Advanced Self-Learning Notes on Python: The Fourth Knowledge Point – Dictionaries
Dictionaries 1. Core Features Format: Composed of key-value pairs, separated by commas, and enclosed in { }. Order: In Python 3.7+, dictionaries maintain insertion order; unordered in 3.6 and earlier. Mutability: Supports adding, deleting, and modifying key-value pairs (the dictionary itself is mutable). 2. Element Rules: Key: Must be an immutable type (e.g., int, str, … Read more