | ComplexInfinity | NaN | Rational | Infinity | NegativeInfinity | _NotImplementedType | tuple[Unknown, ...] | Sum* | Piecewise | Basic | Sum | Integer | Lambda | Mul | NegativeOne | Number | Integral | Literal[0] | None"
- .../projects/sympy/sympy/stats/tests/test_stochastic_process.py:436:72 - error: Operator "-" not supported for types "Literal[1]" and "Unknown | Any | BernoulliDistribution | Probability | Zero | One | Expr | Float | ComplexInfinity | NaN | Rational | Infinity | NegativeInfinity | _NotImplementedType | tuple[Unknown, ...] | Sum | Piecewise | Basic | Integer | Lambda | Mul | NegativeOne | Number | Integral | Literal[0] | None"
+ .../projects/sympy/sympy/stats/tests/test_stochastic_process.py:436:72 - error: Operator "-" not supported for types "Literal[1]" and "Unknown | Any | BernoulliDistribution | Probability | Zero | One | Expr | Float | ComplexInfinity | NaN | Rational | Infinity | NegativeInfinity | _NotImplementedType | tuple[Unknown, ...] | Sum* | Piecewise | Basic | Sum | Integer | Lambda | Mul | NegativeOne | Number | Integral | Literal[0] | None"
- .../projects/sympy/sympy/stats/tests/test_stochastic_process.py:437:72 - error: Operator "-" not supported for types "Literal[1]" and "Unknown | Any | BernoulliDistribution | Probability | Zero | One | Expr | Float | ComplexInfinity | NaN | Rational | Infinity | NegativeInfinity | _NotImplementedType | tuple[Unknown, ...] | Sum | Piecewise | Basic | Integer | Lambda | Mul | NegativeOne | Number | Integral | Literal[0] | None"
+ .../projects/sympy/sympy/stats/tests/test_stochastic_process.py:437:72 - error: Operator "-" not supported for types "Literal[1]" and "Unknown | Any | BernoulliDistribution | Probability | Zero | One | Expr | Float | ComplexInfinity | NaN | Rational | Infinity | NegativeInfinity | _NotImplementedType | tuple[Unknown, ...] | Sum* | Piecewise | Basic | Sum | Integer | Lambda | Mul | NegativeOne | Number | Integral | Literal[0] | None"
- .../projects/sympy/sympy/stats/tests/test_stochastic_process.py:438:71 - error: Operator "-" not supported for types "Literal[1]" and "Unknown | Any | BernoulliDistribution | Probability | Zero | One | Expr | Float | ComplexInfinity | NaN | Rational | Infinity | NegativeInfinity | _NotImplementedType | tuple[Unknown, ...] | Sum | Piecewise | Basic | Integer | Lambda | Mul | NegativeOne | Number | Integral | Literal[0] | None"
+ .../projects/sympy/sympy/stats/tests/test_stochastic_process.py:438:71 - error: Operator "-" not supported for types "Literal[1]" and "Unknown | Any | BernoulliDistribution | Probability | Zero | One | Expr | Float | ComplexInfinity | NaN | Rational | Infinity | NegativeInfinity | _NotImplementedType | tuple[Unknown, ...] | Sum* | Piecewise | Basic | Sum | Integer | Lambda | Mul | NegativeOne | Number | Integral | Literal[0] | None"
- .../projects/sympy/sympy/stats/tests/test_stochastic_process.py:565:45 - error: Operator "**" not supported for types "Unknown | Any | BernoulliDistribution | Probability | Zero | One | Expr | Float | ComplexInfinity | NaN | Rational | Infinity | NegativeInfinity | _NotImplementedType | tuple[Unknown, ...] | Sum | Piecewise | Basic | Integer | Lambda | Mul | NegativeOne | Number | Integral | Literal[0] | None" and "Literal[4]"
+ .../projects/sympy/sympy/stats/tests/test_stochastic_process.py:565:45 - error: Operator "**" not supported for types "Unknown | Any | BernoulliDistribution | Probability | Zero | One | Expr | Float | ComplexInfinity | NaN | Rational | Infinity | NegativeInfinity | _NotImplementedType | tuple[Unknown, ...] | Sum* | Piecewise | Basic | Sum | Integer | Lambda | Mul | NegativeOne | Number | Integral | Literal[0] | None" and "Literal[4]"
