sequence.index() ⚬ Entries

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sequence.index() ⚬｜Documentation｜1st｜20251021183321-00-⌔

Built-in Types — Python 3 documentation#sequence.index

sequence.index(value[, start[, stop]])

Return the index of the first occurrence of value in sequence.

Raises ValueError if value is not found in sequence.

The start or stop arguments allow for efficient searching of subsections of the sequence, beginning at start and ending at stop. This is roughly equivalent to start + sequence[start:stop].index(value), only without copying any data.

Caution: Not all sequence types support passing the start and stop arguments.

Printed 2026-06-28.

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