The key function in Python is an optional argument used in many built-in functions like sorted(), min(), max(), and bisect_left() to customize how elements are compared.

Both tuples and lists are used to store collections of items, but they have key differences in mutability, performance, and usage.

The zip() function in Python combines multiple iterables (lists, tuples, dictionaries, etc.) element-wise into tuples.

Python 支援多種資料型別，如數字、字串、布林值等。可以用變數來儲存這些資料。