Python Tuples

A tuple is an ordered collection that cannot change after you create it. t = (3, 4) is a point. t[0] = 9 raises TypeError. No append, no remove. Use it for fixed records and as dict keys when the items are hashable. Syntax is parentheses, or even 1, 2, 3 without them.

One-item trap: (42,) is a tuple. (42) is just the int 42 in brackets. Freshers miss the comma and then wonder why t[0] fails. Interview line: ordered + immutable.

Python Tuples — output — 7. Uncomment assignment and it crashes — tuple cannot change.