tuple.index() Find index
Last updated: 2026-09-22
tuple.index() Find index
tuple.index(x[, start[, end]]) returns the first index of x; raises ValueError if missing.
| Category | Tuple Methods |
|---|---|
| Kind | Built-in Type Method |
| Python Version | all |
📝 Syntax
tuple.index(x[, start[, end]])⚙️ Parameters
| x Required | The element to search for. |
|---|---|
| start Optional | Start index (inclusive); optional.（Default：0） |
| end Optional | End index (exclusive); None means to the end.（Default：None） |
Returns：int. The first index of x; raises ValueError if not found.
Mutates the original：No (returns a new object)
💥 Raises
ValueError— Raised when x is not in the tuple.
▶ Example
Edit the code, press Run, and see the result in the output panel:
Output：
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❓ FAQ
QWhat happens when the element is not in the tuple?
AA ValueError: tuple.index(x): x not in tuple is raised.
QAre start/end parameters supported?
AYes: t.index(x, start, end) delimits the search range (left-closed, right-open); if not found it still raises ValueError.
QHow do I look up safely?
ACheck with in first: if x in t: i = t.index(x); or catch ValueError with try/except.
