Python: Lists vs Tuples

Lists and tuples are both sequences in Python, but they differ in mutability and use.

List – mutable: you can add, remove, or change elements after creation.
- lst = [1, 2, 3]
- lst.append(4) is valid.

Tuple – immutable: once created, you cannot change its contents.
- t = (1, 2, 3)
- t.append(4) would raise an error.

When to use which: Use lists when the collection may change. Use tuples for fixed data (e.g. coordinates, config pairs) and wherever immutability is desired (e.g. as dictionary keys).