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L2·Control & Collections

🔗Tuples

Immutable ordered sequences — great as keys.

tupleimmutableunpacking

§ 1Immutable = hashable

Tuples of hashables can be dict keys or set members. Lists cannot.

§ 2Unpacking

a, b, c = (1, 2, 3). Star: a, *rest = [1,2,3,4] → rest=[2,3,4].

§ 3One-element tuple

(1,) not (1) — the trailing comma matters.

Example

1point = (3, 4)​
2x, y = point​
3print(x + y)​
4​
5first, *rest = [1,2,3,4,5]​
6print(first, rest)​

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Which is a 1-tuple?
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