3.3.1 Key–Value Structure
A dictionary stores data as pairs of keys and values.
Each key is used to access its corresponding value.
Dictionary Characteristics
- Keys must be unique
- Keys are immutable data types
- Values can be of any data type
- The dictionary grows dynamically
Common Use Cases
- Storing configuration settings
- Representing objects or records
- Mapping identifiers to values
📌 Note:
Attempting to access a non-existent key results in an error.