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ruff/crates/red_knot_python_semantic/resources/mdtest/subscript/bytes.md
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[red-knot] Type narrow in else clause (#13918) 
## Summary

Add support for type narrowing in elif and else scopes as part of
#13694.

## Test Plan

- mdtest
- builder unit test for union negation.

---------

Co-authored-by: Carl Meyer <carl@astral.sh>
2024-10-26 16:22:57 +00:00

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Bytes subscript

Simple

b = b"\x00abc\xff"

reveal_type(b[0])  # revealed: Literal[b"\x00"]
reveal_type(b[1])  # revealed: Literal[b"a"]
reveal_type(b[4])  # revealed: Literal[b"\xff"]

reveal_type(b[-1])  # revealed: Literal[b"\xff"]
reveal_type(b[-2])  # revealed: Literal[b"c"]
reveal_type(b[-5])  # revealed: Literal[b"\x00"]

reveal_type(b[False])  # revealed: Literal[b"\x00"]
reveal_type(b[True])  # revealed: Literal[b"a"]

x = b[5]  # error: [index-out-of-bounds] "Index 5 is out of bounds for bytes literal `Literal[b"\x00abc\xff"]` with length 5"
reveal_type(x)  # revealed: Unknown

y = b[-6]  # error: [index-out-of-bounds] "Index -6 is out of bounds for bytes literal `Literal[b"\x00abc\xff"]` with length 5"
reveal_type(y)  # revealed: Unknown

Function return

def int_instance() -> int:
    return 42

a = b"abcde"[int_instance()]
# TODO: Support overloads... Should be `bytes`
reveal_type(a)  # revealed: @Todo