tuples_index_2 error

Tuple index out of range

Detects subscript access on a fixed-length tupleT1, T2, ... parameter where the index is a known integer literal (either an inline int literal or a parameter typed as LiteralN) that falls outside the valid range -len, len-1.

def f(v: tuple[int, str, list[bool]], b: Literal[5]):
    v[b]   # E — index 5 out of range for 3-element tuple
    v[4]   # E — index 4 out of range
    v[-4]  # E — index -4 out of range (valid: -3..-1)

How to handle it

Every rule is on by default — strict is the default, not a cage. You can dial tuples_index_2 down per-file or per-path from your editor or pyproject.toml, or fix the code so it type-checks. See the Type System rules and the complete diagnostic reference.

Canonical URL: https://www.basilisk-python.dev/errors/tuples_index_2