- .../projects/sympy/sympy/stats/tests/test_stochastic_process.py:582:12 - error: Operator "+" not supported for types "Unknown | Any | BernoulliDistribution | Probability | Zero | One | Expr | Float | ComplexInfinity | NaN | Rational | Infinity | NegativeInfinity | _NotImplementedType | tuple[Unknown, ...] | Sum | Piecewise | Basic | Integer | Lambda | Mul | NegativeOne | Number | Integral | Literal[0] | None" and "Unknown | Any | BernoulliDistribution | Probability | Zero | One | Expr | Float | ComplexInfinity | NaN | Rational | Infinity | NegativeInfinity | _NotImplementedType | tuple[Unknown, ...] | Sum | Piecewise | Basic | Integer | Lambda | Mul | NegativeOne | Number | Integral | Literal[0] | None"
+ .../projects/sympy/sympy/stats/tests/test_stochastic_process.py:582:12 - error: Operator "+" not supported for types "Unknown | Any | BernoulliDistribution | Probability | Zero | One | Expr | Float | ComplexInfinity | NaN | Rational | Infinity | NegativeInfinity | _NotImplementedType | tuple[Unknown, ...] | Sum* | Piecewise | Basic | Sum | Integer | Lambda | Mul | NegativeOne | Number | Integral | Literal[0] | None" and "Unknown | Any | BernoulliDistribution | Probability | Zero | One | Expr | Float | ComplexInfinity | NaN | Rational | Infinity | NegativeInfinity | _NotImplementedType | tuple[Unknown, ...] | Sum* | Piecewise | Basic | Sum | Integer | Lambda | Mul | NegativeOne | Number | Integral | Literal[0] | None"
- .../projects/sympy/sympy/stats/tests/test_stochastic_process.py:641:37 - error: Operator "*" not supported for types "Literal[3]" and "Unknown | Any | BernoulliDistribution | Probability | Zero | One | Expr | Float | ComplexInfinity | NaN | Rational | Infinity | NegativeInfinity | _NotImplementedType | tuple[Unknown, ...] | Sum | Piecewise | Basic | Integer | Lambda | Mul | NegativeOne | Number | Integral | Literal[0] | None"
+ .../projects/sympy/sympy/stats/tests/test_stochastic_process.py:641:37 - error: Operator "*" not supported for types "Literal[3]" and "Unknown | Any | BernoulliDistribution | Probability | Zero | One | Expr | Float | ComplexInfinity | NaN | Rational | Infinity | NegativeInfinity | _NotImplementedType | tuple[Unknown, ...] | Sum* | Piecewise | Basic | Sum | Integer | Lambda | Mul | NegativeOne | Number | Integral | Literal[0] | None"
- .../projects/sympy/sympy/stats/tests/test_stochastic_process.py:641:37 - error: Operator "+" not supported for types "Unknown | Any | Expr | One | NegativeOne | Zero | Integer | NaN | ComplexInfinity | Rational | Infinity | NegativeInfinity | Float | Number | int | tuple[Unknown, ...]" and "Unknown | Any | BernoulliDistribution | Probability | Zero | One | Expr | Float | ComplexInfinity | NaN | Rational | Infinity | NegativeInfinity | _NotImplementedType | tuple[Unknown, ...] | Sum | Piecewise | Basic | Integer | Lambda | Mul | NegativeOne | Number | Integral | Literal[0] | None"
+ .../projects/sympy/sympy/stats/tests/test_stochastic_process.py:641:37 - error: Operator "+" not supported for types "Unknown | Any | Expr | One | NegativeOne | Zero | Integer | NaN | ComplexInfinity | Rational | Infinity | NegativeInfinity | Float | Number | int | tuple[Unknown, ...]" and "Unknown | Any | BernoulliDistribution | Probability | Zero | One | Expr | Float | ComplexInfinity | NaN | Rational | Infinity | NegativeInfinity | _NotImplementedType | tuple[Unknown, ...] | Sum* | Piecewise | Basic | Sum | Integer | Lambda | Mul | NegativeOne | Number | Integral | Literal[0] | None"
... (truncated 495 lines) ...
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…decorators (like
@functools.cacheor@property) subsequently transform the method into a different type. The typing spec is not clear how this should work. Pyright now honors the@finalin these cases, which is consistent with mypy. This addresses #10543.