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ruff/crates/red_knot_python_semantic/resources/mdtest/expression/boolean.md
David Peter 1feb3cf41a
[red-knot] Use Unknown | T_inferred for undeclared public symbols (#15674) 
## Summary

Use `Unknown | T_inferred` as the type for *undeclared* public symbols.

## Test Plan

- Updated existing tests
- New test for external `__slots__` modifications.
- New tests for external modifications of public symbols.
2025-01-24 12:47:48 +01:00

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Expressions

OR

def _(foo: str):
    reveal_type(True or False)  # revealed: Literal[True]
    reveal_type("x" or "y" or "z")  # revealed: Literal["x"]
    reveal_type("" or "y" or "z")  # revealed: Literal["y"]
    reveal_type(False or "z")  # revealed: Literal["z"]
    reveal_type(False or True)  # revealed: Literal[True]
    reveal_type(False or False)  # revealed: Literal[False]
    reveal_type(foo or False)  # revealed: str & ~AlwaysFalsy | Literal[False]
    reveal_type(foo or True)  # revealed: str & ~AlwaysFalsy | Literal[True]

AND

def _(foo: str):
    reveal_type(True and False)  # revealed: Literal[False]
    reveal_type(False and True)  # revealed: Literal[False]
    reveal_type(foo and False)  # revealed: str & ~AlwaysTruthy | Literal[False]
    reveal_type(foo and True)  # revealed: str & ~AlwaysTruthy | Literal[True]
    reveal_type("x" and "y" and "z")  # revealed: Literal["z"]
    reveal_type("x" and "y" and "")  # revealed: Literal[""]
    reveal_type("" and "y")  # revealed: Literal[""]

Simple function calls to bool

def _(flag: bool):
    if flag:
        x = True
    else:
        x = False

    reveal_type(x)  # revealed: bool

Complex

reveal_type("x" and "y" or "z")  # revealed: Literal["y"]
reveal_type("x" or "y" and "z")  # revealed: Literal["x"]
reveal_type("" and "y" or "z")  # revealed: Literal["z"]
reveal_type("" or "y" and "z")  # revealed: Literal["z"]
reveal_type("x" and "y" or "")  # revealed: Literal["y"]
reveal_type("x" or "y" and "")  # revealed: Literal["x"]

bool() function

Evaluates to builtin

redefined_builtin_bool: type[bool] = bool

def my_bool(x) -> bool:
    return True

from a import redefined_builtin_bool, my_bool

reveal_type(redefined_builtin_bool(0))  # revealed: Literal[False]
reveal_type(my_bool(0))  # revealed: bool

Truthy values

reveal_type(bool(1))  # revealed: Literal[True]
reveal_type(bool((0,)))  # revealed: Literal[True]
reveal_type(bool("NON EMPTY"))  # revealed: Literal[True]
reveal_type(bool(True))  # revealed: Literal[True]

def foo(): ...

reveal_type(bool(foo))  # revealed: Literal[True]

Falsy values

reveal_type(bool(0))  # revealed: Literal[False]
reveal_type(bool(()))  # revealed: Literal[False]
reveal_type(bool(None))  # revealed: Literal[False]
reveal_type(bool(""))  # revealed: Literal[False]
reveal_type(bool(False))  # revealed: Literal[False]
reveal_type(bool())  # revealed: Literal[False]

Ambiguous values

reveal_type(bool([]))  # revealed: bool
reveal_type(bool({}))  # revealed: bool
reveal_type(bool(set()))  # revealed: bool